Yep, but we're not likely to add more things to v15, it will be 16.1. We do accept (bugfixes) for v13 and if something absolutely needs a breaking change for the next major. Currently v16 is in RC, so the next major would be 17. If you need a fix for an LTS version, it will go into the next whatever version we're releasing, which in this case will be 16.1, which I appreciate is a bit of a longer wait (~6 weeks, I believe early July is 16.1).