There is a (non-Microsoft) NuGet package that allows upgrading the Mvc3 to Mvc4.
There is a (Microsoft) article that explains how to manually migrate from Mvc3 to Mv
As an answer that someone suggested, then for a unknow cause removed, I will add this article reference for the question above:
How to Upgrade an ASP.NET MVC 4 and Web API Project to ASP.NET MVC 5 and Web API 2