diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 651df879..8288e8c1 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -16,7 +16,7 @@ jobs:
           - ubuntu-latest
     runs-on: ${{ matrix.runs-on }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index f3dffca7..89cfeceb 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Extract release note
         run: |
           ruby \
@@ -37,7 +37,7 @@ jobs:
       id-token: write
     environment: release
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ruby
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 31dc02a2..42df748c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -27,7 +27,7 @@ jobs:
         #   - runs-on: ubuntu-latest
         #     ruby-version: truffleruby
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
@@ -39,7 +39,7 @@ jobs:
     name: frozen-string-literal
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ruby
@@ -66,7 +66,7 @@ jobs:
           - windows-latest
         ruby-version: ${{ fromJson(needs.ruby-versions-gems.outputs.versions) }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
@@ -95,7 +95,7 @@ jobs:
     name: "Document"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ruby
@@ -105,7 +105,7 @@ jobs:
       - name: Build document
         run: |
           bundle exec rake warning:error rdoc
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         if: |
           github.event_name == 'push'
         with: