https://wccftech.com/super-smash-bros-ultimate-update-9-0-0-available-notes/

Nintendo has released Super Smash Bros Ultimate Update 9.0.0 for the Switch, which adds support for DLC Fighter Pack 7.

The new update makes Minecraft’s Steve and Alex available as paid DLC within the brawler for those who have purchased the new DLC fighters individually or though Fighter Pass Volume 2. In addition to support for the new challenger pack, the update packs numerous fighter adjustments, stability fixes alongside several fixes to improve gameplay experience.