diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index 06ae1da..84eb5b0 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -152,7 +152,7 @@ jobs:
           path: ~/.haskell-ci-tools
 
       - name: checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v6.0.2
         with:
           path: source