diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index e4c0c754..9e2faf2d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -28,7 +28,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [macos-latest]
+        os: [macos-latest, ubuntu-latest]
         r-version: [4.1]
 
     steps: