diff --git a/.github/workflows/bandit-scan.yml b/.github/workflows/bandit-scan.yml
index 2f8055f..68945f8 100644
--- a/.github/workflows/bandit-scan.yml
+++ b/.github/workflows/bandit-scan.yml
@@ -14,7 +14,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       # with:
       #   # For pull requests, check out the base branch, not the PR branch
       #   ref: ${{ github.event.pull_request.base.sha }}
diff --git a/.github/workflows/cicd.yml b/.github/workflows/cicd.yml
index 35ac883..82482b7 100644
--- a/.github/workflows/cicd.yml
+++ b/.github/workflows/cicd.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - name: Install uv
@@ -64,7 +64,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
diff --git a/.github/workflows/deps-review.yml b/.github/workflows/deps-review.yml
index caef89a..d43153f 100644
--- a/.github/workflows/deps-review.yml
+++ b/.github/workflows/deps-review.yml
@@ -9,6 +9,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 'Checkout Repository'
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: 'Dependency Review'
         uses: actions/dependency-review-action@v4
\ No newline at end of file
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 8f69800..ac00067 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -27,7 +27,7 @@ jobs:
     needs: wait-for-ci
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
           fetch-depth: 0
@@ -49,7 +49,7 @@ jobs:
       pull-requests: write # required by rhysd/changelog-from-release
     steps:
       - name: Checkout default branch for changelog
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           ref: ${{ env.DEFAULT_BRANCH }}