OK, so I'm building a project and it has Bootstrap 3.3.7 in it by default. I want to update this to 4.0. Went into NuGet, got the bootstrap 4.0 dependency, but the wwwroot/lib/bootstrap/dist/css/bootstrap.css is still a 3.3.7 file and so is the wwwroot/lib/bootstrap/dist/js/bootstrap.js file.

I did some looking and I guess there's some issues with bower and bootstrap 4 and .net core? Do I need to use npm instead of bower? and how do I change my site from using bower to npm?