diff --git a/.github/workflows/shepherd.yml b/.github/workflows/shepherd.yml
index 6536eab38fb..fb01510787b 100644
--- a/.github/workflows/shepherd.yml
+++ b/.github/workflows/shepherd.yml
@@ -8,6 +8,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - uses: shivammathur/setup-php@2
+      with:
+        php-version: '7.4'
 
     - name: Install dependencies
       run: composer install --prefer-dist --no-progress --no-suggest