diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 946ef57..7f271a9 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -30,7 +30,7 @@ jobs:
         python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
         no-coverage: [0]
         include:
-          - os: ubuntu-latest
+          - os: ubuntu-20.04
             python-version: pypy-3.10
             no-coverage: 1
     steps: