Returnal update 3.04 was released today for PS5 by Housemarque. You can learn more about this update with the patch notes here.
While the official website hasn’t been updated to reflect the patch notes for the new update, it could be related to some minor bug fixes. It is also possible that Housemarque is updating the game with VRR support or to enhance the existing performance of the game.
Returnal Update 3.04 Patch Notes
As there are no official patch notes of the update available yet, we are waiting to hear more from the developers. In the meanwhile, you can keep checking back to see if the official patch notes are released.