diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0d84c2f..d3f7848 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,8 +9,8 @@ jobs:
     strategy:
       max-parallel: 2
       matrix:
-        os: [ubuntu-latest, macOS-latest]
-        python-version: ["3.10"]
+        os: [ubuntu-latest, mac-os-12]
+        python-version: ["3.9", "3.10"]
 
     steps:
     - uses: actions/checkout@v1