Apple has today released iOS 12.5.5 for older devices not compatible with iOS 15, as well as 2021-006 Security Update for macOS Catalina, bringing fixes for several security vulnerabilities, including one that was reportedly used to infect devices with NSO Pegasus spyware.
As these updates appear to have been released to address a small number of specific issues, our expectation is that they do not contain any accessibility changes for blind and low vision users; however, if you notice any changes, improvements or regressions in your own use of these releases, please post a comment with your findings.
iOS 12.5.5 is available for iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation).
Apple's release notes for iOS 12.5.5 simply state that the update, "Introduces important security updates and is recommended for all users."
How to update
iOS 12.5.5 is available via Over-the-Air Update (Settings > General > Software Update) via Finder on a Mac with macOS Catalina or later, or via iTunes on a PC or Mac with macOS Mojave or earlier.
Before updating, we strongly recommend making a full and complete backup of your device (either locally or in iCloud, depending on personal preference). This will ensure that, in the unlikely event that something goes wrong during the update process, you will have a current backup on hand in case a device restore becomes necessary. Also, if using OTA update, we recommend plugging your device into a power source for the duration of the download/installation process, so as to prevent the unlikely event of your battery going dead during the update.
More information on how to update the software on your device is available on this Apple Support page.
To install 2021-006 Security Update for macOS Catalina, choose System Preferences from the Apple menu, click the Software Update preference pane, and click the Update Now button to begin the update process. If other updates are available, you can click "More info" to see details about them and select specific updates to install.
More information on how to update the software on your Mac is available on this Apple Support page.