That's fairly common. 5.3 hasn't reached end-of-life yet, so bugs are still being fixed. 5.3.16 is a bugfix release, wheres 5.4 will contain bugfixes and may (I

That's fairly common. 5.3 hasn't reached end-of-life yet, so bugs are still being fixed. 5.3.16 is a bugfix release, wheres 5.4 will contain bugfixes and may (I don't know, I haven't read the release logs) also contain new features.