Today, Apple released iOS 11.1 and macOS High Sierra 10.13.1, which bring a notable security update, bug fixes, and a handful of other changes to modern iPhones, iPads, iPods, and Macs.

Critically, both software updates address the KRACK Wi-Fi vulnerability for some devices. It is a serious vulnerability in the WPA2 Wi-Fi security standard that allowed hostile actors to perform a key reinstallation and listen to Wi-Fi traffic for passwords and other personal data, among other things.

Update: As Ars readers have pointed out, Apple's support documentation states that the iOS KRACK fix is available for iPhone 7 and later, and for the early 2016, 9.7-inch iPad Pro and later. It is unclear whether this means previous devices are still vulnerable, or they had previously not been vulnerable and thus didn't need an update. Ars has reached out to Apple for comment.

Both also introduce numerous new Unicode 10.0 emoji. As previously reported, they include the "I love you" hand sign, a wizard, a takeout food box, gender-neutral characters, and much more. Here are a few of the emoji that have been added.

Additionally, macOS 10.13.1 fixed bugs like Bluetooth appearing unavailable while using Apple Pay and keyboard input sometimes not working in Spotlight. For the enterprise, Apple says this update adds support for unlocking a FileVault-encrypted APFS volume using a recovery keychain file. It also makes SMB printing more reliable and makes it possible to access Touch ID preferences on recent MacBook Pros while logged in as a mobile account.

iOS 11.1 brings back a 3D Touch gesture that allows you to switch between apps by gesturing or applying pressure at the sides of the screen. Apple had removed this functionality in a previous release. The update fixes several small issues with Photos and makes some improvements to various accessibility features.

Apple also released tvOS 11.1—a minor update consisting primarily of minor bug fixes and a KRACK vulnerability fix—and watchOS 4.1 today. The latter brings a lot of welcome changes, like the ability to toggle automatic Wi-Fi connections on and off. The watch's preference for Wi-Fi caused connectivity problems for some reviewers and current users who wanted to use their watches while in range of nonfunctional or paid wireless networks.