Mario Kart 8 Deluxe 3.0.3 -

: Unlike previous major updates (such as version 3.0.0), version 3.0.3 did not alter character stats, vehicle invincibility, or item appearance rates.

v3.0.3 update for Mario Kart 8 Deluxe was a surprise maintenance patch following the conclusion of the Booster Course Pass DLC. While Nintendo's Official Support Patch Notes broadly stated "several issues have been addressed to improve the gameplay experience," technical deep dives reveal its primary purpose was security and stability. Key Technical Fixes Netcode Security mario kart 8 deluxe 3.0.3

These are features: