Mattermost server v10.5 has been implemented as a new Extended Support Release in February, 2025. v10.5 will be supported until November 15, 2025. We have been maintaining v9.11 as our current ESR. This version will come to the end of its life cycle. Starting May 15, 2025 we are no longer backporting fixes to v9.11. Please upgrade your systems to v10.5 as soon as possible to continue to receive important bug fixes and security updates and to maintain mobile compatibility.
Additionally, Mattermost Desktop App v5.11 has been implemented as a new desktop app Extended Support Release in February, 2025, and will be supported until November 15, 2025.
Extended Support Releases or ESRs are a strategic choice for organizations looking for stability and reduced frequency of updates. Using ESRs can minimize disruptions associated with frequent upgrades, making them an attractive option for environments where stability is paramount.