diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7de740d..b15bedb 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,7 +11,7 @@ jobs:
     name: Build SDist
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v1
 
     - uses: actions/setup-python@v2
       with: