• Support for Mattermost Server v9.11 Extended Support Release has come to the end of its life cycle on May 15, 2025. Upgrading to Mattermost Server v10.5 or later is required.

• Upgrading from ESR-to-ESR (major -> major_next) is fully supported and tested. However, upgrading from ESR-to-ESR (major to major+2) is supported, but not tested. If you plan to upgrade across multiple releases, we strongly recommend upgrading from an ESR to another ESR. For example, if you’re upgrading from the v8.1 ESR, upgrade to the v9.5 ESR or the v9.11 ESR.

• See the Important Upgrade Notes documentation for details on upgrading to a newer release.

• See the changelog in progress for details about the upcoming release.