steps to upgrade cPanel MySQL 5.1 to 5.5
cPanel - Upgrading from MySQL 5.1 to 5.5
It is vital to keep upgrading your MYSQL old version to new version in order to use the latest technology in your application.
cPanel - Upgrading from MySQL 5.1 to 5.5 is quite easy. Follow the few given steps that will help you to upgrade your Mysql old version to new version.
Here is the cPanel Mysql upgradation tutorial