diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 272016c..a27cb41 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -2,9 +2,9 @@ name: Run PHP Tests and Code Quality Tools
 
 on:
   push:
-    branches: [ master ]
+    branches: [ 5.x ]
   pull_request:
-    branches: [ master ]
+    branches: [ 5.x ]
   schedule:
       # Also run every day at midnight
       - cron: '0 0 * * *'