diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5699c922..8b0328b8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
   version-consistency:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Check version consistency
         run: ./test/check-version-consistency.sh