AFNetworking not compatible with iOS 4.3

I am using CocoaPods to install the AFNetworking library. Here is my simple CocoaPods file:

platform :ios
pod 'FMDB'
pod 'AFNetworking'

My Pods project and my main project are iOS 6 deployment target and base SDK. When I run the pod install I get the following error:

AFNetworking not compatible with iOS 4.3

UPDATED:

I edited my Podfile to this:

platform :ios, '6.0'
pod 'FMDB'
pod 'AFNetworking'

Now when I run pod install it shows the following:

Updating spec repo `master'

Cocoapods 0.15.1 is available.

Using AFNetworking (1.0) Using FMDB (2.0) Generating support files

But it never adds the AFNetworking pod to the pods project in xCode.