diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 325844b..5d19350 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,10 +8,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
-      - name: Set up Python 3.7
+      - name: Set up Python 3.9
         uses: actions/setup-python@v1
         with:
-          python-version: 3.7
+          python-version: 3.9
       - name: Test code format
         run: |
           pip3 install autopep8