Accordingly to Qt version history - Wikipedia, the QT5 support has already ended for open source projects. So unless you buy a commercial licence, you end up in a support limbo. The logical step is to move to QT6, but it seems geant is not yet ready, as shown in a basic search Search results for ‘qt6’ - Geant4 Forum (cern.ch).
Is there any plan to implement this? I can’t see anyone here nor in the official web page.
What’s the current status if any?