diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index af5cc2e..8d8c0bc 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -12,7 +12,8 @@ jobs:
     strategy:
       matrix:
         python-version: ["3.8", "3.9", "3.10", "pypy3.8", "pypy3.9"]
-    runs-on: ubuntu-latest
+        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
         with: