I have been given a project that uses K2 4.6.7 that was developed in Visual Studio 2013.  The K2Worflow project shows up with (incompatible) next to the project in visual studio 2013.  What do I need to to do to get the K2 components into Visual Studio 2013?

I am running the following:

Windows Server 2008 R2 (64-bit)
SQL Server 2008 R2
SharePoint Server 2010
K2 blackpearl 4.6.7
Visual Studio Premium 2013