diff --git a/packages/google-cloud-recaptcha-enterprise/.flake8 b/packages/google-cloud-recaptcha-enterprise/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-recaptcha-enterprise/.flake8
+++ b/packages/google-cloud-recaptcha-enterprise/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recaptcha-enterprise/CONTRIBUTING.rst b/packages/google-cloud-recaptcha-enterprise/CONTRIBUTING.rst
index f3f59e0970f5..91066d682e7d 100644
--- a/packages/google-cloud-recaptcha-enterprise/CONTRIBUTING.rst
+++ b/packages/google-cloud-recaptcha-enterprise/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-recaptcha-enterprise/MANIFEST.in b/packages/google-cloud-recaptcha-enterprise/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-recaptcha-enterprise/MANIFEST.in
+++ b/packages/google-cloud-recaptcha-enterprise/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recaptcha-enterprise/docs/conf.py b/packages/google-cloud-recaptcha-enterprise/docs/conf.py
index 09077dd6cd9f..e322d6042b53 100644
--- a/packages/google-cloud-recaptcha-enterprise/docs/conf.py
+++ b/packages/google-cloud-recaptcha-enterprise/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recaptcha-enterprise/noxfile.py b/packages/google-cloud-recaptcha-enterprise/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-recaptcha-enterprise/noxfile.py
+++ b/packages/google-cloud-recaptcha-enterprise/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-recaptcha-enterprise/scripts/decrypt-secrets.sh b/packages/google-cloud-recaptcha-enterprise/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-recaptcha-enterprise/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-recaptcha-enterprise/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recaptcha-enterprise/setup.py b/packages/google-cloud-recaptcha-enterprise/setup.py
index d3fcf89cf9cf..f0fe48229957 100644
--- a/packages/google-cloud-recaptcha-enterprise/setup.py
+++ b/packages/google-cloud-recaptcha-enterprise/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -84,6 +85,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-recaptcha-enterprise/testing/constraints-3.13.txt b/packages/google-cloud-recaptcha-enterprise/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-recaptcha-enterprise/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-recommendations-ai/.flake8 b/packages/google-cloud-recommendations-ai/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-recommendations-ai/.flake8
+++ b/packages/google-cloud-recommendations-ai/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recommendations-ai/CONTRIBUTING.rst b/packages/google-cloud-recommendations-ai/CONTRIBUTING.rst
index 31cb277ae3bb..4139a3164d50 100644
--- a/packages/google-cloud-recommendations-ai/CONTRIBUTING.rst
+++ b/packages/google-cloud-recommendations-ai/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-recommendations-ai/MANIFEST.in b/packages/google-cloud-recommendations-ai/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-recommendations-ai/MANIFEST.in
+++ b/packages/google-cloud-recommendations-ai/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recommendations-ai/docs/conf.py b/packages/google-cloud-recommendations-ai/docs/conf.py
index cd34abab0fc7..4a6cae9d9553 100644
--- a/packages/google-cloud-recommendations-ai/docs/conf.py
+++ b/packages/google-cloud-recommendations-ai/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/catalog_service/transports/rest.py b/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/catalog_service/transports/rest.py
index 80bc4415064b..4378227f9804 100644
--- a/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/catalog_service/transports/rest.py
+++ b/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/catalog_service/transports/rest.py
@@ -47,7 +47,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/prediction_api_key_registry/transports/rest.py b/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/prediction_api_key_registry/transports/rest.py
index d7cfa474cdae..bc9c34970b52 100644
--- a/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/prediction_api_key_registry/transports/rest.py
+++ b/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/prediction_api_key_registry/transports/rest.py
@@ -44,7 +44,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/prediction_service/transports/rest.py b/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/prediction_service/transports/rest.py
index 9a623dcf53cd..c558589bb0e1 100644
--- a/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/prediction_service/transports/rest.py
+++ b/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/prediction_service/transports/rest.py
@@ -41,7 +41,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/user_event_service/transports/rest.py b/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/user_event_service/transports/rest.py
index 739cda19f572..e060f959e61b 100644
--- a/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/user_event_service/transports/rest.py
+++ b/packages/google-cloud-recommendations-ai/google/cloud/recommendationengine_v1beta1/services/user_event_service/transports/rest.py
@@ -45,7 +45,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-recommendations-ai/noxfile.py b/packages/google-cloud-recommendations-ai/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-recommendations-ai/noxfile.py
+++ b/packages/google-cloud-recommendations-ai/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-recommendations-ai/scripts/decrypt-secrets.sh b/packages/google-cloud-recommendations-ai/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-recommendations-ai/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-recommendations-ai/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recommendations-ai/setup.py b/packages/google-cloud-recommendations-ai/setup.py
index 6f10e106d140..35a7762ea0ad 100644
--- a/packages/google-cloud-recommendations-ai/setup.py
+++ b/packages/google-cloud-recommendations-ai/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -84,6 +85,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-recommendations-ai/testing/constraints-3.13.txt b/packages/google-cloud-recommendations-ai/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-recommendations-ai/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-recommender/.flake8 b/packages/google-cloud-recommender/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-recommender/.flake8
+++ b/packages/google-cloud-recommender/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recommender/CONTRIBUTING.rst b/packages/google-cloud-recommender/CONTRIBUTING.rst
index d6b4b4bbed0d..cdad7fcc2a5e 100644
--- a/packages/google-cloud-recommender/CONTRIBUTING.rst
+++ b/packages/google-cloud-recommender/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-recommender/MANIFEST.in b/packages/google-cloud-recommender/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-recommender/MANIFEST.in
+++ b/packages/google-cloud-recommender/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recommender/docs/conf.py b/packages/google-cloud-recommender/docs/conf.py
index 46798e0c031c..e70b476f08b7 100644
--- a/packages/google-cloud-recommender/docs/conf.py
+++ b/packages/google-cloud-recommender/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recommender/google/cloud/recommender_v1/services/recommender/transports/rest.py b/packages/google-cloud-recommender/google/cloud/recommender_v1/services/recommender/transports/rest.py
index aa826aee6590..d72350cbb6eb 100644
--- a/packages/google-cloud-recommender/google/cloud/recommender_v1/services/recommender/transports/rest.py
+++ b/packages/google-cloud-recommender/google/cloud/recommender_v1/services/recommender/transports/rest.py
@@ -51,7 +51,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-recommender/google/cloud/recommender_v1beta1/services/recommender/transports/rest.py b/packages/google-cloud-recommender/google/cloud/recommender_v1beta1/services/recommender/transports/rest.py
index 43ef2e70e500..67ca1b6a737f 100644
--- a/packages/google-cloud-recommender/google/cloud/recommender_v1beta1/services/recommender/transports/rest.py
+++ b/packages/google-cloud-recommender/google/cloud/recommender_v1beta1/services/recommender/transports/rest.py
@@ -51,7 +51,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-recommender/noxfile.py b/packages/google-cloud-recommender/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-recommender/noxfile.py
+++ b/packages/google-cloud-recommender/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-recommender/scripts/decrypt-secrets.sh b/packages/google-cloud-recommender/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-recommender/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-recommender/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-recommender/setup.py b/packages/google-cloud-recommender/setup.py
index bdf342d5fef7..2b5c1af73b83 100644
--- a/packages/google-cloud-recommender/setup.py
+++ b/packages/google-cloud-recommender/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -84,6 +85,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-recommender/testing/constraints-3.13.txt b/packages/google-cloud-recommender/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-recommender/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-redis-cluster/.flake8 b/packages/google-cloud-redis-cluster/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-redis-cluster/.flake8
+++ b/packages/google-cloud-redis-cluster/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-redis-cluster/CONTRIBUTING.rst b/packages/google-cloud-redis-cluster/CONTRIBUTING.rst
index a20c2ba4c808..ee7092368230 100644
--- a/packages/google-cloud-redis-cluster/CONTRIBUTING.rst
+++ b/packages/google-cloud-redis-cluster/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-redis-cluster/MANIFEST.in b/packages/google-cloud-redis-cluster/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-redis-cluster/MANIFEST.in
+++ b/packages/google-cloud-redis-cluster/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-redis-cluster/docs/conf.py b/packages/google-cloud-redis-cluster/docs/conf.py
