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BSI

Last Week on My Mac: Brilliant engineering in a flawed interface

After an unfortunate incident three years ago, RSRs were put on pause. Now they’ve been rebadged as BSIs, what is wrong with their current implementation? The list is long.

March 22, 2026 Macs, Technology

What is a Background Security Improvement, and how does it work?

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What is a BSI? Is it the same as an RSR? How does it patch vulnerabilities, and how is it installed and activated? What problems does it have, and what are its limitations?

March 19, 2026 Macs, Technology

Apple has just released the first Background Security Improvement for macOS Tahoe

Apple has just released its first public Background Security Improvement (BSI) for macOS 26.3.1 Tahoe, labelled as BSI […]

March 17, 2026 Macs, Technology, Updates

Last Week on My Mac: Tahoe 26.1 disappointments

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Two big disappointments: the new Liquid Glass control does nothing to address the problems, and Background Security Improvements haven’t learned from mistakes with RSRs.

November 9, 2025 Macs, Technology

How Tahoe 26.1 has enabled automatic security updates

If you have updated your Mac to Tahoe 26.1, you may be blissfully unaware that it will now […]

November 6, 2025 Macs, Technology
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