diff --git a/.github/workflows/python-test.yml b/.github/workflows/python-test.yml
index 27dacbc..07d0da3 100644
--- a/.github/workflows/python-test.yml
+++ b/.github/workflows/python-test.yml
@@ -8,14 +8,14 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.9.15"
+          python-version: "3.9.1"
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip