diff --git a/.github/workflows/auto-triage.yml b/.github/workflows/auto-triage.yml
index f54c40d..07bcadc 100644
--- a/.github/workflows/auto-triage.yml
+++ b/.github/workflows/auto-triage.yml
@@ -58,7 +58,7 @@ jobs:
       ISSUE_BODY: ${{ github.event.issue.body }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
index 7bd48a7..61ba3f5 100644
--- a/.github/workflows/claude.yml
+++ b/.github/workflows/claude.yml
@@ -33,7 +33,7 @@ jobs:
       actions: read
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 1