diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a6d6872..4051dc2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2.3.2
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1
         with: