It is possible to upgrade the official distro to bookworm. That method will leave you on a older kernel (5.10) There are a few community distros available here in the forum that are more updated.
Here is my Bookworm image for the uConsole
You can also build your own image using the kernel source in my GitHub and chrooting into a image and replacing the kernel. You can also use Pi-Gen to build a image from scratch, there is also a repo for it in my GitHub you can use as a starting point.