I get
Unable to find a version of 'Unity' that is compatible with 'NakedObjects.Core 7.1.3 constraint: Unity (>= 3.5.1404 && < 4.0.0)'.
When I try and update any package in VS 2017. I have the latest version of nuget. And the current version that is install in my project is indeed Unity 3.5.1404.