yum install http://dev.mysql.com/get/mysql57-community-release-el6-7.noarch.rpm

Dependencies Resolved

=============================================================================================================================================================================================================================================
Package Arch Version Repository Size
=============================================================================================================================================================================================================================================
Installing:
mysql57-community-release noarch el6-7 /mysql57-community-release-el6-7.noarch 7.8 k

Transaction Summary
=============================================================================================================================================================================================================================================
Install 1 Package(s)

Total size: 7.8 k
Installed size: 7.8 k

Please backup all databases before upgrading:
yum update mysql