diff --git a/.github/workflows/bundle-update.yml b/.github/workflows/bundle-update.yml
index ec78ce19f..3cb5042fc 100644
--- a/.github/workflows/bundle-update.yml
+++ b/.github/workflows/bundle-update.yml
@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/c-check.yml b/.github/workflows/c-check.yml
index 2cc235a62..e75854079 100644
--- a/.github/workflows/c-check.yml
+++ b/.github/workflows/c-check.yml
@@ -9,7 +9,7 @@ jobs:
   format-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.4"
diff --git a/.github/workflows/comments.yml b/.github/workflows/comments.yml
index 7cf414941..74490d47e 100644
--- a/.github/workflows/comments.yml
+++ b/.github/workflows/comments.yml
@@ -13,7 +13,7 @@ jobs:
     # env:
     #   RUBY_COMMIT: 1b0c46daed9186b82ab4fef1a4ab225afe582ee6
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.4.5"
diff --git a/.github/workflows/dependabot.yml b/.github/workflows/dependabot.yml
index d705874b0..7522da417 100644
--- a/.github/workflows/dependabot.yml
+++ b/.github/workflows/dependabot.yml
@@ -17,7 +17,7 @@ jobs:
         uses: dependabot/fetch-metadata@08eff52bf64351f401fb50d4972fa95b9f2c2d1b # v2.4.0
         id: metadata
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - name: Abort if blocker files are changed
diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index e764f887f..d9615d867 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -35,7 +35,7 @@ jobs:
     env:
       RANDOMIZE_STDLIB_TEST_ORDER: "true"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
@@ -76,7 +76,7 @@ jobs:
       matrix:
         ruby: ['3.4', head]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Install dependencies
         run: |
           brew install ruby-build
diff --git a/.github/workflows/typecheck.yml b/.github/workflows/typecheck.yml
index 5f737028a..656c87616 100644
--- a/.github/workflows/typecheck.yml
+++ b/.github/workflows/typecheck.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.3"
diff --git a/.github/workflows/valgrind.yml b/.github/workflows/valgrind.yml
index 082afcdb5..58654f7f6 100644
--- a/.github/workflows/valgrind.yml
+++ b/.github/workflows/valgrind.yml
@@ -19,7 +19,7 @@ jobs:
   valgrind:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.4"
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index fc3aedbad..3bc3dde56 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -15,7 +15,7 @@ jobs:
       matrix:
         ruby: ['3.2', '3.3', ucrt, mswin]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: load ruby
         uses: ruby/setup-ruby@v1
         with: