Mattermost 11.8 End of Life

Support dates and upgrade guidance — rebuilt from live data.

Supported

Mattermost 11.8 is actively supported. It reaches end of life on 15 Sept 2026.

37 days of security support left

11.8.4 latest release

59% of this branch's supported lifetime has elapsed — 16 Jun 2026 → 15 Sept 2026.

Check your versionsudo -u mattermost /opt/mattermost/bin/mattermost version

Support timeline

Official dates from the Mattermost release process.

Moving to Mattermost 11.9 extends security support by about 30 days.

Branch	End of life	Days left	vs 11.8
Mattermost 11.9	15 Oct 2026	67	+30 days
Mattermost 11.8	15 Sept 2026	37	this branch
Mattermost 11.7	15 May 2027	279	+242 days
Mattermost 10.11	15 Aug 2026	6	-31 days

When does Mattermost 11.8 reach end of life?

Mattermost 11.8 reaches end of life on 15 Sept 2026 — 37 days from now. After that date it receives no security fixes.

Is Mattermost 11.8 still supported?

Yes. Mattermost 11.8 is currently maintained. Latest release: 11.8.4, published 17 Jul 2026.

What happens when Mattermost 11.8 reaches end of life?

Security fixes stop. After 15 Sept 2026 this branch receives no further updates under standard support.

How long do I have to upgrade from Mattermost 11.8?

37 days. Moving to Mattermost 11.9 instead buys roughly 30 more days of security support.