index 2a2c9977d44b..d24d4ad0ec01 100644
--- a/packages/google-cloud-redis-cluster/docs/conf.py
+++ b/packages/google-cloud-redis-cluster/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-redis-cluster/google/cloud/redis_cluster_v1/services/cloud_redis_cluster/transports/rest.py b/packages/google-cloud-redis-cluster/google/cloud/redis_cluster_v1/services/cloud_redis_cluster/transports/rest.py
index a8df3f39e973..1c0659689366 100644
--- a/packages/google-cloud-redis-cluster/google/cloud/redis_cluster_v1/services/cloud_redis_cluster/transports/rest.py
+++ b/packages/google-cloud-redis-cluster/google/cloud/redis_cluster_v1/services/cloud_redis_cluster/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-redis-cluster/google/cloud/redis_cluster_v1beta1/services/cloud_redis_cluster/transports/rest.py b/packages/google-cloud-redis-cluster/google/cloud/redis_cluster_v1beta1/services/cloud_redis_cluster/transports/rest.py
index 51083fe2ac86..a86975b08c8f 100644
--- a/packages/google-cloud-redis-cluster/google/cloud/redis_cluster_v1beta1/services/cloud_redis_cluster/transports/rest.py
+++ b/packages/google-cloud-redis-cluster/google/cloud/redis_cluster_v1beta1/services/cloud_redis_cluster/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-redis-cluster/noxfile.py b/packages/google-cloud-redis-cluster/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-redis-cluster/noxfile.py
+++ b/packages/google-cloud-redis-cluster/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-redis-cluster/scripts/decrypt-secrets.sh b/packages/google-cloud-redis-cluster/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-redis-cluster/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-redis-cluster/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-redis-cluster/setup.py b/packages/google-cloud-redis-cluster/setup.py
index 2a3336927507..4eddefc4957e 100644
--- a/packages/google-cloud-redis-cluster/setup.py
+++ b/packages/google-cloud-redis-cluster/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -84,6 +85,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-redis-cluster/testing/constraints-3.13.txt b/packages/google-cloud-redis-cluster/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-redis-cluster/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-redis/.flake8 b/packages/google-cloud-redis/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-redis/.flake8
+++ b/packages/google-cloud-redis/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-redis/CONTRIBUTING.rst b/packages/google-cloud-redis/CONTRIBUTING.rst
index e2098a0a9b83..30464aad4db3 100644
--- a/packages/google-cloud-redis/CONTRIBUTING.rst
+++ b/packages/google-cloud-redis/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-redis/MANIFEST.in b/packages/google-cloud-redis/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-redis/MANIFEST.in
+++ b/packages/google-cloud-redis/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-redis/docs/conf.py b/packages/google-cloud-redis/docs/conf.py
index 4802736c2b45..a22cca4622e9 100644
--- a/packages/google-cloud-redis/docs/conf.py
+++ b/packages/google-cloud-redis/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-redis/google/cloud/redis_v1/services/cloud_redis/transports/rest.py b/packages/google-cloud-redis/google/cloud/redis_v1/services/cloud_redis/transports/rest.py
index 6aa6bdb221e5..004b3a441adc 100644
--- a/packages/google-cloud-redis/google/cloud/redis_v1/services/cloud_redis/transports/rest.py
+++ b/packages/google-cloud-redis/google/cloud/redis_v1/services/cloud_redis/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-redis/google/cloud/redis_v1beta1/services/cloud_redis/transports/rest.py b/packages/google-cloud-redis/google/cloud/redis_v1beta1/services/cloud_redis/transports/rest.py
index 6854beb9973e..c149776eb342 100644
--- a/packages/google-cloud-redis/google/cloud/redis_v1beta1/services/cloud_redis/transports/rest.py
+++ b/packages/google-cloud-redis/google/cloud/redis_v1beta1/services/cloud_redis/transports/rest.py
@@ -42,7 +42,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-redis/noxfile.py b/packages/google-cloud-redis/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-redis/noxfile.py
+++ b/packages/google-cloud-redis/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-redis/scripts/decrypt-secrets.sh b/packages/google-cloud-redis/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-redis/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-redis/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-redis/setup.py b/packages/google-cloud-redis/setup.py
index 264752c1ca33..2806f0f7cf0c 100644
--- a/packages/google-cloud-redis/setup.py
+++ b/packages/google-cloud-redis/setup.py
@@ -44,6 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -82,6 +83,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-redis/testing/constraints-3.13.txt b/packages/google-cloud-redis/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-redis/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-resource-manager/.flake8 b/packages/google-cloud-resource-manager/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-resource-manager/.flake8
+++ b/packages/google-cloud-resource-manager/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-resource-manager/CONTRIBUTING.rst b/packages/google-cloud-resource-manager/CONTRIBUTING.rst
index 275b76218836..0c6931d2d173 100644
--- a/packages/google-cloud-resource-manager/CONTRIBUTING.rst
+++ b/packages/google-cloud-resource-manager/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-resource-manager/MANIFEST.in b/packages/google-cloud-resource-manager/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-resource-manager/MANIFEST.in
+++ b/packages/google-cloud-resource-manager/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-resource-manager/docs/conf.py b/packages/google-cloud-resource-manager/docs/conf.py
index 6a5e9077b2a3..1d95ba4a1030 100644
--- a/packages/google-cloud-resource-manager/docs/conf.py
+++ b/packages/google-cloud-resource-manager/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/folders/transports/rest.py b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/folders/transports/rest.py
index 986cd6a4a523..bbf5ab0b9483 100644
--- a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/folders/transports/rest.py
+++ b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/folders/transports/rest.py
@@ -44,7 +44,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/organizations/transports/rest.py b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/organizations/transports/rest.py
index 26f230cde9d9..bd0543b86776 100644
--- a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/organizations/transports/rest.py
+++ b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/organizations/transports/rest.py
@@ -44,7 +44,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/projects/transports/rest.py b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/projects/transports/rest.py
index 6f2126d31c44..25a24534849d 100644
--- a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/projects/transports/rest.py
+++ b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/projects/transports/rest.py
@@ -44,7 +44,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_bindings/transports/rest.py b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_bindings/transports/rest.py
index 0e619e62dc7f..67d83171cc9f 100644
--- a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_bindings/transports/rest.py
+++ b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_bindings/transports/rest.py
@@ -42,7 +42,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_holds/transports/rest.py b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_holds/transports/rest.py
index a1c96a2e95c9..dd468ff985f1 100644
--- a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_holds/transports/rest.py
+++ b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_holds/transports/rest.py
@@ -42,7 +42,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_keys/transports/rest.py b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_keys/transports/rest.py
index 5ead368963ee..71f15619d2c5 100644
--- a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_keys/transports/rest.py
+++ b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_keys/transports/rest.py
@@ -44,7 +44,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_values/transports/rest.py b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_values/transports/rest.py
index a71b17acd032..543d523f73e4 100644
--- a/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_values/transports/rest.py
+++ b/packages/google-cloud-resource-manager/google/cloud/resourcemanager_v3/services/tag_values/transports/rest.py
@@ -44,7 +44,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-resource-manager/noxfile.py b/packages/google-cloud-resource-manager/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-resource-manager/noxfile.py
+++ b/packages/google-cloud-resource-manager/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-resource-manager/scripts/decrypt-secrets.sh b/packages/google-cloud-resource-manager/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-resource-manager/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-resource-manager/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-resource-manager/setup.py b/packages/google-cloud-resource-manager/setup.py
index 5533f1f277ce..cb4b232baa9e 100644
--- a/packages/google-cloud-resource-manager/setup.py
+++ b/packages/google-cloud-resource-manager/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
@@ -85,6 +86,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-resource-manager/testing/constraints-3.13.txt b/packages/google-cloud-resource-manager/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ad3f0fa58e2d
--- /dev/null
+++ b/packages/google-cloud-resource-manager/testing/constraints-3.13.txt
@@ -0,0 +1,7 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
+grpc-google-iam-v1
diff --git a/packages/google-cloud-resource-settings/.flake8 b/packages/google-cloud-resource-settings/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-resource-settings/.flake8
