diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index fc4cb87..bb08a7e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,7 +8,7 @@ jobs:
   tests:
     strategy:
       matrix:
-        os: [ubuntu-18.04, macos]
+        os: [ubuntu-18.04, macos-10.15]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v1