Migrating Jquery v1.5 to v3.3.1

Migrating Jquery v1.5 to v3.3.1

Hi, I am a webmaster in Brazil and I am working at a System that uses Jquery v.1.5 . I am using bootstrap so I have to migrate my system to a new version of Jquery. Cuz we have to have the best perfomance and the new version. But the JQuery have a lot of conflicts with the old version because of the functions at the list "deprecated". I am not sure what is the best option now: Make a new code or try to migrate all the old one. Example of function that I have so much here .live(); that I have to migrate to .on(); What you think that could be the best option in this case?