How to update Puppy Linux?

Please go through this blog as i think it exactly describes what you need : how-to-update/upgrade-kernel-for-puppy-linux
I think this site could also help you.. flash-puppy
Another link which might help you is : Update from 4.1.2 to 4.2

Note : Take a look at this site also : installing-puppy-linux-to-your-hard-drive

Thanks,
Sen