diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 28d3416..dc4557c 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -16,10 +16,10 @@ jobs:
         phpunit-versions: ['latest']
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
 
     - name: Setup PHP
-      uses: shivammathur/setup-php@v2
+      uses: shivammathur/setup-php@eb7c497e18156a6bbabfef1d3a82760b9eda3962 # v2
       with:
         php-version: ${{ matrix.php-versions }}
         extensions: mbstring, intl