diff --git a/.github/workflows/generate_comment_body_on_review.yml b/.github/workflows/generate_comment_body_on_review.yml
index 6009afab..7e988b07 100644
--- a/.github/workflows/generate_comment_body_on_review.yml
+++ b/.github/workflows/generate_comment_body_on_review.yml
@@ -22,7 +22,7 @@ jobs:
       PR_AUTHOR: ${{ github.event.pull_request.user.login }}
       GH_REPO: ${{ github.repository }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           filter: 'blob:none'
           fetch-depth: 0
diff --git a/.github/workflows/merge_on_comment.yml b/.github/workflows/merge_on_comment.yml
index 95e9b11b..7f1a15c9 100644
--- a/.github/workflows/merge_on_comment.yml
+++ b/.github/workflows/merge_on_comment.yml
@@ -28,7 +28,7 @@ jobs:
       pull-requests: write
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           filter: 'blob:none'
           fetch-depth: 0
diff --git a/.github/workflows/rubocop.yml b/.github/workflows/rubocop.yml
index 766e6488..466baafa 100644
--- a/.github/workflows/rubocop.yml
+++ b/.github/workflows/rubocop.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     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 256149a1..2a86f989 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ruby
@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ruby
@@ -61,7 +61,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ruby
@@ -74,7 +74,7 @@ jobs:
   test_rubocop_yml:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ruby
diff --git a/.github/workflows/welcome_comment.yml b/.github/workflows/welcome_comment.yml
index fdd9b7dd..17fbb5fd 100644
--- a/.github/workflows/welcome_comment.yml
+++ b/.github/workflows/welcome_comment.yml
@@ -20,7 +20,7 @@ jobs:
       PR_NUMBER: ${{ github.event.pull_request.number }}
       GH_REPO: ${{ github.repository }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           filter: 'blob:none'
           fetch-depth: 0