diff --git a/pyproject.toml b/pyproject.toml
index d637b419..f75fb6fd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ maintainers = [
 description = "GUI for PDF simulation and structure refinement."
 keywords = ['PDF structure refinement GUI']
 readme = "README.rst"
-requires-python = [3.10, 3.11]
+requires-python = ">=3.10,<3.12"
 classifiers = [
         'Development Status :: 5 - Production/Stable',
         'Environment :: Console',