Definitely review the document that @maycne.sonahoz linked to. Reading the Stable Update Announcement should be done with every update, at least the first post, usually written by @philm.
It is important to note, that a normal update will not update/replace a kernel that has hit its’ EOL (End Of Life). You need to know which kernel you are running (uname -a), inspect the announcement, and install a new kernel. To list installed: mhwd-kernel -li. For other options see: mhwd-kernel -h. I usually stick with a LT (Long Term) kernel. They are listed at kernel.org.
Snippet from Stable Update Announcement 2021-12-10