diff --git a/.github/workflows/test-pull-request.yml b/.github/workflows/test-pull-request.yml
index bef60ba..99f48a5 100644
--- a/.github/workflows/test-pull-request.yml
+++ b/.github/workflows/test-pull-request.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: macos-14
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - name: Install dependencies
         run: brew install swiftlint