In WordPress 4.2, we’re upgrading tables to utf8mb4, when we can. Your site will only upgrade when the following conditions are met: You’re currently using the utf8 character set. Your MySQL server is version 5.5.3 or higher (including all 10.x versions of MariaDB). Your MySQL client libraries are version 5.5.3 or higher. If you’re using … Continue reading The utf8mb4 Upgrade