Find the correct release RPM for your version of CentOS from the MySQL Download Page (https://dev.mysql.com/downloads/repo/yum/)
CentOS release 6.8 (Final)
yum localinstall mysql57-community-release-el6-9.noarch.rpm
Edit the following file and enable the version of MySQL that you want to upgrade to. Also ensure you disable the ones you don\'t want.
yum update mysql-server
If you\'re using Plesk, you will need to run mysql_upgrade with the following parameters:
mysql_upgrade -uadmin -p`cat /etc/psa/.psa.shadow`