Apple is increasing the system requirements for Safari: The first beta of version 16 of the browser, which is planned for autumn 2022, is not available for macOS 10.15 Catalina, but only runs from macOS 11 Big Sur. The Safari Technology Preview, which is intended for pre-testing new web technology, even goes one step further: It now requires at least the current macOS 12 Monterey or the beta of macOS 13 Ventura.
End of support for macOS 10.15 Catalina is imminent
This also marks the end of the manufacturer’s general support for macOS 10.15. With the release of macOS 13 Ventura at the latest, Apple is unlikely to deliver any further updates for the older version of the operating system. A possibly final security update is currently in preparation.
Mac users who want or need to stay on macOS 10.15 should prepare to switch to another browser that continues to deliver security updates for older macOS versions, such as Firefox or Google Chrome. For Mac models that are still popular, such as the MacBook Pro and MacBook Air 2012, macOS 10.15 is officially over; newer versions can only be installed using workarounds.
No update promise from Apple
Safari 16 is part of macOS 13 Ventura and brings a number of innovations with it. This includes sharing tab groups, support for passwordless login with passkeys, syncing of site settings and extensions, as well as support for web push notifications and advanced features for web developers such as web inspector extensions, subgrid and container queries.
Apple has never clearly announced or promised how long browser and operating system versions will continue to receive security updates. It is common for the two macOS versions preceding the current version to continue to receive security updates for an indefinite period of time – but apparently by no means all the gaps are closed.