Fix syntax.
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 479fb19..c79db4a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -21,7 +21,6 @@
     steps:
       - name: Checkout code
         uses: actions/checkout@master
-        uses: actions/checkout@v2
         with:
           persist-credentials: false
           submodules: recursive