diff --git a/.github/workflows/auto-merge.yaml b/.github/workflows/auto-merge.yaml
index f1f747e..852c900 100644
--- a/.github/workflows/auto-merge.yaml
+++ b/.github/workflows/auto-merge.yaml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout source
-        uses: actions/checkout@v4
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
 
       - name: Create app token
         id: create-app-token