|List of updates
||May 17, 2017
||Displays opponent names in rear view in online matches, increases invincibility time upon being hit by an item in online matches, allows up to two players to spectate friend matches while waiting to join, decreases the chances of adding players to 200cc or Mirror matches in "Worldwide" and "Regional" online modes, allows players to create friend lobbies when they have 100 or more friends, changes to Inkling Girl's animation, starting positions in online races reflect the order in which players join a room, gives Mii racers facial expressions, adjusts tournament clocks to reflect real-world time.
||June 28, 2017
||Adds a Pikmin Mii costume unlocked by using Pikmin-based amiibo, displays race rules and course names on loading screens for online, local play, and Mario Kart TV; adjusts item distribution to allow players farther back to more likely receive items to catch up, limits the Piranha Plant to two at a time in online matches, fixes an issue that causes the controls to be unresponsive when the timer runs out in online when choosing a Mii racing suit, leaves items on the track if a Super Horn is used, fixes the item roulette so that it no longer spins continuously in online matches, the Boomerang now returns to the first item slot if possible after being thrown, the items shown in the item slot display correctly when holding an item behind the kart, it is no longer possible to use an item if it is used to block an item, fixes communication error issues.
||August 9, 2017
||Fixes an issue that prolongs the time to return to the lobby after races near the start and end times of tournaments.
||October 18, 2017
||Adds video capture compatibility, makes it more difficult to float down while gliders are deployed with Smart Steering, fixes an issue in which Spiny Shells hit the player in second place when the player in first place has not yet crossed the finish line, increased the invulnerability period after being hit or spinning out, applies Online Play changes from update 1.2.1 to Wireless Play and LAN Play (only one Piranha Plant will appear at a time during races, adjusted item distribution).
||December 12, 2017
||Adds Traditional Chinese, Simplified Chinese, and Korean language support; fixes an issue in which background music will not play after finishing a race.
||June 25, 2018
||Adds compatibility with the Toy-Con Motorbike from the Nintendo Labo Variety Kit, fixes an issue in which the "Search by code" feature stops working after creating an online tournament, fixes an issue in which players cannot move forward after colliding with a Star Thwomp.
||July 19, 2018
||Adds Champion's Tunic Link as a playable character, adds the Master Cycle Zero, Ancient Tires, and Paraglider as kart parts; gameplay adjustments.
||September 19, 2018
||Adds compatibility with the Toy-Con Car from the Nintendo Labo Vehicle Kit, adds compatibility with the Nintendo Switch Online smartphone app.
||January 23, 2019
||Fixes an issue causing the game to become unresponsive to any input except the Home button.
||May 25, 2021
||Fixes an issue in which tournament scores would be reset, fixes an issue in which match history with friends would be reset.
||March 17, 2022
||Adds support for the first wave of Booster Course Pass content, shortens the time for an Item Box to reappear after being collected, fixes an issue causing communication errors during 12-player matches, gameplay adjustments.
||August 4, 2022
||Adds support for the second wave of Booster Course Pass content, increases the maximum number of Time Trial ghosts that can be downloaded to 32, further shortens the time for an Item Box to reappear after being collected, decreases the amount of time that Coins dropped by a player will remain on the track, adjusts how much lighter racers will be pushed by heavier ones when bumped, adjusts Smart Steering to more easily face the path forward in mid-air, fixes an issue causing communication errors during 12-player matches, the driving Shy Guys on Wii Coconut Mall will periodically move in all modes except Time Trial, fixes an issue in which players in an online friend lobby could not select Booster Course Pass tracks even if another player has purchased it, fixes an issue causing players to not steal Coins from another player in Coin Runners when using the Feather item, fixes an issue in which players could receive two items from a single item box on N64 Toad's Turnpike.
||December 7, 2022
||Adds support for the third wave of Booster Course Pass content, adds "Custom Items" option for modes featuring item rules, gliders will no longer close when the Lightning item is used, the invulnerability time after being struck with an item is now determined based on the combination of character and kart parts, allows players to delete all currently-downloaded ghost data if new data cannot be downloaded, removes the "Recommended" search option for tournaments, fixes an issue in which a coin collected from an opponent's Crazy Eight would not be counted, fixes communication error issue when using a Boo, fixes an issue preventing the Super Horn from hitting more than one opponent at once, fixes an issue causing distorted images on SNES Mario Circuit 3, fixes an issue preventing players from obtaining multiple items in a row on GBA Snow Land, fixes an issue in which the computer opponents shown on the team select screen would not be the same characters that appear in the match, fixes an issue preventing the warning sound from playing for a Red Shell or Spiny Shell, gameplay adjustments.
