Upgrading Debian kernel

I have recently upgraded one of my Debian servers from 10 to 11. The main issue I ran into was the fact that the kernel was backported. This meant that when running Debian 10, the kernel was newer than original (5.4 vs 4.19), but now that I have upgraded to Debian 11, which ships with 5.10 by default, I am now running older version than default. This is nothing to worry about, since the 5.4 is the 20th LTS (Long-Term-Support) release, meaning it will be supported up until December 2025. The sole reason why am I even doing this is to have the default and newest Debian kernel and avoid having a FrankenDebian.