diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4c762cb..df5f86d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,7 +3,7 @@ on: [push, pull_request]
 
 jobs:
   build:
-    runs-on: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
     - name: Setup .NET Core