Right after a fresh new install of Fedora 24 (I ran dnf -y update && dnf -y upgrade), I noticed that :# rpm -qa kernel |sort -V |tail -n 1kernel-4.6.6-300.fc24.x86_64# uname -r4.5.5-300.fc24.x86_64So I ran dnf install kernel-devel --best, reboot and uname -r still returns me the same version.
How to update kernel
fedora
Your kernel is updated, but you need to reboot into the new version. Unlike other applications, for kernel updates, the reboot is required.