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macOS and security updates in detail

Major macOS releases from Sierra to Ventura, with full details of each release and security update. Also updates to XProtect, MRT and Gatekeeper.

May 8, 2023 Macs, Technology

M-series Macs

For a systematic compilation of links to articles here about Apple silicon Macs, M1, M2, M3, M4 and […]

January 22, 2021 Macs, Technology

Why do macOS update sizes vary so much?

With yet another macOS security update to 26.6.2 due shortly, why do the download sizes of these updates vary so widely?

August 12, 2026 Macs, Technology

Apple has just released an update to XProtect for all macOS

Apple has just released its regular weekly update to XProtect for all versions of macOS, bringing it to […]

August 11, 2026 Macs, Technology, Updates

Portraits of trees: Apple

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Difficult to cultivate, as it can’t self-pollinate and doesn’t breed ‘true’, it has still become a major food crop around the world. From blossom to market in paintings.

August 11, 2026 General, Life, Painting

How can you run code that hasn’t been notarised?

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How can you run apps and executable code that hasn’t been notarised? Can you also run those with broken signatures, or none at all? And do the controls actually disable Gatekeeper or XProtect?

August 11, 2026 Macs, Technology

Hero or hooligan: Odysseus on Phaeacia

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He swam ashore naked and fell asleep in a pile of leaves, When he awoke the following, he walked in front of princess Nausicaä, and had to ask for her father’s help.

August 10, 2026 General, Life, Painting

Solutions to Saturday Mac riddles 372

I hope you enjoyed Saturday’s Mac Riddles, episode 372. Here are my solutions to them. 1: Fruit element […]

August 10, 2026 General, Macs, Technology

How much backup storage does your Mac need?

Does your backup storage really need to be twice the capacity of your Mac’s internal SSD? If you’re already backing it up you can estimate the size required more accurately, as given here.

August 10, 2026 Macs, Technology

Painting legendary self-sacrifice: Did the Horatii save Rome?

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Two sets of triplets fight outside the city of Rome acting as proxies for two warring cities. One survivor at the end demonstrates his loyalty by patriotic sacrifice. But which side was David on?

August 9, 2026 General, Life, Painting

Last Week on My Mac: Climate change

The latest XProtect update brings behavioural detection of malware, and extends assurance of app identification beyond notarisation. For some but not all Macs.

August 9, 2026 Macs, Technology

Painting legendary self-sacrifice: Did Horatius Cocles save Rome?

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A classic legend of self-sacrifice, in which a single Roman soldier defended a bridge against a whole army until it was demolished, and Rome was saved from the Etruscans.

August 8, 2026 General, Life, Painting

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