My app submission has been rejected by Apple three times now (three weeks total) because I am unable to reproduce a bug they say exists. Apple mentioned they tested using:
"iPad running iOS 6.1.3 and iPhone 5 running iOS 6.1.4"
When I check my iOS Simulator, the only versions available are 5.1 and 6.1. How can I update my iOS Simulator so that it has 6.1.3 and 6.1.4?
Go to XCode -> Preferences -> Downloads and check the box that says "Check for and install updates automatically"
There you can also see what other components are available for you to download.
Hope this helps!