diff --git a/.github/workflows/python-test_and_lint.yml b/.github/workflows/python-test_and_lint.yml
index a837314..56ac9d4 100644
--- a/.github/workflows/python-test_and_lint.yml
+++ b/.github/workflows/python-test_and_lint.yml
@@ -9,7 +9,7 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix: