diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 0f731cd..e8a37ed 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -13,9 +13,7 @@ jobs:
       matrix:
         os: [ubuntu-20.04]
         include:
-        - os: macos-latest
-        - os: ubuntu-latest
-        - os: windows-latest
+        - os: ubuntu-20.04
 
     steps:
     - uses: actions/checkout@v2