I have upgraded my Xcode to Xcode 5. From where can I change the version and build number which are now not visible in Target Summary?
You might want to check out a new tool I've been developing called Xcodebump. It can handle updating both CFBundleShortVersionString and CFBundleVersion. As a final step it will also checkin to git and tag the commit to match up with those CFBundle values.
The Xcodebump project is located here:
https://github.com/markeissler/Xcodebump
I developed Xcodebump because agvtool has become a bit crusty and this topic comes up on Stackoverflow quite often.