diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f62cc86c..7ed18f40 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -4,13 +4,12 @@ on: [push, pull_request]
 
 jobs:
   build:
-    # runs-on: ${{ matrix.os }}
-    runs-on: macos-11
+    runs-on: ${{ matrix.os }}
     if: "!contains(github.event.head_commit.message, '[skip ci]')"
     strategy:
       max-parallel: 4
       matrix:
-        # os: [macos-10.15, macos-11]
+        os: [macos-10.15]
         python-version: [3.7, 3.8, 3.9]
 
     steps: