diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 8f8e8ce44d93..67a44a323272 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -69,6 +69,7 @@ jobs:
 
     - uses: actions/checkout@v1
       with:
+        ref: v5-develop
         fetch-depth: 1
 
     - name: Copy .env