Mario Kart 8 Deluxe update 4.0.1: bug fixes for Switch and Switch 2

Based on the available patch summary, this is a maintenance update with bug fixes rather than new content or extra features. One issue mentioned involved Wii Rainbow Road on Switch 2.

The information provided also mentions additional bug fixes, but does not include a full official list of all changes. That means it is only certain that the patch includes more than the Wii Rainbow Road fix.

What happened

Nintendo rolled out update 4.0.1 for Mario Kart 8 Deluxe on October 15, 2026. The patch brings the game to version 4.0.1 and is described in the available information as a bug-fix update. That means the update focuses on maintenance and corrections, rather than new tracks, characters, or other extra content.

The update is available for both Nintendo Switch and Nintendo Switch 2. In the patch summary, Nintendo is specifically said to have addressed an issue on Wii Rainbow Road that affected Switch 2. The source lists that as one concrete fix within the update, but does not provide the full official patch notes.

Because of that, it is not possible to give a complete list of every change based on the information provided. What is clear, though, is that the patch includes more than just the Wii Rainbow Road correction, since the supplied description also refers to other bug fixes. For both platforms, the update is therefore relevant, even if not every individual issue is broken out in the source.

The 4.0.1 version number also shows that Nintendo continues to support the game after earlier updates. In the available information, the patch is not presented as a major content update, but as a small correction pass meant to fix existing problems. That fits Nintendo’s usual approach to releasing interim versions for long-running first-party games.

Background

Mario Kart 8 Deluxe launched in 2017 and is one of Nintendo’s longest-running Switch titles. The supplied source also says the game has now sold more than 70 million copies. That figure appears in the source text, but no separate official sales source is included in the provided information to verify it independently.

The source also refers to an earlier Switch 2 update in September 2026. That update reportedly added shorter load times, 8-player split-screen multiplayer, and CameraPlay support. It shows that Nintendo released multiple Mario Kart 8 Deluxe updates in 2026, across different versions and feature sets.

Mario Kart World is mentioned in the same context as a Switch 2 launch title and successor to Mario Kart 8 Deluxe. That reference places Mario Kart 8 Deluxe in a broader Nintendo racing-game context, with the older Switch hit still receiving updates while the Switch 2 generation has already begun. However, the supplied information mentions Mario Kart World only as contextual background, not as part of the 4.0.1 update itself.

The October 15, 2026 update fits that pattern of ongoing support. The available information explicitly describes version 4.0.1 as a bug-fix patch for both Switch and Switch 2, with a specific correction for a Wii Rainbow Road issue on Switch 2. Since the full patch notes were not provided, the exact total of changes remains unknown, but the core of the update is clear: maintenance, fixes, and platform-wide stability.