+++ b/packages/google-cloud-resource-settings/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-resource-settings/CONTRIBUTING.rst b/packages/google-cloud-resource-settings/CONTRIBUTING.rst
index 304a95411506..3edb9f15897b 100644
--- a/packages/google-cloud-resource-settings/CONTRIBUTING.rst
+++ b/packages/google-cloud-resource-settings/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-resource-settings/MANIFEST.in b/packages/google-cloud-resource-settings/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-resource-settings/MANIFEST.in
+++ b/packages/google-cloud-resource-settings/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-resource-settings/docs/conf.py b/packages/google-cloud-resource-settings/docs/conf.py
index c7d82af3fb8a..1651b6dc8325 100644
--- a/packages/google-cloud-resource-settings/docs/conf.py
+++ b/packages/google-cloud-resource-settings/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-resource-settings/google/cloud/resourcesettings_v1/services/resource_settings_service/transports/rest.py b/packages/google-cloud-resource-settings/google/cloud/resourcesettings_v1/services/resource_settings_service/transports/rest.py
index f68b3667fb6c..f5faab470b13 100644
--- a/packages/google-cloud-resource-settings/google/cloud/resourcesettings_v1/services/resource_settings_service/transports/rest.py
+++ b/packages/google-cloud-resource-settings/google/cloud/resourcesettings_v1/services/resource_settings_service/transports/rest.py
@@ -41,7 +41,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-resource-settings/noxfile.py b/packages/google-cloud-resource-settings/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-resource-settings/noxfile.py
+++ b/packages/google-cloud-resource-settings/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-resource-settings/scripts/decrypt-secrets.sh b/packages/google-cloud-resource-settings/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-resource-settings/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-resource-settings/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-resource-settings/setup.py b/packages/google-cloud-resource-settings/setup.py
index 518eb6a070f3..4bae786b7105 100644
--- a/packages/google-cloud-resource-settings/setup.py
+++ b/packages/google-cloud-resource-settings/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -84,6 +85,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-resource-settings/testing/constraints-3.13.txt b/packages/google-cloud-resource-settings/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-resource-settings/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-retail/.flake8 b/packages/google-cloud-retail/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-retail/.flake8
+++ b/packages/google-cloud-retail/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-retail/CONTRIBUTING.rst b/packages/google-cloud-retail/CONTRIBUTING.rst
index eed5d97012b7..f88a4764b724 100644
--- a/packages/google-cloud-retail/CONTRIBUTING.rst
+++ b/packages/google-cloud-retail/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-retail/MANIFEST.in b/packages/google-cloud-retail/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-retail/MANIFEST.in
+++ b/packages/google-cloud-retail/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-retail/docs/conf.py b/packages/google-cloud-retail/docs/conf.py
index 356e3a803cc1..3bb847dfd121 100644
--- a/packages/google-cloud-retail/docs/conf.py
+++ b/packages/google-cloud-retail/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2/services/analytics_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2/services/analytics_service/transports/rest.py
index da5ba8b2989f..d61deb5b36cf 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2/services/analytics_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2/services/analytics_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2/services/catalog_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2/services/catalog_service/transports/rest.py
index 3121b8064443..03e139c24575 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2/services/catalog_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2/services/catalog_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2/services/completion_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2/services/completion_service/transports/rest.py
index a88b178415ed..de8886e84397 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2/services/completion_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2/services/completion_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2/services/control_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2/services/control_service/transports/rest.py
index 29f6cf5bd448..72cc87de8b89 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2/services/control_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2/services/control_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2/services/generative_question_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2/services/generative_question_service/transports/rest.py
index 5af114642001..7b5973e1e9d8 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2/services/generative_question_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2/services/generative_question_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2/services/model_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2/services/model_service/transports/rest.py
index 9255d6b786ca..3d0a5dc12f09 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2/services/model_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2/services/model_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2/services/prediction_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2/services/prediction_service/transports/rest.py
index 0760606c0574..bf7fff1d00ce 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2/services/prediction_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2/services/prediction_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2/services/product_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2/services/product_service/transports/rest.py
index 93d52a91f418..790d46c69729 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2/services/product_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2/services/product_service/transports/rest.py
@@ -47,7 +47,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2/services/search_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2/services/search_service/transports/rest.py
index 25759ceaf7dd..4999066a6667 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2/services/search_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2/services/search_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2/services/serving_config_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2/services/serving_config_service/transports/rest.py
index 8f38df345d1b..68ea3e710f9c 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2/services/serving_config_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2/services/serving_config_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2/services/user_event_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2/services/user_event_service/transports/rest.py
index 6a923ae65b1a..0d9b71c6ec3b 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2/services/user_event_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2/services/user_event_service/transports/rest.py
@@ -49,7 +49,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/analytics_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/analytics_service/transports/rest.py
index 1a7a7eab81f4..0485606ea30f 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/analytics_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/analytics_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/branch_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/branch_service/transports/rest.py
index 797e54c34a7f..f89f96c01630 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/branch_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/branch_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/catalog_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/catalog_service/transports/rest.py
index 3cbcf9b99662..1214c4675a68 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/catalog_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/catalog_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/completion_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/completion_service/transports/rest.py
index ce5d2cce5350..2a968445dbc4 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/completion_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/completion_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/control_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/control_service/transports/rest.py
index a6d7a6456edd..ad409376f21d 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/control_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/control_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/generative_question_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/generative_question_service/transports/rest.py
index 86dca479530c..baef8a16930f 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/generative_question_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/generative_question_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/merchant_center_account_link_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/merchant_center_account_link_service/transports/rest.py
index af9d9d9ed11f..a1373fc58aad 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/merchant_center_account_link_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/merchant_center_account_link_service/transports/rest.py
@@ -44,7 +44,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/model_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/model_service/transports/rest.py
