diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 19ca701..62df791 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ jobs:
     name: CI
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
 
       - name: Run action
         uses: ./