Mario Kart 8 Deluxe Update 3.0.3 (Working – 2025)

To ensure you have the latest version for online play, you can check for updates manually:

Version: 3.0.3 (released September 11, 2024).
Scope: Small stability/security patch — Nintendo’s notes: “Several issues have been addressed to improve the gameplay experience.”
Unlisted/verified change: fixes a network-code vulnerability (often reported as a buffer-overflow exploit—“KartLANPwn”) that could allow remote code execution during local/online multiplayer. No gameplay, balance, graphics, or audio changes were made.

“This is an outrage!” Bowser roared. “I didn’t pay for the Deluxe pass to get deluxe problems!” mario kart 8 deluxe update 3.0.3