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We stepped up to latest Debian Linux release. The openHABian image for RPis uses Raspberry Pi OS (lite) and we finally managed to switch over to latest RaspiOS which is "bookworm" based. Note that not all 3rd party tools are fully tested with bookworm homegear. If you run a bullseye (Debian 11) or even older distribution, please read the docs how to reinstall. It's safer to reinstall (and import your old config, of course) than to attempt doing a dist-upgrade. See also the OH4 migration FAQ on the forum.
Support for the new Raspberry Pi 5 is also included as part of the bookworm update. Please note that while a RPi5 has new HW features such as PCI-E SSD, nothing has changed about peripheral support in openHABian, unsupported parts may work or not.