diff --git a/.github/workflows/minimum.yml b/.github/workflows/minimum.yml
index be81bd6c..15359b38 100644
--- a/.github/workflows/minimum.yml
+++ b/.github/workflows/minimum.yml
@@ -23,6 +23,8 @@ jobs:
             python-version: '3.11'
           - os: macos-12
             python-version: '3.12'
+          - os: macos-latest
+            python-version: '3.9'
           - os: macos-latest
             python-version: '3.12'
     steps: