diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index e2f3e54..2ef7d5d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -9,7 +9,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
 
     - name: Set up Python
       uses: actions/setup-python@v5