Although I do not own any apple device (I mostly patronize Microsoft things), there is a scary reason why you should update it now.
Apple released iOS 7.0.6 fixing a bug that allow "an attacker with a privileged network position may capture or modify data in sessions protected by SSL/TLS."
Don't understand it? I'll tell you in pure layman terms: bad guys (or hackers, if you prefer) may fetch secured information (or "hack you," if you prefer) on your Apple device right now unless you download the update!
Still confused? Here's a more complete explanation from Gizmodo: http://gizmodo.com/why-apples-huge-security-flaw-is-so-scary-1529041062