Debian kernel stuck at 4.4.167

I am setting up a Rock64 v2 from ayufan's Debian image, while it has been done upgrading from Stretch to Buster, the kernel remains as:
    Linux rock64 4.4.167-1213-rockchip-ayufan-g34ae07687fce #1 SMP Tue Jun 18 20:44:49 UTC 2019 aarch64 GNU/Linux
which is over 1 year old.

How can I manage to upgrade the kernel to a newer version?

Thanks in advance for your kind help.
Personally I just opted for Armbian Buster which includes the latest 5x kernel. You may want to go for Armbian Focal. Either way each Distro is rock solid and pretty much works out of the box with minimal configuration

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