Upgrading from Craft 4 to Craft 5: Database Character Set and Collation
MySQL 8.0 deprecated the utf8mb3 character set(opens new window), as well as the use of utf8 as an alias for utf8mb3(opens new window). MySQL recommends utf8mb4(opens new window) instead, and it’s expected that utf8 will become an alias for utf8mb4 in MySQL 8.1.