Update kernel for WSL Ubuntu

I installed a new kernel in WSL v2 running inside Windows 10.The new kernel is 6.2, old is 5.15. There is only the 6.2 version in /boot. I rebooted the machine.Why does it still boot on told 5.15? How do I change it to the new kernel?

root@DESKTOP:/#ls boot/System.map-6.2.0-34-generic  config-6.2.0-34-generic  grub  initrd.img  initrd.img-6.2.0-34-generic  initrd.img.old  vmlinuz  vmlinuz-6.2.0-34-generic  vmlinuz.oldroot@DESKTOP:/#uname -rsaLinux DESKTOP 5.15.90.1-microsoft-standard-WSL2 #1 SMP Fri Jan 27 02:56:13 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux