diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 8c600d9d..ed0753d2 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
         php: [7.3, 7.4]
         dependency-version: [prefer-lowest, prefer-stable]