diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index d740c87..ae0d991 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: ['3.6.7', '3.10', '3.12', '3.13']  # Specify the Python versions you want to test