Apple released iOS 26.3.1 (a), its first Background Security Improvement, on Tuesday, March 17. The tech giant wrote online that the update fixes an issue in WebKit, the engine that powers Safari and other third-party browsers in iOS.
If you have enabled automatic installation of Background Security Improvements, your iPhone should install this update on its own. If you don’t have automatic installs, or if you want to make sure your iPhone downloaded the update, go to Settings > Privacy & Security > Background Security Improvements. From here your iPhone will either say iOS 26.3.1 (a) is already installed or you’ll see an option to install the update.
Apple usually notes when an update addresses a bug that has been exploited in the wild. While the company didn’t indicate whether that’s the case for this update, Apple recommends everyone download the update.
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