Q: Software from 10.7.5 to 10.8.5 how to do it ?

Hi guys !

One quick question :

I have a Mac Book Pro (2011) with the software : Mac OS X Lion 10.7.5 (11G63)

And I would like to update it to the software : Mac OS X Lion 10.8.5.

Is it possible ( because I try some surf and it doesn't seem to work) ?

And what should I do ?

Thank you for your answers !!