index 2ae8a43c6dae..00071804a735 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/model_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/model_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/prediction_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/prediction_service/transports/rest.py
index 67fedf61500b..a6a6a8ac6623 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/prediction_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/prediction_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/product_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/product_service/transports/rest.py
index 2a505cd27eee..0db441a1c382 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/product_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/product_service/transports/rest.py
@@ -47,7 +47,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/project_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/project_service/transports/rest.py
index dd214dd2de8d..f93e12a60dad 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/project_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/project_service/transports/rest.py
@@ -45,7 +45,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/search_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/search_service/transports/rest.py
index 96dc608ee8e4..529e0bf6d3e8 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/search_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/search_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/serving_config_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/serving_config_service/transports/rest.py
index bf7eaea289c2..fb306f4328cf 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/serving_config_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/serving_config_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/user_event_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/user_event_service/transports/rest.py
index 4b2600e09e2e..63aab1f8e526 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/user_event_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2alpha/services/user_event_service/transports/rest.py
@@ -50,7 +50,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/analytics_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/analytics_service/transports/rest.py
index 8ef56419f775..6024921d80b4 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/analytics_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/analytics_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/catalog_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/catalog_service/transports/rest.py
index 26b3ab3ffb45..45aa7614bca5 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/catalog_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/catalog_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/completion_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/completion_service/transports/rest.py
index 7effecebb7c7..2a7b6cb407b8 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/completion_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/completion_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/control_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/control_service/transports/rest.py
index 61092164027b..e7be2de69570 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/control_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/control_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/generative_question_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/generative_question_service/transports/rest.py
index e061a74627b0..d6a8a184440d 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/generative_question_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/generative_question_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/model_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/model_service/transports/rest.py
index 9144cc409c99..8e66fd7963f1 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/model_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/model_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/prediction_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/prediction_service/transports/rest.py
index 132d2f4dda64..a600f436e279 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/prediction_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/prediction_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/product_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/product_service/transports/rest.py
index 68943510d197..806d7c76ea10 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/product_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/product_service/transports/rest.py
@@ -47,7 +47,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/project_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/project_service/transports/rest.py
index e1c16e12b7eb..7426e441820e 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/project_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/project_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/search_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/search_service/transports/rest.py
index 1fe3ec7105e5..27bddb1b4edd 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/search_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/search_service/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/serving_config_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/serving_config_service/transports/rest.py
index 63f65e238033..a0afbe610907 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/serving_config_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/serving_config_service/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/user_event_service/transports/rest.py b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/user_event_service/transports/rest.py
index 83986eec0d80..ba0ab9c96faa 100644
--- a/packages/google-cloud-retail/google/cloud/retail_v2beta/services/user_event_service/transports/rest.py
+++ b/packages/google-cloud-retail/google/cloud/retail_v2beta/services/user_event_service/transports/rest.py
@@ -50,7 +50,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-retail/noxfile.py b/packages/google-cloud-retail/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-retail/noxfile.py
+++ b/packages/google-cloud-retail/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-retail/scripts/decrypt-secrets.sh b/packages/google-cloud-retail/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-retail/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-retail/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-retail/setup.py b/packages/google-cloud-retail/setup.py
index e9333c6f110e..dbeefe4d388e 100644
--- a/packages/google-cloud-retail/setup.py
+++ b/packages/google-cloud-retail/setup.py
@@ -44,6 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -82,6 +83,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-retail/testing/constraints-3.13.txt b/packages/google-cloud-retail/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-retail/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-run/.flake8 b/packages/google-cloud-run/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-run/.flake8
+++ b/packages/google-cloud-run/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-run/CONTRIBUTING.rst b/packages/google-cloud-run/CONTRIBUTING.rst
index 82c9fdf2bdcb..3b3245335dee 100644
--- a/packages/google-cloud-run/CONTRIBUTING.rst
+++ b/packages/google-cloud-run/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-run/MANIFEST.in b/packages/google-cloud-run/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-run/MANIFEST.in
+++ b/packages/google-cloud-run/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-run/docs/conf.py b/packages/google-cloud-run/docs/conf.py
index ee5fb8342c0c..4e7574138795 100644
--- a/packages/google-cloud-run/docs/conf.py
+++ b/packages/google-cloud-run/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-run/google/cloud/run_v2/services/builds/transports/rest.py b/packages/google-cloud-run/google/cloud/run_v2/services/builds/transports/rest.py
index e8a435ca9a28..4b16d08247e1 100644
--- a/packages/google-cloud-run/google/cloud/run_v2/services/builds/transports/rest.py
+++ b/packages/google-cloud-run/google/cloud/run_v2/services/builds/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-run/google/cloud/run_v2/services/executions/transports/rest.py b/packages/google-cloud-run/google/cloud/run_v2/services/executions/transports/rest.py
index f57266b521d7..1c2b42f2bc42 100644
--- a/packages/google-cloud-run/google/cloud/run_v2/services/executions/transports/rest.py
+++ b/packages/google-cloud-run/google/cloud/run_v2/services/executions/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-run/google/cloud/run_v2/services/jobs/transports/rest.py b/packages/google-cloud-run/google/cloud/run_v2/services/jobs/transports/rest.py
index 69e4be494c44..9239c89dbe44 100644
--- a/packages/google-cloud-run/google/cloud/run_v2/services/jobs/transports/rest.py
+++ b/packages/google-cloud-run/google/cloud/run_v2/services/jobs/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-run/google/cloud/run_v2/services/revisions/transports/rest.py b/packages/google-cloud-run/google/cloud/run_v2/services/revisions/transports/rest.py
index 4f9cbb9ec6bc..5e2ca971a478 100644
--- a/packages/google-cloud-run/google/cloud/run_v2/services/revisions/transports/rest.py
+++ b/packages/google-cloud-run/google/cloud/run_v2/services/revisions/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-run/google/cloud/run_v2/services/services/transports/rest.py b/packages/google-cloud-run/google/cloud/run_v2/services/services/transports/rest.py
index 3dfd82951f7e..e6435ca85464 100644
--- a/packages/google-cloud-run/google/cloud/run_v2/services/services/transports/rest.py
+++ b/packages/google-cloud-run/google/cloud/run_v2/services/services/transports/rest.py
@@ -46,7 +46,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-run/google/cloud/run_v2/services/tasks/transports/rest.py b/packages/google-cloud-run/google/cloud/run_v2/services/tasks/transports/rest.py
