diff --git a/.github/workflows/build_test_rdplot.yml b/.github/workflows/build_test_rdplot.yml
index 54175cc..a36fe86 100644
--- a/.github/workflows/build_test_rdplot.yml
+++ b/.github/workflows/build_test_rdplot.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.10, 3.11]
+        python-version: ["3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v2