relatively old kernel?

Hi, i was just switching to the unstable channel and NixOS in general, but I'm still on Kernel version 6.1.xx.
Is this normal?
On my Fedora Laptop I didnt update quite a while is Kernel version 6.5.xx installed.
I dont have a problem with that, as long as everything just works (yeah funny i know). But why is that, maybe a bug? Or just the spirit of this distribution?