Rocket League has been updated to version 1.99 today by Psyonix. You can find out the complete details on this update including the patch notes here.
This patch is released ahead of the Fast & Furious content which was revealed earlier this month. In addition to this new downloadable content, the game is also getting a Favorite Item Series as part of this update. You can find out more details on the various changes and bug fixes with the patch notes given below.