Why the urgency? Apple on Thursday released a patch fixing a previously unknown security flaw that can give hackers complete access to a targeted iPhone. That is a Very Bad Thing.

Software exploiting that vulnerability was found “targeting an activist’s iPhone in the Middle East,” the Associated Pressreports. Once a flaw like that is out there, it’s only a matter of time before other hackers start using it. So be proactive and patch up your phone before they have the chance.

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To update your iPhone, open Settings, then General, then Software Update, then “Install.” (iOS 9.3.5 is the version you want.)