January 9, 2026, 3:18 pm | Read time: 3 minutes
Since 2023, Apple has been experimenting with methods to deliver security patches quickly, easily, and independently of major system updates for its devices. With iOS 26.1, the company introduced so-called “background security improvements.” After a test run earlier this week, a second security improvement is now available for participants in the beta program for iOS, iPadOS, and macOS. TECHBOOK has installed the patches and explains what they entail.
Background Security Updates
Earlier this week, I received a security improvement in the form of iOS 26.3 (a) on my iPhone registered for the iOS beta. From Thursday night to Friday, a second improvement—iOS 26.3 (b)—followed shortly after.
As intended by Apple, the small patches are hardly noticeable. Unlike major system updates, they do not require a lengthy installation process and often require no restart. This means that protection measures for new vulnerabilities arrive faster. Users can only tell that a security improvement has been installed by a brief notification or if their device restarts.
Installation occurs on the iPhone in the settings under “Privacy and Security” > “Background Security Improvements.” Available updates can also be installed manually there. Users can also choose whether they want automatic installation. This allows the system to apply security improvements in the background as soon as they are available.
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What’s in the Test Updates?
Apple has rarely used rapid security updates in the past. Shortly after the introduction of the feature, then called “Rapid Security Measures,” corresponding updates appeared in special cases. Currently, these are exclusively test runs to put the “background security improvements” introduced with iOS 26.1 to the test.
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In the description for iOS 26.3 (a) and (b), Apple states: “This background security improvement is for testing purposes only and does not contain any security fixes.” Since the updates are only directed at beta testers, users of the public iOS version do not need to worry. If Apple were to release a security improvement for all users, it would likely be called iOS 26.2 (a).
Apple Gives Users Free Choice
Unlike major system updates, which cannot be easily removed after installation, users have the option to delete security improvements “in rare cases of compatibility issues.” In the settings overview, the option “Remove & Restart” is accessible via the “i” symbol next to the respective improvement.
In the past, the predecessor “Rapid Security Measures” led to an issue with website display. The ability to easily uninstall the small updates is therefore very convenient. After removal, users can either wait for a new security improvement or the next major system update. Each new iOS version includes all previous security patches by default—including those delivered via an improvement to the iPhone.