Apple rolled out iOS 6.1.3 to iOS owners today. It contains a security that’ll remove a reported lockscreen hack. The hack lets anyone bypass your password and access select information on your iOS device. There’s also improvements in Apple Maps for users in Japan.
According to earlier reports by Evasi0n, this version reportedly patches the holes used by the jailbreak, so you will want to avoid this update if you jailbreak your device. Everyone else can install the update by opening Settings > General > Software Update or connect your device to iTunes.