diff --git a/.github/workflows/run_pytest.yml b/.github/workflows/run_pytest.yml
index aa6a017..bf2f891 100644
--- a/.github/workflows/run_pytest.yml
+++ b/.github/workflows/run_pytest.yml
@@ -6,9 +6,9 @@ jobs:
   build:
 
     strategy:
-      # max-parallel: 4
+      max-parallel: 3
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-latest]
         python-version: [3.5, 3.6, 3.7]
     runs-on: ${{matrix.os}}
     steps: