From the last (or maybe the two last) update, I can\'t update the package NETStandartLibrary in Nuget. I just create a new standard library project. See this message :
Adding the following to your csproj also seems to work:
<ItemGroup>
<PackageReference Update="NETStandard.Library" Version="1.6.1" />
</ItemGroup>
You can't change this from the GUI because this package is impliclity defined from your TargetFramework. To change the version of NETStandard.Library package, add the following to your csproj file.
<PropertyGroup>
<NetStandardImplicitPackageVersion>1.6.1</NetStandardImplicitPackageVersion>
</PropertyGroup>