diff --git a/.github/workflows/cabal-mac-win.yml b/.github/workflows/cabal-mac-win.yml
index 050a997..f16d6d7 100644
--- a/.github/workflows/cabal-mac-win.yml
+++ b/.github/workflows/cabal-mac-win.yml
@@ -89,7 +89,7 @@ jobs:
         echo "ICU_VER=${ICU_VER}" >> "${GITHUB_ENV}"
 
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Setup Haskell
       uses: haskell-actions/setup@v2
diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index 6d1a790..2ad4c7b 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -187,7 +187,7 @@ jobs:
           chmod a+x $HOME/.cabal/bin/cabal-plan
           cabal-plan --version
       - name: checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           path: source
       - name: initial cabal.project for sdist
diff --git a/.github/workflows/stack.yml b/.github/workflows/stack.yml
index a901941..147d944 100644
--- a/.github/workflows/stack.yml
+++ b/.github/workflows/stack.yml
@@ -35,7 +35,7 @@ jobs:
       STACK: stack --no-terminal --resolver ${{ matrix.plan.resolver }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: haskell-actions/setup@v2
       with: