[dev-context] Lua version?

Hello, which Lua version does ConTeXt use? The following: echo print('== ConTeXt: this is ' .. _VERSION .. ' ==') > CtxLuaVer~.lua tex\texmf-mswin\bin\luametatex.exe --luaonly CtxLuaVer~.lua > CtxLuaVer~.log yields == ConTeXt: this is Lua 5.5 == whilst the latest Lua version released on https://www.lua.org is 5.4.7. (I need this for possible building DLL extension(s) - Lua module(s) - to ConTeXt.) All best in the new year! Lukas