diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index ad5ceb2..3436160 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -33,18 +33,20 @@ jobs:
       env: *env
 
   unittest:
-  - uses: actions/checkout@v2
-  - name: Set up Python
-    uses: actions/setup-python@v2
-    with:
-      python-version: '3.9'
-  - name: Test with pytest
-    run: |
-      pip install pytest pytest-cov
-      pytest tests.py --junitxml=results.xml
-  - name: Upload pytest test results
-    uses: actions/upload-artifact@v4
-    with:
-      name: pytest-results
-      path: results.xml
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.9'
+    - name: Test with pytest
+      run: |
+        pip install pytest pytest-cov
+        pytest tests.py --junitxml=results.xml
+    - name: Upload pytest test results
+      uses: actions/upload-artifact@v4
+      with:
+        name: pytest-results
+        path: results.xml
     needs: pre-feature-pipeline