diff --git a/.github/workflows/auto-merge.yml b/.github/workflows/auto-merge.yml
index 7c6dd1fa..d5962c72 100644
--- a/.github/workflows/auto-merge.yml
+++ b/.github/workflows/auto-merge.yml
@@ -13,7 +13,7 @@ jobs:
     # リポジトリオーナーの Pull Request はドラフト以外は自動マージを有効にする
     if: ${{ github.event.pull_request.draft == false && (github.actor == 'dependabot[bot]' || github.repository_owner == github.actor) }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Enable auto-merge for Pull Request
         run: |
diff --git a/.github/workflows/codeql-analysis-dependabot.yml b/.github/workflows/codeql-analysis-dependabot.yml
index abfd6e34..e797f7d1 100644
--- a/.github/workflows/codeql-analysis-dependabot.yml
+++ b/.github/workflows/codeql-analysis-dependabot.yml
@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 2
 
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 514453b8..28336f77 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -25,7 +25,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v4
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 900278ab..2d3d7705 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Use Node.js
       uses: actions/setup-node@v6