Debian 12 ‘Bookworm’ is now officially supported and available from our installer menu. Note that the installer menu option will wipe your existing data – let us know if you’d like to attach an additional new disk image to do a clean install to while temporarily keeping your old disk image to transfer data from. We’ve recently added an ‘altboot’ command to the vpsconsole allowing you to choose which disk image to boot from, which assists this process.
It’s also possible to perform an in-place upgrade from within your VM, with the usual risks from configuration, compatibility and software availability changes that come with any distro upgrade. Let us know if you plan to upgrade from Debian 10 ‘Buster’ since we might need to switch your VM mode from PV to PVH.