diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index aae7795d7c..0da66e017b 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -281,7 +281,7 @@ jobs:
     needs: changes
     if: github.event_name == 'schedule' || needs.changes.outputs.code == 'true'
 
-    runs-on: macos-latest
+    runs-on: macos-11
     defaults:
       run:
         # https://github.com/conda-incubator/setup-miniconda#use-a-default-shell