diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4908e77..cab7452 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
     name: Lint (rustfmt + clippy)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: oxidize-rb/actions/setup-ruby-and-rust@v1
         with:
@@ -55,7 +55,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
         ruby: ${{ fromJSON(needs.ci-data.outputs.result).stable-ruby-versions }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: oxidize-rb/actions/setup-ruby-and-rust@v1
         with:
@@ -93,7 +93,7 @@ jobs:
     needs: ci-data
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: oxidize-rb/actions/setup-ruby-and-rust@v1
         with:
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 33e2347..f728763 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -39,7 +39,7 @@ jobs:
       matrix:
         ruby-platform: ${{ fromJSON(needs.ci-data.outputs.result).supported-ruby-platforms }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: ruby/setup-ruby@v1
         with:
@@ -76,7 +76,7 @@ jobs:
     name: Build source gem
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: oxidize-rb/actions/setup-ruby-and-rust@v1
         with:
@@ -112,7 +112,7 @@ jobs:
     runs-on: ubuntu-latest
     environment: rubygems
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: ruby/setup-ruby@v1
         with: