diff --git a/.github/workflows/test-osx.yml b/.github/workflows/test-osx.yml
index 63f4bab54..64dd16d22 100644
--- a/.github/workflows/test-osx.yml
+++ b/.github/workflows/test-osx.yml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.10]
+        python-version: ['3.10']
         cxx: [clang++]
         std: [c++98, c++11, c++14] # TODO: c++17 is failing !