Third-party (NPoco) package in ASP5 MVC6 says DNX Core 5 - Not Available

I'm Trying to port WebAPI2 to MVC6 but I've run in to the following obstacle everywhere.

Hovering over the missing reference gives me a dialog box saying:

DNX 4.5.1 - Available
DNX Core 5 - Not Available

I guess i needs to be available in both frameworks but how.
When i look under references its there under both DNX versions.

Is it because of incompatibility with ASP5 and the package needs a newer version or something?

The dependencies i have are:

"dependencies": {
"Microsoft.AspNet.Mvc": "6.0.0-beta4",
"Microsoft.AspNet.Server.IIS": "1.0.0-beta4",
"Microsoft.AspNet.Server.WebListener": "1.0.0-beta4",
"Microsoft.AspNet.StaticFiles": "1.0.0-beta4",
"NPoco": "2.8.99-beta"
},