Heads up, iOS users, because you’ve got a surprise software update coming your way.

Apple is now pushing iOS 9.3.4 to the iPhone, iPad, and iPod touch. This update is a small one, but Apple says that it includes “an important security update.”

To grab iOS 9.3.4, you can get your iPhone, iPad, or iPod touch and launch the Settings app. From there, tap General, then go into Software Update. You can also plug your device into your computer and update using iTunes.

Most people keep at least some personal info on their smartphones, so it’s important to keep them secure. The iOS 9.3.4 update helps improve the security of Apple’s mobile devices, and so if you’ve got an iPhone, iPad, or iPod touch, you should install iOS 9.3.4 as soon as possible.