diff --git a/.github/workflows/integration-tests.yml b/.github/workflows/integration-tests.yml
index e83ddc3..4f6db4c 100644
--- a/.github/workflows/integration-tests.yml
+++ b/.github/workflows/integration-tests.yml
@@ -32,23 +32,17 @@ jobs:
       matrix:
         wp:
           - 'nightly'
+          - '6.4'
           - '6.3'
           - '6.2'
-          - '6.1'
         php:
           - '8.2'
           - '8.1'
           - '8.0'
           - '7.4'
-        dev:
-          - ${{ github.ref_name == 'develop' }}
         include:
           - php: '7.4'
             wp: '5.6'
-        exclude:
-          # Only run the nightly tests on the develop branch.
-          - wp: 'nightly'
-            dev: false
       fail-fast: false
     with:
       wp: ${{ matrix.wp }}
diff --git a/README.md b/README.md
index 24888eb..34a86d6 100644
--- a/README.md
+++ b/README.md
@@ -62,7 +62,7 @@ Not your first time here? See [Recent Changes for Developers](https://github.com
 * **PHP:** 7.4  
   - Tested up to PHP 8.2
 * **WordPress:** 5.6  
-  - Tested up to WP 6.3
+  - Tested up to WP 6.4
 
 ## Installation ##