Apple announced that they will require new apps to include 64-bit support and to be build with the iOS 8 SDK as of February 1, 2015. Beginning June 1, 2015 app updates will also need to follow the same requirements.
PSPDFKit is 64-bit ready as of 3.0.3 from September 22, 2013. The v3 series has been designed for iOS 6+7 (also iOS 5 up to 3.2.3) and can be compiled with Xcode 5 (SDK 7).
On September 22, 2014, we released PSPDFKit 4, which includes many updates and improvements over the v3 series and was designed for iOS 7+8 and Xcode 6 (SDK 8).
If you are already using PSPDFKit 4, everything's good - otherwise you should upgrade to the latest version soon. See our changelog for a full version history.