diff --git a/.github/workflows/test_pr.yml b/.github/workflows/test_pr.yml
index 6bbcbfec..e3bc5780 100644
--- a/.github/workflows/test_pr.yml
+++ b/.github/workflows/test_pr.yml
@@ -37,7 +37,7 @@ jobs:
     strategy:
       matrix:
         python-version: ["3.10"]
-        os: [macos-latest, ubuntu-latest, windows-latest]
+        os: [macos-11, ubuntu-latest, windows-latest]
     steps:
       - uses: actions/checkout@v2
         with: