diff --git a/.github/workflows/integration_test.yml b/.github/workflows/integration_test.yml
index 07fb921b..ffa8f255 100644
--- a/.github/workflows/integration_test.yml
+++ b/.github/workflows/integration_test.yml
@@ -11,7 +11,7 @@ jobs:
       max-parallel: 6
       matrix:
         python-version: [2.7, 3.5, 3.6, 3.7, 3.8]
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [windows-latest]
 
     steps:
     - uses: actions/checkout@v1
diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
index 2a4fcde6..728017c3 100644
--- a/.github/workflows/unittest.yml
+++ b/.github/workflows/unittest.yml
@@ -11,7 +11,7 @@ jobs:
       max-parallel: 12
       matrix:
         python-version: [2.7, 3.5, 3.6, 3.7]  # TODO: 3.8
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [windows-latest]
 
     steps:
     - uses: actions/checkout@v1