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What will be deprecated in Mattermost v12.0? (October 2026)

mattermost.com · published 27 August 2026

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Host
https://docs.mattermost.com/install/install-docker.html
docs.mattermost.com
https://forum.mattermost.com/t/starting-with-mattermost-v12-0-october-2026-rhel-7-and-rhel-8-are-no-longer-supported-deployment-targets/25974
forum.mattermost.com
https://forum.mattermost.com/t/starting-with-mattermost-v12-0-october-2026-opensearch-1-x-is-no-longer-a-supported-search-backend/25979
forum.mattermost.com
https://forum.mattermost.com/t/starting-with-mattermost-v12-0-october-2026-atmos-camo-is-no-longer-supported-as-an-image-proxy/25980
forum.mattermost.com
React 19 Upgrade Guide Read at the source ↗
react.dev
https://forum.mattermost.com/t/starting-with-mattermost-v12-0-october-2026-the-mattermost-web-and-desktop-apps-are-built-on-react-19/26038
forum.mattermost.com
https://forum.mattermost.com/t/deprecation-notice-ios-16-versions/26074
forum.mattermost.com
https://forum.mattermost.com/t/starting-with-mattermost-v12-0-october-2026-user-and-personal-access-token-pat-sessions-can-no-longer-set-post-identity-or-display-override-props/26052
forum.mattermost.com
https://docs.mattermost.com/product-overview/deprecated-features.html
docs.mattermost.com
https://forum.mattermost.com/t/desktop-app-v6-4-requires-boards-v9-4-0-for-subpath-deployments/26064
forum.mattermost.com