Today is the official release date for the public versions of iOS 18, iPadOS 18, macOS 15 Sequoia, and a scad of other Apple software updates, the foundation that Apple will use for Apple Intelligence and whatever other features it wants to add between now and next year's Worldwide Developers Conference in June. But for those who value stability and reliability over new features, you may not be excited to update to a new operating system with a version number ending in "0."

For those of you who prefer to wait for a couple of bugfix updates before installing new stuff, Apple is also releasing security-only updates for a bunch of its (now) last-generation operating systems today. The iOS 17.7, iPadOS 17.7, and macOS 14.7 updates are either available now or should be shortly, along with a security update for 2022's macOS 13 Ventura. An updated version of Safari 18 that runs on both macOS 13 and 14 should be available soon, though as of this writing is doesn't appear to be available yet.

Apple has historically been pretty good about providing security updates to older macOS releases—you can expect them for about two years after the operating system is replaced by a newer version. But for iOS and iPadOS, the company used to stop updating older versions entirely after releasing a new one. This changed back in 2021, when Apple decided to start providing some security-only updates to older iOS versions to help people who were worried about installing an all-new potentially buggy OS upgrade.

Eventually, iOS and iPadOS users will need to install iOS 18 and iPadOS 18 to keep getting security updates. But for the handful of older iPads that can't run iPadOS 18, Apple will usually keep supporting those specific devices with security updates for a year or two. Apple was still providing new security updates for 2022's iOS 16 as recently as August, keeping older devices like the iPhone 8 and the first-generation iPad Pros reasonably secure even though they were incapable of running newer operating systems.