diff --git a/.github/workflows/docs-check.yml b/.github/workflows/docs-check.yml
index ed36c77..0b39e30 100644
--- a/.github/workflows/docs-check.yml
+++ b/.github/workflows/docs-check.yml
@@ -32,7 +32,7 @@ jobs:
     name: Markdown Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Ensure markdownlint config
         run: |
@@ -72,7 +72,7 @@ jobs:
     if: ${{ !inputs.skip-vitepress }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - uses: pnpm/action-setup@v4
         with:
@@ -131,7 +131,7 @@ jobs:
     if: ${{ !inputs.skip-link-check }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Check local links
         uses: lycheeverse/lychee-action@v2
diff --git a/.github/workflows/metrics.yml b/.github/workflows/metrics.yml
index a97d78b..c2383d1 100644
--- a/.github/workflows/metrics.yml
+++ b/.github/workflows/metrics.yml
@@ -25,7 +25,7 @@ jobs:
     outputs:
       metrics_json_path: ${{ steps.synth.outputs.path }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/version-sync.yml b/.github/workflows/version-sync.yml
index b4006ea..6804c0d 100644
--- a/.github/workflows/version-sync.yml
+++ b/.github/workflows/version-sync.yml
@@ -17,10 +17,10 @@ jobs:
   version-sync:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Checkout org .github
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           repository: anolishq/.github
           path: _github