Upgrading to 13.04 from Ubuntu GNOME Remix 12.10

[Ari Torhamo]

Hello,

My current installation is Ubuntu GNOME Remix 12.10, and I'd like to 
upgrade to Ubuntu GNOME 13.04. Can I just upgrade through 
update-manager, or do I have to do a fresh installation (preferably 
keeping the home folder intact). Surprisingly I wasn't able to find this 
information with one hour of Google search.

Many thanks,

-Ari-