diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 183998b..4ff7731 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -46,7 +46,7 @@ jobs:
 
   release:
     if: github.event.release
-    runs-on: [ ${{ matrix.ubuntu-version }}, ${{ matrix.windows }} ]
+    runs-on: [ "${{ matrix.ubuntu-version }}", "${{ matrix.windows }}" ]
 
     strategy:
       fail-fast: false