How to upgrade video drivers on Debian stable?

I'm having some problems with my video driver on Debian stable. For some reason I cannot use testing. Don't know why, it was a while ago since I tried, but the computer basically does not start when using testing. So if possible, I'd like to upgrade only the video drivers. Since I have a Radeon RX 7700S, I assume that means a kernel upgrade? But how do I do it?