Percona upgrade from 5.5 to 5.6

I am using Percona 5.5 as our production server. I need to upgrade this server into 5.6.If anybody did this upgrade please help me to upgrade my server

Roni, you can follow the official documentation from Percona.com website - http://www.percona.com/doc/percona-server/5.6/upgrading_guide_55_56.html
Mind you that this upgrade will incur downtime, and since you are dealing with production it would be wise do make a replica of the production server then point your application to the replica while you update your production servers.