jQuery Forum

Latest is cool for testing, but not so nice in production. With each new version, there are always questions on the forum, "Why did my production site stop working?" The answer is often that they used latest, and it got updated.

I thought as much. It's just I don't know the history of jQuery very well and I don't know if they tend to release new versions that break old versions or not.

New versions do not tend to break sites that use only documented API calls. But sometimes code relies on a quirky behavior a side-effect or something that nobody but the author ever thought of.