npm install bootstrap@4 not work

Created by: AndreaLombardo

Hi guys, i'm tried to use

npm install bootstrap@4

As mentioned in the quick start section: https://github.com/twbs/bootstrap/tree/v4-dev#quick-start

But not worked for me. Instead I've got the message:

npm ERR! No compatible version found: bootstrap@4
npm ERR! Valid install targets:
npm ERR! 4.0.0-alpha.2, 3.3.6, 3.3.5, 3.3.4, 3.3.2, 3.3.1, 3.3.0, 3.2.0, 3.1.1, 0.0.2, 0.0.1

It's case to update your Quick Start section or there is something wrong in my npm installation? Thanks!