diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
index 021464b6e..86984429f 100644
--- a/.github/workflows/claude.yml
+++ b/.github/workflows/claude.yml
@@ -26,7 +26,7 @@ jobs:
       actions: read # Required for Claude to read CI results on PRs
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 
diff --git a/.github/workflows/dependabot-dedupe.yml b/.github/workflows/dependabot-dedupe.yml
index 5576a188f..5936e5da0 100644
--- a/.github/workflows/dependabot-dedupe.yml
+++ b/.github/workflows/dependabot-dedupe.yml
@@ -14,7 +14,7 @@ jobs:
     if: ${{ github.actor == 'dependabot[bot]' }}
     steps:
       - name: Check out repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.head_ref }}
           fetch-depth: 0
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6c44911bb..a93d0fa99 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,7 +14,7 @@ jobs:
     name: Check workflows
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Download actionlint
         id: download-actionlint
         run: bash <(curl https://raw.githubusercontent.com/rhysd/actionlint/7fdc9630cc360ea1a469eed64ac6d78caeda1234/scripts/download-actionlint.bash) 1.6.25
diff --git a/.github/workflows/publish-preview.yml b/.github/workflows/publish-preview.yml
index c372bf76d..6471c52de 100644
--- a/.github/workflows/publish-preview.yml
+++ b/.github/workflows/publish-preview.yml
@@ -12,7 +12,7 @@ jobs:
     outputs:
       IS_FORK: ${{ steps.is-fork.outputs.IS_FORK }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Determine whether this PR is from a fork
         id: is-fork
         run: echo "IS_FORK=$(gh pr view --json isCrossRepository --jq '.isCrossRepository' "${PR_NUMBER}" )" >> "$GITHUB_OUTPUT"
@@ -29,7 +29,7 @@ jobs:
     if: ${{ needs.is-fork-pull-request.outputs.IS_FORK == 'false' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Check out pull request
         run: gh pr checkout "${PR_NUMBER}"
         env: