Even though Assassin’s Creed: Odyssey is almost three years old at this point, Ubisoft has released an update adding a new feature for current-gen consoles, giving the game 60 frames per second on the PlayStation 5 and Xbox Series X and Series S.
Check out the full patch notes below:
Xbox One: ~370 MB
PlayStation 4: ~470 MB
This update adds support for 60 frames per second when running the game on Xbox Series X|S and PlayStation 5 due to backward compatibility
That seems to be it. Ubisoft hasn’t released a more detailed list of changes that includes bug fixes and the like.