diff --git a/.github/workflows/backend.yml b/.github/workflows/backend.yml
index 4283add..af3b515 100644
--- a/.github/workflows/backend.yml
+++ b/.github/workflows/backend.yml
@@ -26,7 +26,7 @@ jobs:
       APP_ENV: test
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
@@ -86,7 +86,7 @@ jobs:
       PHP_VERSION: '8.1'
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2