diff --git a/.github/workflows/dev.yml b/.github/workflows/dev.yml
index 1bea102..c35bfe4 100644
--- a/.github/workflows/dev.yml
+++ b/.github/workflows/dev.yml
@@ -15,7 +15,7 @@ on:
 jobs:
   # test job includes unit tests and coverage
   pre-commit:
-    runs-on: ubuntu-24.04.01
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v4
         with: { fetch-depth: 0 } # deep clone for setuptools-scm