why html5boilerplate is stuck to V5.3.0 with old version of all Bootstrap, normalize & modernizr?

I just noticed that when I download html5boilerplate V5.3.0 it comes with

1. Bootstrap v3.3.1 (but Bootstrap v3.3.7 is available)
2. normalize.css v3.0.2 (but normalize.css 7.0.0 is available)
3. modernizr 2.8.3 respond 1.4.2 (but modernizr 3.5 is available)

so why html5boilerplate come with old version of Bootstrap, normalize & modernizr ? Can I update latest version of all Bootstrap, normalize & modernizr on my own ? will that break any settings of html5boilerplate ? is it safe to update all Bootstrap, normalize & modernizr on my own ?

Again how can I update Bootstrap, normalize & modernizr into html5boilerplate ? any shortcut or something ?

or html5boilerplate is old thing now ? anything new and better then html5boilerplate came in ?

Usefull links : 1. https://html5boilerplate.com/ 2. https://necolas.github.io/normalize.css/ 3. http://getbootstrap.com/ 4. https://modernizr.com/

As I shared on the Github repo, if you download the project from Github you get updated versions of almost everything (minus Modernizr which is one PR away from being updated.) Also, we're looking to release 6.0 sooner rather than later. I just need some help getting the last few issues cleared (I'm the only active developer right now and... I'm super busy with work.)