diff --git a/.github/workflows/poetry-pytest.yml b/.github/workflows/poetry-pytest.yml
index 132bc1d2..9113f668 100644
--- a/.github/workflows/poetry-pytest.yml
+++ b/.github/workflows/poetry-pytest.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       max-parallel: 3
       matrix:
-        python-version: [3.9, 3.10, 3.11]
+        python-version: ["3.9","3.10","3.11"]
     steps:
       #----------------------------------------------
       #       check-out repo and set-up python