diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7432de4b7..68f6aeb3a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -9,9 +9,8 @@ jobs:
   unit:
     strategy:
       matrix:
-        # TODO: add windows-latest
-        os: [ubuntu-latest, macos-latest]
-        python: ['3.6', '3.7', '3.8', '3.9']
+        os: [windows-latest]
+        python: ['3.6']
 
     runs-on: ${{ matrix.os }}
     env: