diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index d5217692..f970794d 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -12,7 +12,7 @@ jobs:
     # well on Windows or Mac.  You can convert this to a matrix build if you need
     # cross-platform coverage.
     # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
-    runs-on: ubuntu-latest
+    runs-on: [ubuntu-18.04, macos-10.15, windows-2019]
 
     steps:
     - uses: actions/checkout@v2