The language itself hasn't had any official version numbers since 2.0 (in 2006), but the runtime has (not very public) version numbers if you look at the source

The language itself hasn't had any official version numbers since 2.0 (in 2006), but the runtime has (not very public) version numbers if you look at the source: http://www.opensource.apple.com/source/objc4/ http://www.opensource.apple.com/source/objc4/