diff --git a/.github/workflows/phpunit-tests.yml b/.github/workflows/phpunit-tests.yml
index 0c0c1ba..925cd69 100644
--- a/.github/workflows/phpunit-tests.yml
+++ b/.github/workflows/phpunit-tests.yml
@@ -22,7 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         php: ['7.2', '7.4', '8.0', '8.1', '8.2']
-        wp_version: ['5.9', '6.0', '6.1', '6.2', 'master']
+        wp_version: ['5.9', '6.0', '6.1', '6.2', '6.3', 'master']
         include:
           - php: '7.2'
             wp_version: '5.1'