Mario Kart 8 Deluxe Version 3.0.3 update was released on September 11, 2024 . While official patch notes from

  1. You cannot play online. Nintendo’s servers block older versions.
  2. You cannot join friends who are on 3.0.3.
  3. You may experience save data corruption if you attempt to use the latest Booster Course Pass data on an older version.

Full Patch Notes (Ver. 3.0.3)

Official Nintendo documentation combined with community findings.

“I can finally dodge blue shells with a well-timed mushroom again!”

Mario Kart 8 Deluxe (Switch): all the updates (latest: Ver. 3.0.5) 22 May 2025 —

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