v139 · miscellaneous

Chrome removes support for macOS 11

Chrome 138 will be the last release to support macOS 11; Chrome 139+ will no longer support macOS 11, which is outside of its support window with Apple. Running on a supported operating system is essential to maintaining security. On Macs running macOS 11, Chrome will continue to work, showing a warning infobar, but will not update any

concepts

  1. Release Note

    macOS 11 (Big Sur) drops off the supported list. Users on it get a final Chrome 139 build and then no further updates.

  2. Upgrade Nudge

    Server-side detection via Sec-CH-UA-Platform-Version. Pick an OS and see the in-page banner your site should render for macOS 11 visitors — with the actual headers and middleware sketch.

  3. End-of-Support Playbook Builder

    An interactive playbook generator: pick audience, impact level, target milestone, detection method, tone — get a tailored rollout plan, copy, and detection snippet. Enterprise gets MDM-friendly output; urgent tone auto-escalates to a modal.

  4. OS Version Compatibility Detector

    Uses navigator.userAgentData.getHighEntropyValues to detect macOS version and classify support — macOS 11 gets a "last supported" warning, 12+ passes, 10.x shows which Chrome version dropped it. Includes a compatibility timeline and server-side Sec-CH-UA-Platform-Version detection pattern.

why it shipped

Chrome 138 will be the last release to support macOS 11; Chrome 139+ will no longer support macOS 11, which is outside of its support window with Apple. Running on a supported operating system is essential to maintaining security. On Macs running macOS 11, Chrome will continue to work, showing a warning infobar, but will not update any

references