[Update 10/22] Super Smash Bros Ultimate Update 9.0.1 is now available for the Nintendo Switch. We've included the release notes down below, as supplied by Nintendo.

Ver. 9.0.1 (Released October 21, 2020)

　　Fixed the issue where sometimes an opposing fighter would go through the landscape when Steve/Alex created a block at a certain location and the opposing fighter destroyed the block.Fixed the issue where sometimes an opposing fighter would go through the landscape when Steve/Alex created a block at a certain location and the anvil created with a down air attack struck the opposing fighter.Fixed the issue where the opposing fighter would become uncontrollable when Steve/Alex hit them with a minecart in certain situations.Fixed the issue where if Steve/Alex's minecart bounced off the wall, it would not hit the opposing fighter.Fixed the issue where opposing fighters carried in Steve/Alex's minecart would sometimes be warped to the original location where they were picked up.Fixed the issue where certain fighters could go through Steve/Alex's block once KO'd.[Original story] As confirmed by Nintendo, Super Smash Bros Ultimate update 9.0.1 will be arriving tomorrow.

　　Last week, Nintendo released the 9.0 update, which added support for DLC Fighter pack 7 and its new Minecraft challengers, Alex and Steve. Fast forward one week and Nintendo has now confirmed that a new update will be released, packing fighter adjustments.

　　Following the update, replay data from previous versions of the game will be incompatible. In order to save precious replays, be sure to convert them through  the Vault.

　　A new Ver. 9.0.1 of Super #SmashBrosUltimate will arrive tomorrow! This update will include fighter adjustments, meaning replay data from previous versions will be incompatible. Convert your replays by going to Vault -> Replays -> Replay Data -> Convert to Video, before updating. pic.twitter.com/vC4LmiJmp8

　　— Nintendo Versus (@NintendoVS) October 21, 2020

　　Exact details about the specific fighter adjustments haven't been revealed just yet. We'll update this post as soon as Nintendo releases the full patch notes.

　　Super Smash Bros. Ultimate is available globally now for the Nintendo Switch. To date, the insanely popular brawler features more than 77 fighters from various franchises, including Super Mario, Kirby, the Legend of Zelda, Donkey Kong, Pokémon, Metal Gear Solid, Sonic, Final Fantasy VII, Minecraft, and many more.

New characters and stages join the entire legacy roster!

　　Having trouble choosing a stage? Then select the Stage Morph option to transform one stage into another while battling—a series first! Plus, new echo fighters Dark Samus, Richter Belmont, and Chrom join the battle. Whether you play locally or online, savor the faster combat, new attacks, and new defensive options, like a perfect shield. Jam out to 900 different music compositions and go 1-on-1 with a friend, hold a 4-player free-for-all, kick it up to 8-player battles and more! Feel free to bust out your GameCube controllers—legendary couch competitions await—or play together anytime, anywhere!