diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c4cb6b6..18e44e6 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -15,7 +15,12 @@ jobs:
     strategy:
       matrix:
         py: [3.6, 3.7, 3.8, 3.9]
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-latest]
+        include:
+          - os: windows-latest
+            py: 3.9
+          - os: macos-latest
+            py: 3.9
 
     steps:
     - uses: actions/checkout@v2