On Wednesday, Apple released iOS 12—which fixes a security flaw recently fixed in newer versions of the operating system.
A major vulnerability in iOS 15 was recently patched with the company's 2018 operating system.
Apple warns that the WebKit bug could have exposed your device to malicious code.
So, if you're still running iOS 12 phones, you should download the update right away.
Devices that are vulnerable include: iPhone 5s, iPhone 6, as well as iPad Air, iPad mini 2 and iPad mini 3.
Users can download and install the iOS 12 update by heading to Settings > General > Software Update.