Mar 14, 2013 Xcode 4.6.1 Released To Support Mountain Lion 10.8.3 To coincide with the update to Mountain Lion (10.8.3), Apple has released Xcode 4.6.1. Updates include: » Support for Mac OS X 10.8.3 » Fix for apps using ARC that would not launch on OS X 10.6 (Snow Leopard) » Other minor fixes