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The LuaJIT website basically still says it's specced for 5.1, but the GitHub shows several open and closed Issues relating to various 5.2, 5.3, 5.4 things. I assume individual features are just being ported as-needed by contributors? Is there anywhere I can find a list (needn't be comprehensive) about the key features that are/aren't supported?
openresty's LuaJIT2 has, and makes, regular releases (the last one was less than a month ago), and closely tracks development, including the extensions beyond Lua 5.1.
Pallene is still just an experimental research project, but there is enough done that it is possible to write full programs. The Github repo is here. If you really want Lua 5.3 and 5.4 features while getting improved performance, I think Pallene may get you there before LuaJIT gets there.