Two new methods on and off are the new way of declaring event handlers. bind, delegate and live area deprecated. Also better performance for delegated events.

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

Prevents you from data breaches and liability risks
Upgrade at your own pace
Works with modern Rubies

jQuery 1.7 Released

Rails Long Term Support