diff --git a/pyproject.toml b/pyproject.toml
index 860dcbf..490a08a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ classifiers = [
 ]
 dependencies = [
     "jsonpath-ng==1.6.1",
-    "prometheus-client==0.20.0",
+    "prometheus-client==0.21.0",
     "pyyaml==6.0.2",
     "requests==2.32.3",
 ]
diff --git a/requirements.txt b/requirements.txt
index 22a99ea..d9bf0f4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ charset-normalizer==3.3.2
 idna==3.10
 jsonpath-ng==1.6.1
 ply==3.11
-prometheus-client==0.20.0
+prometheus-client==0.21.0
 pyyaml==6.0.2
 requests==2.32.3
 urllib3==2.2.3
diff --git a/setup.py b/setup.py
index 7f150a4..8a2af06 100644
--- a/setup.py
+++ b/setup.py
@@ -35,7 +35,7 @@
     packages=find_packages(),
     install_requires=[
         "jsonpath-ng==1.6.1",
-        "prometheus-client==0.20.0",
+        "prometheus-client==0.21.0",
         "pyyaml==6.0.2",
         "requests==2.32.3",
     ],
diff --git a/uv.lock b/uv.lock
index 2ba67c4..03c2187 100644
--- a/uv.lock
+++ b/uv.lock
@@ -149,7 +149,7 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "jsonpath-ng", specifier = "==1.6.1" },
-    { name = "prometheus-client", specifier = "==0.20.0" },
+    { name = "prometheus-client", specifier = "==0.21.0" },
     { name = "pyyaml", specifier = "==6.0.2" },
     { name = "requests", specifier = "==2.32.3" },
 ]
@@ -198,11 +198,11 @@ wheels = [
 
 [[package]]
 name = "prometheus-client"
-version = "0.20.0"
+version = "0.21.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/3d/39/3be07741a33356127c4fe633768ee450422c1231c6d34b951fee1458308d/prometheus_client-0.20.0.tar.gz", hash = "sha256:287629d00b147a32dcb2be0b9df905da599b2d82f80377083ec8463309a4bb89", size = 78278 }
+sdist = { url = "https://files.pythonhosted.org/packages/e1/54/a369868ed7a7f1ea5163030f4fc07d85d22d7a1d270560dab675188fb612/prometheus_client-0.21.0.tar.gz", hash = "sha256:96c83c606b71ff2b0a433c98889d275f51ffec6c5e267de37c7a2b5c9aa9233e", size = 78634 }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/c7/98/745b810d822103adca2df8decd4c0bbe839ba7ad3511af3f0d09692fc0f0/prometheus_client-0.20.0-py3-none-any.whl", hash = "sha256:cde524a85bce83ca359cc837f28b8c0db5cac7aa653a588fd7e84ba061c329e7", size = 54474 },
+    { url = "https://files.pythonhosted.org/packages/84/2d/46ed6436849c2c88228c3111865f44311cff784b4aabcdef4ea2545dbc3d/prometheus_client-0.21.0-py3-none-any.whl", hash = "sha256:4fa6b4dd0ac16d58bb587c04b1caae65b8c5043e85f778f42f5f632f6af2e166", size = 54686 },
 ]
 
 [[package]]