Update deployed MCUBoot public key

Hello,

I'm using NCS v1.9.0 with a nrf5340-based device.

Is there a method to update the public key embedded in MCUBoot using DFU after the initial load? I'm looking for a way to rotate keys on deployed devices, but don't see any documentation about how to update the key. 

I am using MCUBoot as the sole bootloader, and am not using the nRF Secure Immutable Bootloader.

Thanks,

Carson