diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 3f81964..5a3d042 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -3,15 +3,18 @@ name: Tests
 on:
   push:
     branches:
-    - master
+      - master
   pull_request:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}-latest
     strategy:
       fail-fast: false
       matrix:
+        os:
+          - ubuntu
+          - windows
         python-version:
         - "3.6"
         - "3.7"