CSLA.NET version 4.3 with .NET Framework 4.5.2

Hi,

Currently we are using CSLA.NET version 4.3 in our applications. Most of the applicaiton are in .NET Framework 4. We are planning to migrate all applicaiton to latest .NET framework 4.5.2

Do we need to migrate CSLA.NET also to its latest version? Is latest CSLA.NET version is backward compatible to older CSLA.NET version?

Or , if we can get list of functionalitie sin CSLA.NET which wont be supported with .NET 4.5? 

Thanks,

Kshitiz