index e146efdc54d9..a9d22e2ac428 100644
--- a/packages/google-cloud-run/google/cloud/run_v2/services/tasks/transports/rest.py
+++ b/packages/google-cloud-run/google/cloud/run_v2/services/tasks/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-run/noxfile.py b/packages/google-cloud-run/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-run/noxfile.py
+++ b/packages/google-cloud-run/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-run/scripts/decrypt-secrets.sh b/packages/google-cloud-run/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-run/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-run/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-run/setup.py b/packages/google-cloud-run/setup.py
index 489de060f25b..a110b1cbca4b 100644
--- a/packages/google-cloud-run/setup.py
+++ b/packages/google-cloud-run/setup.py
@@ -44,6 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
@@ -83,6 +84,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-run/testing/constraints-3.13.txt b/packages/google-cloud-run/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ad3f0fa58e2d
--- /dev/null
+++ b/packages/google-cloud-run/testing/constraints-3.13.txt
@@ -0,0 +1,7 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
+grpc-google-iam-v1
diff --git a/packages/google-cloud-scheduler/.flake8 b/packages/google-cloud-scheduler/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-scheduler/.flake8
+++ b/packages/google-cloud-scheduler/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-scheduler/CONTRIBUTING.rst b/packages/google-cloud-scheduler/CONTRIBUTING.rst
index 0de580ca06fd..2cb4d199a375 100644
--- a/packages/google-cloud-scheduler/CONTRIBUTING.rst
+++ b/packages/google-cloud-scheduler/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-scheduler/MANIFEST.in b/packages/google-cloud-scheduler/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-scheduler/MANIFEST.in
+++ b/packages/google-cloud-scheduler/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-scheduler/docs/conf.py b/packages/google-cloud-scheduler/docs/conf.py
index 6c1278df8ab1..7b889d6d2d1a 100644
--- a/packages/google-cloud-scheduler/docs/conf.py
+++ b/packages/google-cloud-scheduler/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-scheduler/google/cloud/scheduler_v1/services/cloud_scheduler/transports/rest.py b/packages/google-cloud-scheduler/google/cloud/scheduler_v1/services/cloud_scheduler/transports/rest.py
index 5f541afe7028..244503b3c2fa 100644
--- a/packages/google-cloud-scheduler/google/cloud/scheduler_v1/services/cloud_scheduler/transports/rest.py
+++ b/packages/google-cloud-scheduler/google/cloud/scheduler_v1/services/cloud_scheduler/transports/rest.py
@@ -45,7 +45,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-scheduler/google/cloud/scheduler_v1beta1/services/cloud_scheduler/transports/rest.py b/packages/google-cloud-scheduler/google/cloud/scheduler_v1beta1/services/cloud_scheduler/transports/rest.py
index 61bc4a057aba..2b7a72b5cb54 100644
--- a/packages/google-cloud-scheduler/google/cloud/scheduler_v1beta1/services/cloud_scheduler/transports/rest.py
+++ b/packages/google-cloud-scheduler/google/cloud/scheduler_v1beta1/services/cloud_scheduler/transports/rest.py
@@ -45,7 +45,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-scheduler/noxfile.py b/packages/google-cloud-scheduler/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-scheduler/noxfile.py
+++ b/packages/google-cloud-scheduler/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-scheduler/scripts/decrypt-secrets.sh b/packages/google-cloud-scheduler/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-scheduler/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-scheduler/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-scheduler/setup.py b/packages/google-cloud-scheduler/setup.py
index 6e96dc10528b..62d0ee0f4521 100644
--- a/packages/google-cloud-scheduler/setup.py
+++ b/packages/google-cloud-scheduler/setup.py
@@ -44,6 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -82,6 +83,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-scheduler/testing/constraints-3.13.txt b/packages/google-cloud-scheduler/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-scheduler/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-secret-manager/.flake8 b/packages/google-cloud-secret-manager/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-secret-manager/.flake8
+++ b/packages/google-cloud-secret-manager/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-secret-manager/CONTRIBUTING.rst b/packages/google-cloud-secret-manager/CONTRIBUTING.rst
index 204b9784a1d5..01ac9d8e98e2 100644
--- a/packages/google-cloud-secret-manager/CONTRIBUTING.rst
+++ b/packages/google-cloud-secret-manager/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-secret-manager/MANIFEST.in b/packages/google-cloud-secret-manager/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-secret-manager/MANIFEST.in
+++ b/packages/google-cloud-secret-manager/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-secret-manager/docs/conf.py b/packages/google-cloud-secret-manager/docs/conf.py
index 168653531303..41a3a7bb08b7 100644
--- a/packages/google-cloud-secret-manager/docs/conf.py
+++ b/packages/google-cloud-secret-manager/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1/services/secret_manager_service/transports/rest.py b/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1/services/secret_manager_service/transports/rest.py
index 51323737fe09..879d137cfc54 100644
--- a/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1/services/secret_manager_service/transports/rest.py
+++ b/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1/services/secret_manager_service/transports/rest.py
@@ -45,7 +45,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1beta1/services/secret_manager_service/transports/rest.py b/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1beta1/services/secret_manager_service/transports/rest.py
index 7e365607dc76..d92d239f16ca 100644
--- a/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1beta1/services/secret_manager_service/transports/rest.py
+++ b/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1beta1/services/secret_manager_service/transports/rest.py
@@ -44,7 +44,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1beta2/services/secret_manager_service/transports/rest.py b/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1beta2/services/secret_manager_service/transports/rest.py
index 8696f714f77e..edec8f2908c2 100644
--- a/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1beta2/services/secret_manager_service/transports/rest.py
+++ b/packages/google-cloud-secret-manager/google/cloud/secretmanager_v1beta2/services/secret_manager_service/transports/rest.py
@@ -45,7 +45,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-secret-manager/noxfile.py b/packages/google-cloud-secret-manager/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-secret-manager/noxfile.py
+++ b/packages/google-cloud-secret-manager/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-secret-manager/scripts/decrypt-secrets.sh b/packages/google-cloud-secret-manager/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-secret-manager/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-secret-manager/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-secret-manager/setup.py b/packages/google-cloud-secret-manager/setup.py
index 5b12fc68bc7d..65f3dc2826a5 100644
--- a/packages/google-cloud-secret-manager/setup.py
+++ b/packages/google-cloud-secret-manager/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
@@ -85,6 +86,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-secret-manager/testing/constraints-3.13.txt b/packages/google-cloud-secret-manager/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ad3f0fa58e2d
--- /dev/null
+++ b/packages/google-cloud-secret-manager/testing/constraints-3.13.txt
@@ -0,0 +1,7 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
+grpc-google-iam-v1
diff --git a/packages/google-cloud-securesourcemanager/.flake8 b/packages/google-cloud-securesourcemanager/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-securesourcemanager/.flake8
+++ b/packages/google-cloud-securesourcemanager/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securesourcemanager/CONTRIBUTING.rst b/packages/google-cloud-securesourcemanager/CONTRIBUTING.rst
index 7091ecd5e201..46f76a24d312 100644
--- a/packages/google-cloud-securesourcemanager/CONTRIBUTING.rst
+++ b/packages/google-cloud-securesourcemanager/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-securesourcemanager/MANIFEST.in b/packages/google-cloud-securesourcemanager/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-securesourcemanager/MANIFEST.in
+++ b/packages/google-cloud-securesourcemanager/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securesourcemanager/docs/conf.py b/packages/google-cloud-securesourcemanager/docs/conf.py
index 5723eb9e3c2a..038808f1dec3 100644
--- a/packages/google-cloud-securesourcemanager/docs/conf.py
+++ b/packages/google-cloud-securesourcemanager/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager/gapic_version.py b/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager/gapic_version.py
index f8ea948a9c30..558c8aab67c5 100644
--- a/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager/gapic_version.py
+++ b/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "0.1.9"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager_v1/gapic_version.py b/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager_v1/gapic_version.py
index f8ea948a9c30..558c8aab67c5 100644
--- a/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager_v1/gapic_version.py
+++ b/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager_v1/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "0.1.9"  # {x-release-please-version}
+__version__ = "0.0.0"  # {x-release-please-version}
diff --git a/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager_v1/services/secure_source_manager/transports/rest.py b/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager_v1/services/secure_source_manager/transports/rest.py
