从NuGet更新现有第三方引用的最佳方法

I have been trying to use NuGet in a complex solution (with around 100 project files) and been struggling with updating the existing references (from a /ext/.. directory ) to that of official NuGet directory. As far as I understand we need to manually select the project files (from the PackagaManager GUI/Manage Assemblies) and update the references. This is cumbersome to know which project uses what out of 100 odd projects. Is there any way (built-in to nuget or any other workaround) to update assemblies to nuget directory without having to manually select projects? I have been trying to use NuGet in a complex so