WP4.2移機安裝問題：Unknow collation: 'utf8mb4_unicode_ci'

一如往常的想將在電腦弄好的wp網站放上server，放入資料庫資料時卻發現回應如下圖

仔細看了下：Unknow collation: 'utf8mb4_unicode_ci'。覺得很怪，以前都是用utf8_unicode_ci，查了下資料，發現The utf8mb4 Upgrade其中提到

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 mysqlnd, 5.0.9 or higher.

查了下自己的mysql server版本才5.1.x，看來得自行重新安裝一次了。