You can either use DLSS Swapper or manually download a new DLL and drop it in yourself. It’s essentially just replacing the nvngx.dll in the game’s directory with a new one.
There are some issues, though - for example, upgrading from a version prior to 2.5.1 will disable the use of the sharpness slider. I mitigate this by using DLSSTweaks to force preset C, which favors the newest frame more heavily.
For some reason, Larian shipped an old version of DLSS with the game. It looks better if you swap out the DLL for a newer one. I use DLAA on my 3070 TI and it looks good, but I did have to swap the DLL.