QT version (or so it seems)

Hello

Reading the read-me, at uv run --extra cpu demo_toolbox.py i get this error:

× Failed to build pyqt5==5.15.6 ├─▶ The build backend returned an error ╰─▶ Call to sipbuild.api.build_wheel failed (exit status: 1)

it seems the recent version of QT (6) is not supported? Any pointers that will avoid having 2 versions of QT installed welcome.