How do you update js libraries and plugins in a complex project?

Question

JavaScript

Hello! There is a project with a large number of applications built on jquery with the addition of various plugins to this bunch. How would you organize the update of all related js libraries and plugins to the latest versions? For example, amcharts, leaflet.js, jquery, select2. Or the relevance of the versions does not matter? I would like not to break anything, but to bring benefits, since bugs are known to be fixed in new versions.

Added. I respect any urge to answer the question, but I suggest reading the text not diagonally and not trying to score points with a quick answer.

Answer 1

Dependencies: bower.
In order not to break anything, do integration tests (Selenium), and only after that change dependency versions through bower.

Answer 2

I have caching js files configured, and all links to all such files look like:
where 13123123123 is the timestamp from the time the file was modified.