diff --git a/.github/workflows/test_mac.yml b/.github/workflows/test_mac.yml
index de4aebc5..64c3dfa8 100644
--- a/.github/workflows/test_mac.yml
+++ b/.github/workflows/test_mac.yml
@@ -12,7 +12,7 @@ on:
 
 jobs:
   testMac:
-    runs-on: macos-latest
+    runs-on: macos-13
     steps:
       - name: Python Setup
         uses: actions/setup-python@v5