diff --git a/.github/workflows/unittests.yml b/.github/workflows/unittests.yml
index 4543663..70eda8a 100644
--- a/.github/workflows/unittests.yml
+++ b/.github/workflows/unittests.yml
@@ -4,10 +4,11 @@ on: [push]
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.9"]
+        os: ["ubuntu-latest", "windows-latest", "macos-latest"]
+        python-version: ["2.7", "3.5", "3.x", "pypy-3.9"]
 
     steps:
       - uses: actions/checkout@v3
@@ -19,6 +20,5 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-      - name: Test with unittests
-        run: |
-          python -m unittest discover
\ No newline at end of file
+      - name: Run unittests
+        run: python -m unittest discover
\ No newline at end of file