index fce21877229c..93c180c6b202 100644
--- a/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager_v1/services/secure_source_manager/transports/rest.py
+++ b/packages/google-cloud-securesourcemanager/google/cloud/securesourcemanager_v1/services/secure_source_manager/transports/rest.py
@@ -45,7 +45,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-securesourcemanager/noxfile.py b/packages/google-cloud-securesourcemanager/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-securesourcemanager/noxfile.py
+++ b/packages/google-cloud-securesourcemanager/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-securesourcemanager/samples/generated_samples/snippet_metadata_google.cloud.securesourcemanager.v1.json b/packages/google-cloud-securesourcemanager/samples/generated_samples/snippet_metadata_google.cloud.securesourcemanager.v1.json
index ddcac69d5c74..044f08b47a96 100644
--- a/packages/google-cloud-securesourcemanager/samples/generated_samples/snippet_metadata_google.cloud.securesourcemanager.v1.json
+++ b/packages/google-cloud-securesourcemanager/samples/generated_samples/snippet_metadata_google.cloud.securesourcemanager.v1.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-securesourcemanager",
-    "version": "0.1.9"
+    "version": "0.1.0"
   },
   "snippets": [
     {
diff --git a/packages/google-cloud-securesourcemanager/scripts/decrypt-secrets.sh b/packages/google-cloud-securesourcemanager/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-securesourcemanager/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-securesourcemanager/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securesourcemanager/setup.py b/packages/google-cloud-securesourcemanager/setup.py
index 63bc56f1a9a6..79ffdc683040 100644
--- a/packages/google-cloud-securesourcemanager/setup.py
+++ b/packages/google-cloud-securesourcemanager/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
@@ -85,6 +86,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-securesourcemanager/testing/constraints-3.13.txt b/packages/google-cloud-securesourcemanager/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ad3f0fa58e2d
--- /dev/null
+++ b/packages/google-cloud-securesourcemanager/testing/constraints-3.13.txt
@@ -0,0 +1,7 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
+grpc-google-iam-v1
diff --git a/packages/google-cloud-securitycenter/.flake8 b/packages/google-cloud-securitycenter/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-securitycenter/.flake8
+++ b/packages/google-cloud-securitycenter/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securitycenter/CONTRIBUTING.rst b/packages/google-cloud-securitycenter/CONTRIBUTING.rst
index faafd742aa60..76e49b4d12f2 100644
--- a/packages/google-cloud-securitycenter/CONTRIBUTING.rst
+++ b/packages/google-cloud-securitycenter/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-securitycenter/MANIFEST.in b/packages/google-cloud-securitycenter/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-securitycenter/MANIFEST.in
+++ b/packages/google-cloud-securitycenter/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securitycenter/docs/conf.py b/packages/google-cloud-securitycenter/docs/conf.py
index 217de56d6275..b23283d7a461 100644
--- a/packages/google-cloud-securitycenter/docs/conf.py
+++ b/packages/google-cloud-securitycenter/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1/services/security_center/transports/rest.py b/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1/services/security_center/transports/rest.py
index f5091cb6c044..925061fe92d5 100644
--- a/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1/services/security_center/transports/rest.py
+++ b/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1/services/security_center/transports/rest.py
@@ -79,7 +79,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1beta1/services/security_center/transports/rest.py b/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1beta1/services/security_center/transports/rest.py
index 75a2b1fa92a2..7a2297e35db0 100644
--- a/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1beta1/services/security_center/transports/rest.py
+++ b/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1beta1/services/security_center/transports/rest.py
@@ -55,7 +55,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1p1beta1/services/security_center/transports/rest.py b/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1p1beta1/services/security_center/transports/rest.py
index 10d9af13fcc5..701f310e9931 100644
--- a/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1p1beta1/services/security_center/transports/rest.py
+++ b/packages/google-cloud-securitycenter/google/cloud/securitycenter_v1p1beta1/services/security_center/transports/rest.py
@@ -60,7 +60,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-securitycenter/google/cloud/securitycenter_v2/services/security_center/transports/rest.py b/packages/google-cloud-securitycenter/google/cloud/securitycenter_v2/services/security_center/transports/rest.py
index 124a7dd02c87..dd75418c6be2 100644
--- a/packages/google-cloud-securitycenter/google/cloud/securitycenter_v2/services/security_center/transports/rest.py
+++ b/packages/google-cloud-securitycenter/google/cloud/securitycenter_v2/services/security_center/transports/rest.py
@@ -63,7 +63,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-securitycenter/noxfile.py b/packages/google-cloud-securitycenter/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-securitycenter/noxfile.py
+++ b/packages/google-cloud-securitycenter/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-securitycenter/scripts/decrypt-secrets.sh b/packages/google-cloud-securitycenter/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-securitycenter/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-securitycenter/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securitycenter/setup.py b/packages/google-cloud-securitycenter/setup.py
index 5d2bea270424..d6fdc50d0cc5 100644
--- a/packages/google-cloud-securitycenter/setup.py
+++ b/packages/google-cloud-securitycenter/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
@@ -85,6 +86,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-securitycenter/testing/constraints-3.13.txt b/packages/google-cloud-securitycenter/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ad3f0fa58e2d
--- /dev/null
+++ b/packages/google-cloud-securitycenter/testing/constraints-3.13.txt
@@ -0,0 +1,7 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
+grpc-google-iam-v1
diff --git a/packages/google-cloud-securitycentermanagement/.flake8 b/packages/google-cloud-securitycentermanagement/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-securitycentermanagement/.flake8
+++ b/packages/google-cloud-securitycentermanagement/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securitycentermanagement/CONTRIBUTING.rst b/packages/google-cloud-securitycentermanagement/CONTRIBUTING.rst
index 62f62e711e93..efe9b4151bc5 100644
--- a/packages/google-cloud-securitycentermanagement/CONTRIBUTING.rst
+++ b/packages/google-cloud-securitycentermanagement/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-securitycentermanagement/MANIFEST.in b/packages/google-cloud-securitycentermanagement/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-securitycentermanagement/MANIFEST.in
+++ b/packages/google-cloud-securitycentermanagement/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securitycentermanagement/docs/conf.py b/packages/google-cloud-securitycentermanagement/docs/conf.py
index d79cd1fc678d..21a3dd3231e9 100644
--- a/packages/google-cloud-securitycentermanagement/docs/conf.py
+++ b/packages/google-cloud-securitycentermanagement/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securitycentermanagement/google/cloud/securitycentermanagement_v1/services/security_center_management/transports/rest.py b/packages/google-cloud-securitycentermanagement/google/cloud/securitycentermanagement_v1/services/security_center_management/transports/rest.py
index bd65245ce5f5..1bc8b4496df6 100644
--- a/packages/google-cloud-securitycentermanagement/google/cloud/securitycentermanagement_v1/services/security_center_management/transports/rest.py
+++ b/packages/google-cloud-securitycentermanagement/google/cloud/securitycentermanagement_v1/services/security_center_management/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-securitycentermanagement/noxfile.py b/packages/google-cloud-securitycentermanagement/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-securitycentermanagement/noxfile.py
+++ b/packages/google-cloud-securitycentermanagement/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-securitycentermanagement/scripts/decrypt-secrets.sh b/packages/google-cloud-securitycentermanagement/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-securitycentermanagement/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-securitycentermanagement/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-securitycentermanagement/setup.py b/packages/google-cloud-securitycentermanagement/setup.py
index cd179b0c330c..a372229d21c9 100644
--- a/packages/google-cloud-securitycentermanagement/setup.py
+++ b/packages/google-cloud-securitycentermanagement/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
@@ -85,6 +86,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-securitycentermanagement/testing/constraints-3.13.txt b/packages/google-cloud-securitycentermanagement/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ad3f0fa58e2d
--- /dev/null
+++ b/packages/google-cloud-securitycentermanagement/testing/constraints-3.13.txt
@@ -0,0 +1,7 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
+grpc-google-iam-v1
diff --git a/packages/google-cloud-service-directory/.flake8 b/packages/google-cloud-service-directory/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-service-directory/.flake8
+++ b/packages/google-cloud-service-directory/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-service-directory/CONTRIBUTING.rst b/packages/google-cloud-service-directory/CONTRIBUTING.rst
index 8253404cffba..62f46cc6a9c0 100644
