Right now, it's on the master branch of our GitHub repository 🙂
Yes! Thanks 🍗
The newest jQuery versions seem to be just smaller and faster. There's no major api changes, so everything should work without changes. It just breaks compatibility with older browsers. Which is probably why we are still using an older version.
It would be interesting if we had some test results to see whether the speed increase is worth the reduced compatibility. My guess is it's not.
I see no reason we can't move to a newer version of jQuery actually.
We made the conscious decision to stick with the v1.x branch due to IE compatibility, but as jQuery 2+ itself supports 9+, and Microsoft actually doesn't support anything below 11, I think it's safe to say we can update the lib now