diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index d23a05f..b65d4a9 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         os:
-          - "ubuntu-latest"
+          - "ubuntu-20.04"
           - "windows-latest"
           - "macos-latest"
         python-version: