diff --git a/.github/workflows/build-site.yml b/.github/workflows/build-site.yml
index 7fd3dceb..d23c695b 100644
--- a/.github/workflows/build-site.yml
+++ b/.github/workflows/build-site.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Fetch main
         run: |
diff --git a/.github/workflows/deploy-gh-pages.yml b/.github/workflows/deploy-gh-pages.yml
index 2d2d7b5a..e9d91a46 100644
--- a/.github/workflows/deploy-gh-pages.yml
+++ b/.github/workflows/deploy-gh-pages.yml
@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
diff --git a/.github/workflows/linkcheck.yml b/.github/workflows/linkcheck.yml
index c3f5a38f..db17f031 100644
--- a/.github/workflows/linkcheck.yml
+++ b/.github/workflows/linkcheck.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Fetch main
         run: |
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c8936bab..e96f467d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,7 +11,7 @@ jobs:
     name: Action lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Check workflow files
         run: |
           bash <(curl https://raw.githubusercontent.com/rhysd/actionlint/main/scripts/download-actionlint.bash)
diff --git a/.github/workflows/update-all-review-data.yml b/.github/workflows/update-all-review-data.yml
index 9fdd4399..1f8ecf08 100644
--- a/.github/workflows/update-all-review-data.yml
+++ b/.github/workflows/update-all-review-data.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
diff --git a/.github/workflows/update-contribs-reviews.yml b/.github/workflows/update-contribs-reviews.yml
index 6957bbbb..ce82451f 100644
--- a/.github/workflows/update-contribs-reviews.yml
+++ b/.github/workflows/update-contribs-reviews.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Setup Python
         uses: actions/setup-python@v5
         with: