diff --git a/{{cookiecutter.package_name}}/.github/workflows/ci.yml b/{{cookiecutter.package_name}}/.github/workflows/ci.yml
index 9c10601..2a379d2 100644
--- a/{{cookiecutter.package_name}}/.github/workflows/ci.yml
+++ b/{{cookiecutter.package_name}}/.github/workflows/ci.yml
@@ -47,7 +47,10 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ {{ cookiecutter.supported_python_versions }} ]
+        python-version:
+        {%- for python_version in cookiecutter.supported_python_versions.split(',') %}
+          - "{{ python_version }}"
+        {%- endfor %}
         os: [ubuntu-latest]
     runs-on: {% raw %}${{ matrix.os }}{% endraw %}
     steps: