diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1bdc96e..74c9dc5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,7 +24,7 @@ jobs:
           - java: 11
             os: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2.3.4
     - uses: olafurpg/setup-scala@v10
       with:
         java-version: "adopt@1.${{ matrix.java }}"