If you're on a Mac, iPhone, iPad, or Apple Watch, it's a good idea to update it immediately - the latest emergency update has fixed a security issue that Apple said could have been claimed by the bad guys waterfall.
Security updates are available in iOS / iPadOS 14.5.1, macOS 11.3.1, and watchOS 7.4.1 to fix arbitrary code execution exploit bug found in WebKit, Apple's framework rendering most of the web content you see on your device (unless you are using such as Chrome or Firefox on a Mac). Updates patch a vulnerability that allows malicious websites to run unchecked code on your device, so this is not the kind of update you want to ignore.
If you have an older device, such as an iPhone 5s or 6, iPad Air or Mini 2 and 3, Apple has also released iOS 12.5.3 to fix WebKit errors.
Previously, iOS 14.4 and 14.4.2 had closed similar security flaws. Even if you don't think you should update because you use an alternative web browser on your Mac or don't browse the web on your Apple Watch, it's still worth updating whatever devices you have - WebKit can be used It's never been good to leave security holes on your device, especially security holes that may have been exploited.
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