I need update to a new and stable version. i´m search but not have good lucky.
Thanks for your answer.
If the core centos repo don't have want your looking for (and neither does the testing repo), try these:
The best way would be to use CentOS's package manger 'yum' for MySQL:
yum update mysql-server
For phpMyAdmin, just download the latest stable version from their website http://www.phpmyadmin.net/ and copy that to the desired location. Don't forget to alter the config.inc.php file to your wishes afterwards.