--- a/packages/google-cloud-service-directory/CONTRIBUTING.rst
+++ b/packages/google-cloud-service-directory/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-service-directory/MANIFEST.in b/packages/google-cloud-service-directory/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-service-directory/MANIFEST.in
+++ b/packages/google-cloud-service-directory/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-service-directory/docs/conf.py b/packages/google-cloud-service-directory/docs/conf.py
index c786ce2e77ee..1226bc2842f3 100644
--- a/packages/google-cloud-service-directory/docs/conf.py
+++ b/packages/google-cloud-service-directory/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1/services/lookup_service/transports/rest.py b/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1/services/lookup_service/transports/rest.py
index 491b004192cc..f6039c5035f9 100644
--- a/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1/services/lookup_service/transports/rest.py
+++ b/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1/services/lookup_service/transports/rest.py
@@ -42,7 +42,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1/services/registration_service/transports/rest.py b/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1/services/registration_service/transports/rest.py
index c6ae1e3ba91a..1ad938431e6d 100644
--- a/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1/services/registration_service/transports/rest.py
+++ b/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1/services/registration_service/transports/rest.py
@@ -51,7 +51,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1beta1/services/lookup_service/transports/rest.py b/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1beta1/services/lookup_service/transports/rest.py
index 2d284d2fd562..28012f5d0169 100644
--- a/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1beta1/services/lookup_service/transports/rest.py
+++ b/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1beta1/services/lookup_service/transports/rest.py
@@ -42,7 +42,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1beta1/services/registration_service/transports/rest.py b/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1beta1/services/registration_service/transports/rest.py
index e169790d8209..90a21133ef6f 100644
--- a/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1beta1/services/registration_service/transports/rest.py
+++ b/packages/google-cloud-service-directory/google/cloud/servicedirectory_v1beta1/services/registration_service/transports/rest.py
@@ -51,7 +51,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-service-directory/noxfile.py b/packages/google-cloud-service-directory/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-service-directory/noxfile.py
+++ b/packages/google-cloud-service-directory/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-service-directory/scripts/decrypt-secrets.sh b/packages/google-cloud-service-directory/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-service-directory/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-service-directory/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-service-directory/setup.py b/packages/google-cloud-service-directory/setup.py
index 9b2beac45ea1..38c563e3f54b 100644
--- a/packages/google-cloud-service-directory/setup.py
+++ b/packages/google-cloud-service-directory/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-google-iam-v1 >= 0.12.4, <1.0.0dev",
 ]
@@ -85,6 +86,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-service-directory/testing/constraints-3.13.txt b/packages/google-cloud-service-directory/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ad3f0fa58e2d
--- /dev/null
+++ b/packages/google-cloud-service-directory/testing/constraints-3.13.txt
@@ -0,0 +1,7 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
+grpc-google-iam-v1
diff --git a/packages/google-cloud-servicehealth/.flake8 b/packages/google-cloud-servicehealth/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-servicehealth/.flake8
+++ b/packages/google-cloud-servicehealth/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-servicehealth/CONTRIBUTING.rst b/packages/google-cloud-servicehealth/CONTRIBUTING.rst
index ca863340eaa5..f77d4f30d7e6 100644
--- a/packages/google-cloud-servicehealth/CONTRIBUTING.rst
+++ b/packages/google-cloud-servicehealth/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-servicehealth/MANIFEST.in b/packages/google-cloud-servicehealth/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-servicehealth/MANIFEST.in
+++ b/packages/google-cloud-servicehealth/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-servicehealth/docs/conf.py b/packages/google-cloud-servicehealth/docs/conf.py
index daea0ca749a0..473ff6b96831 100644
--- a/packages/google-cloud-servicehealth/docs/conf.py
+++ b/packages/google-cloud-servicehealth/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-servicehealth/google/cloud/servicehealth_v1/services/service_health/transports/rest.py b/packages/google-cloud-servicehealth/google/cloud/servicehealth_v1/services/service_health/transports/rest.py
index 2ef01198ceda..0cf141bb3fe5 100644
--- a/packages/google-cloud-servicehealth/google/cloud/servicehealth_v1/services/service_health/transports/rest.py
+++ b/packages/google-cloud-servicehealth/google/cloud/servicehealth_v1/services/service_health/transports/rest.py
@@ -42,7 +42,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-servicehealth/noxfile.py b/packages/google-cloud-servicehealth/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-servicehealth/noxfile.py
+++ b/packages/google-cloud-servicehealth/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-servicehealth/scripts/decrypt-secrets.sh b/packages/google-cloud-servicehealth/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-servicehealth/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-servicehealth/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-servicehealth/setup.py b/packages/google-cloud-servicehealth/setup.py
index 96c7b647e4ed..cc52537bb40c 100644
--- a/packages/google-cloud-servicehealth/setup.py
+++ b/packages/google-cloud-servicehealth/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -84,6 +85,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-servicehealth/testing/constraints-3.13.txt b/packages/google-cloud-servicehealth/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-servicehealth/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-shell/.flake8 b/packages/google-cloud-shell/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-shell/.flake8
+++ b/packages/google-cloud-shell/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-shell/CONTRIBUTING.rst b/packages/google-cloud-shell/CONTRIBUTING.rst
index 2dcaa8144357..47de6cc1de37 100644
--- a/packages/google-cloud-shell/CONTRIBUTING.rst
+++ b/packages/google-cloud-shell/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-shell/MANIFEST.in b/packages/google-cloud-shell/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-shell/MANIFEST.in
+++ b/packages/google-cloud-shell/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-shell/docs/conf.py b/packages/google-cloud-shell/docs/conf.py
index 6efefc832e08..9e047ef4efa3 100644
--- a/packages/google-cloud-shell/docs/conf.py
+++ b/packages/google-cloud-shell/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-shell/google/cloud/shell_v1/services/cloud_shell_service/transports/rest.py b/packages/google-cloud-shell/google/cloud/shell_v1/services/cloud_shell_service/transports/rest.py
index a8b65f306cd4..d4beecf3b210 100644
--- a/packages/google-cloud-shell/google/cloud/shell_v1/services/cloud_shell_service/transports/rest.py
+++ b/packages/google-cloud-shell/google/cloud/shell_v1/services/cloud_shell_service/transports/rest.py
@@ -42,7 +42,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-shell/noxfile.py b/packages/google-cloud-shell/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-shell/noxfile.py
+++ b/packages/google-cloud-shell/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-shell/scripts/decrypt-secrets.sh b/packages/google-cloud-shell/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-shell/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-shell/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-shell/setup.py b/packages/google-cloud-shell/setup.py
index 166119af038a..42de5758bf4a 100644
--- a/packages/google-cloud-shell/setup.py
+++ b/packages/google-cloud-shell/setup.py
@@ -44,6 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -82,6 +83,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-shell/testing/constraints-3.13.txt b/packages/google-cloud-shell/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-shell/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-source-context/.flake8 b/packages/google-cloud-source-context/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-source-context/.flake8
+++ b/packages/google-cloud-source-context/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-source-context/CONTRIBUTING.rst b/packages/google-cloud-source-context/CONTRIBUTING.rst
index 952d4902c61e..1d3802fba679 100644
--- a/packages/google-cloud-source-context/CONTRIBUTING.rst
+++ b/packages/google-cloud-source-context/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-source-context/MANIFEST.in b/packages/google-cloud-source-context/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-source-context/MANIFEST.in
+++ b/packages/google-cloud-source-context/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-source-context/docs/conf.py b/packages/google-cloud-source-context/docs/conf.py
index 6b12bfd41bae..2fdcc55da88d 100644
--- a/packages/google-cloud-source-context/docs/conf.py
+++ b/packages/google-cloud-source-context/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-source-context/noxfile.py b/packages/google-cloud-source-context/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-source-context/noxfile.py