||December 21, 2022
||Fixes an issue causing the image to become choppy when playing on Tour Berlin Byways online, fixes an issue causing Lakitu to return players to an incorrect spot after falling off on Tour London Loop.
||March 8, 2023
||Adds support for the fourth wave of Booster Course Pass content, adds a "Booster Course Pass" button to the main menu to allow players to purchase the pass from the Nintendo eShop, adjusts the statistics of several drivers and kart parts, allows players to use the rear-view mirror view after being hit or using a Bullet Bill, prevents being hit with Lightning when a Boo or Super Star is used at the same time, allows players to jump over the fence when jumping off of the second Whomp on Tour Berlin Byways, adds the option to toggle Golden Mushrooms when using Custom Items in Renegade Roundup, fixes an issue causing a player's kart to clip through the ground after being hit with Lightning, fixes an issue causing Lakitu to carry a player after colliding with a wall, fixes an issue in which opponents could not be hit with Red Shells when using a half-pipe, fixes an issue allowing players to use another item immediately after using a Boo, fixes an issue preventing the Boomerang from being thrown again if it enters the second item slot when caught, fixes an issue in which running into a Crazy 8 Blooper would spray ink on the player, fixes an issue in which using the rear-view mirror would cause Blooper ink to momentarily disappear from the screen, fixes an issue in which being hit with a Red Shell at the same time as using a Bullet Bill would take the player off of the course, fixes an issue in which a communication error would occur if the player cannot move forward while driving on an escalator in Wii Coconut Mall, fixes an issue in which using a Bullet Bill on N64 Kalimari Desert would cause the player to clip into the ground, fixes an issue causing players to get stuck on the bridge posts at the starting line of Tour London Loop, fixes an issue causing players to be pushed farther than normal on the wavy roads on 3DS Rainbow Road.
||July 11, 2023
||Adds support for the fifth wave of Booster Course Pass content, adjusts the statistics of several drivers and kart parts, adjusts item probabilities during races with four or less players using Custom Items, increases distance for Red Shell and Spiny Shell warnings appearing, Red Shell and Spiny Shell warnings now have display priority over other warnings, Red Shell warnings will no longer appear when another racer is the target, the L/R button displays on the class selection and course selection screens can now be used with the touchscreen, decreases the frequency of Mirror and 200CC races when playing in Worldwide or Regional rooms, fixes an issue causing a communication error when catching a Boomerang and receiving an item from a Boo at the same time, fixes an issue preventing players from using items when catching a Boomerang and obtaining an item at the same time, fixes the statistic graph display when using a heavyweight Mii to more accurately reflect its true statistics, fixes an issue preventing the Bullet Bill warning from appearing when an opponent uses a Bullet Bill in online races, prevents karts from spinning or crashing from an obstacle when using a Super Star, Boo, or Mushroom at the same time, fixes an issue in which players could get stuck between a cliff and a mushroom on Wii Mushroom Gorge, fixes an issue in which a Bullet Bill would takes players off of the course when used in front of the finish line on GBA Riverside Park.
||November 8, 2023
||Adds support for the sixth wave of Booster Course Pass content, adds Booster Course Pass staff credits, adds a "Music" menu and button to the main menu, adds the Daisy Mii Racing Suit and additional amiibo compatibility, allows players to display the Room ID in a created room to allow non-friends to play in a created room, adjusts the invulnerability time for several drivers and kart parts, allows players to create rooms regardless of if they have any registered friends, further shortens the time for an Item Box to reappear after being collected, Item Boxes no longer give stronger items when driving in reverse or when collecting Item Boxes from the same location, further decreases the frequency of Mirror and 200CC races when playing in Worldwide or Regional rooms, fixes an issue causing Bob-omb cars to blow up for other players online on Wii Moonview Highway when they do not for the player, fixes an issue when racing with Ghosts in Time Trials on Yoshi's Island in which the red path would not appear when the Ghost touches the Winged Cloud.