diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6c22e6c6c..d1de1810d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -10,7 +10,7 @@ on:
 jobs:
   build_mac:
     name: Build on macOS
-    runs-on: macos-latest
+    runs-on: macos-12
     steps:
       - uses: actions/checkout@v2
       - run: ./unixbuild.sh