+++ b/packages/google-cloud-source-context/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-source-context/scripts/decrypt-secrets.sh b/packages/google-cloud-source-context/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-source-context/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-source-context/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-source-context/setup.py b/packages/google-cloud-source-context/setup.py
index dd3a12dfeb5f..24e53e36b85b 100644
--- a/packages/google-cloud-source-context/setup.py
+++ b/packages/google-cloud-source-context/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -84,6 +85,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-source-context/testing/constraints-3.13.txt b/packages/google-cloud-source-context/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-source-context/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-speech/.flake8 b/packages/google-cloud-speech/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-speech/.flake8
+++ b/packages/google-cloud-speech/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-speech/CONTRIBUTING.rst b/packages/google-cloud-speech/CONTRIBUTING.rst
index 93bb1b71317b..9fed536710cc 100644
--- a/packages/google-cloud-speech/CONTRIBUTING.rst
+++ b/packages/google-cloud-speech/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-speech/MANIFEST.in b/packages/google-cloud-speech/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-speech/MANIFEST.in
+++ b/packages/google-cloud-speech/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-speech/docs/conf.py b/packages/google-cloud-speech/docs/conf.py
index 8618206826f4..a843c316e7e6 100644
--- a/packages/google-cloud-speech/docs/conf.py
+++ b/packages/google-cloud-speech/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-speech/google/cloud/speech_v1/services/adaptation/transports/rest.py b/packages/google-cloud-speech/google/cloud/speech_v1/services/adaptation/transports/rest.py
index dae908a57160..d5a06d183592 100644
--- a/packages/google-cloud-speech/google/cloud/speech_v1/services/adaptation/transports/rest.py
+++ b/packages/google-cloud-speech/google/cloud/speech_v1/services/adaptation/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-speech/google/cloud/speech_v1/services/speech/transports/rest.py b/packages/google-cloud-speech/google/cloud/speech_v1/services/speech/transports/rest.py
index 82e794f29104..4d78ada7e76e 100644
--- a/packages/google-cloud-speech/google/cloud/speech_v1/services/speech/transports/rest.py
+++ b/packages/google-cloud-speech/google/cloud/speech_v1/services/speech/transports/rest.py
@@ -42,7 +42,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-speech/google/cloud/speech_v1p1beta1/services/adaptation/transports/rest.py b/packages/google-cloud-speech/google/cloud/speech_v1p1beta1/services/adaptation/transports/rest.py
index 351949ac9368..b336587d695f 100644
--- a/packages/google-cloud-speech/google/cloud/speech_v1p1beta1/services/adaptation/transports/rest.py
+++ b/packages/google-cloud-speech/google/cloud/speech_v1p1beta1/services/adaptation/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-speech/google/cloud/speech_v1p1beta1/services/speech/transports/rest.py b/packages/google-cloud-speech/google/cloud/speech_v1p1beta1/services/speech/transports/rest.py
index 4a4d74d9ca8f..6c723b5ab93a 100644
--- a/packages/google-cloud-speech/google/cloud/speech_v1p1beta1/services/speech/transports/rest.py
+++ b/packages/google-cloud-speech/google/cloud/speech_v1p1beta1/services/speech/transports/rest.py
@@ -42,7 +42,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-speech/google/cloud/speech_v2/services/speech/transports/rest.py b/packages/google-cloud-speech/google/cloud/speech_v2/services/speech/transports/rest.py
index 89ecaaf71023..a382d415d307 100644
--- a/packages/google-cloud-speech/google/cloud/speech_v2/services/speech/transports/rest.py
+++ b/packages/google-cloud-speech/google/cloud/speech_v2/services/speech/transports/rest.py
@@ -43,7 +43,7 @@
 DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
     gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
     grpc_version=None,
-    rest_version=requests_version,
+    rest_version=f"requests@{requests_version}",
 )
 
 
diff --git a/packages/google-cloud-speech/noxfile.py b/packages/google-cloud-speech/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-speech/noxfile.py
+++ b/packages/google-cloud-speech/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-speech/scripts/decrypt-secrets.sh b/packages/google-cloud-speech/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-speech/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-speech/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-speech/setup.py b/packages/google-cloud-speech/setup.py
index 3ff081278263..21d03f396f3d 100644
--- a/packages/google-cloud-speech/setup.py
+++ b/packages/google-cloud-speech/setup.py
@@ -44,6 +44,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -82,6 +83,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-speech/testing/constraints-3.13.txt b/packages/google-cloud-speech/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-speech/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf
diff --git a/packages/google-cloud-storage-control/.flake8 b/packages/google-cloud-storage-control/.flake8
index 87f6e408c47d..32986c79287a 100644
--- a/packages/google-cloud-storage-control/.flake8
+++ b/packages/google-cloud-storage-control/.flake8
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-storage-control/CONTRIBUTING.rst b/packages/google-cloud-storage-control/CONTRIBUTING.rst
index 0822ff166a5a..bc84211366b2 100644
--- a/packages/google-cloud-storage-control/CONTRIBUTING.rst
+++ b/packages/google-cloud-storage-control/CONTRIBUTING.rst
@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.12 -- -k <name of test>
+    $ nox -s unit-3.13 -- -k <name of test>
 
 
   .. note::
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.12 -- -k <name of test>
+   $ nox -s system-3.13 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11 and 3.12.
+      System tests are only configured to run under Python 3.8, 3.9, 3.10, 3.11, 3.12 and 3.13.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
@@ -227,6 +227,7 @@ We support:
 -  `Python 3.10`_
 -  `Python 3.11`_
 -  `Python 3.12`_
+-  `Python 3.13`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
@@ -234,6 +235,7 @@ We support:
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
 .. _Python 3.12: https://docs.python.org/3.12/
+.. _Python 3.13: https://docs.python.org/3.13/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/packages/google-cloud-storage-control/MANIFEST.in b/packages/google-cloud-storage-control/MANIFEST.in
index e0a66705318e..d6814cd60037 100644
--- a/packages/google-cloud-storage-control/MANIFEST.in
+++ b/packages/google-cloud-storage-control/MANIFEST.in
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-storage-control/docs/conf.py b/packages/google-cloud-storage-control/docs/conf.py
index fcec73d0f1d6..536da700bc88 100644
--- a/packages/google-cloud-storage-control/docs/conf.py
+++ b/packages/google-cloud-storage-control/docs/conf.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-storage-control/noxfile.py b/packages/google-cloud-storage-control/noxfile.py
index 67b7265f7586..a9ceef47133c 100644
--- a/packages/google-cloud-storage-control/noxfile.py
+++ b/packages/google-cloud-storage-control/noxfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -35,7 +35,15 @@
 
 DEFAULT_PYTHON_VERSION = "3.10"
 
-UNIT_TEST_PYTHON_VERSIONS: List[str] = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+UNIT_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.7",
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "asyncmock",
@@ -49,7 +57,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -168,7 +176,7 @@ def install_unittest_dependencies(session, *constraints):
 def unit(session, protobuf_implementation):
     # Install all test dependencies, then install this package in-place.
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     constraints_path = str(
@@ -368,7 +376,7 @@ def docfx(session):
     )
 
 
-@nox.session(python="3.12")
+@nox.session(python="3.13")
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
@@ -376,7 +384,7 @@ def docfx(session):
 def prerelease_deps(session, protobuf_implementation):
     """Run all tests with prerelease versions of dependencies installed."""
 
-    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12"):
+    if protobuf_implementation == "cpp" and session.python in ("3.11", "3.12", "3.13"):
         session.skip("cpp implementation is not supported in python 3.11+")
 
     # Install all dependencies
diff --git a/packages/google-cloud-storage-control/scripts/decrypt-secrets.sh b/packages/google-cloud-storage-control/scripts/decrypt-secrets.sh
index 0018b421ddf8..120b0ddc4364 100755
--- a/packages/google-cloud-storage-control/scripts/decrypt-secrets.sh
+++ b/packages/google-cloud-storage-control/scripts/decrypt-secrets.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2023 Google LLC All rights reserved.
+# Copyright 2024 Google LLC All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/packages/google-cloud-storage-control/setup.py b/packages/google-cloud-storage-control/setup.py
index a3efb2349646..a119b884e799 100644
--- a/packages/google-cloud-storage-control/setup.py
+++ b/packages/google-cloud-storage-control/setup.py
@@ -46,6 +46,7 @@
     # See https://github.com/googleapis/google-cloud-python/issues/12364
     "google-auth >= 2.14.1, <3.0.0dev,!=2.24.0,!=2.25.0",
     "proto-plus >= 1.22.3, <2.0.0dev",
+    "proto-plus >= 1.25.0, <2.0.0dev; python_version >= '3.13'",
     "protobuf>=3.20.2,<6.0.0dev,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 extras = {}
@@ -84,6 +85,7 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/packages/google-cloud-storage-control/testing/constraints-3.13.txt b/packages/google-cloud-storage-control/testing/constraints-3.13.txt
new file mode 100644
index 000000000000..ed7f9aed2559
--- /dev/null
+++ b/packages/google-cloud-storage-control/testing/constraints-3.13.txt
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-api-core
+proto-plus
+protobuf