diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a9a1c9fa..2656c70f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@0717577d45739eb3c851188b29f50ed6c0b2194e # v2
 
     - name: install elan
       run: |