mattermost · amyblais · Jun 17, 2026 · Jun 18, 2026 · Jun 18, 2026 · Jun 18, 2026
diff --git a/source/administration-guide/upgrade/important-upgrade-notes.rst b/source/administration-guide/upgrade/important-upgrade-notes.rst
diff --git a/source/administration-guide/upgrade/open-source-components.rst b/source/administration-guide/upgrade/open-source-components.rst
@@ -39,6 +39,7 @@ Desktop
 Mobile
 -------
 
+- Mattermost Mobile v2.42.0 - `View Open Source Components <https://github.com/mattermost/mattermost-mobile/blob/release-2.42/NOTICE.txt>`__.
 - Mattermost Mobile v2.41.0 - `View Open Source Components <https://github.com/mattermost/mattermost-mobile/blob/release-2.41/NOTICE.txt>`__.
 - Mattermost Mobile v2.40.0 - `View Open Source Components <https://github.com/mattermost/mattermost-mobile/blob/release-2.40/NOTICE.txt>`__.
 - Mattermost Mobile v2.39.0 - `View Open Source Components <https://github.com/mattermost/mattermost-mobile/blob/release-2.39/NOTICE.txt>`__.
@@ -141,6 +142,7 @@ Mobile
 Server
 ------------------------------
 
+- Mattermost Enterprise Edition v11.9.0 - `View Open Source Components <https://github.com/mattermost/mattermost-server/blob/release-11.9/NOTICE.txt>`__.
 - Mattermost Enterprise Edition v11.8.0 - `View Open Source Components <https://github.com/mattermost/mattermost-server/blob/release-11.8/NOTICE.txt>`__.
 - Mattermost Enterprise Edition v11.7.0 - `View Open Source Components <https://github.com/mattermost/mattermost-server/blob/release-11.7/NOTICE.txt>`__.
 - Mattermost Enterprise Edition v11.6.0 - `View Open Source Components <https://github.com/mattermost/mattermost-server/blob/release-11.6/NOTICE.txt>`__.

diff --git a/source/deployment-guide/server/linux/deploy-rhel.rst b/source/deployment-guide/server/linux/deploy-rhel.rst
@@ -44,7 +44,7 @@ In a terminal window, ssh onto the system that will host the Mattermost Server.
 
   .. code-block:: sh
 
-    wget https://releases.mattermost.com/11.8.2/mattermost-11.8.2-linux-amd64.tar.gz
+    wget https://releases.mattermost.com/11.9.0/mattermost-11.9.0-linux-amd64.tar.gz
 
 .. tab:: Current ESR
 

diff --git a/source/deployment-guide/server/linux/deploy-tar.rst b/source/deployment-guide/server/linux/deploy-tar.rst
@@ -45,7 +45,7 @@ In a terminal window, ssh onto the system that will host the Mattermost Server.
 
   .. code-block:: sh
 
-    wget https://releases.mattermost.com/11.8.2/mattermost-11.8.2-linux-amd64.tar.gz
+    wget https://releases.mattermost.com/11.9.0/mattermost-11.9.0-linux-amd64.tar.gz
 
 .. tab:: Current ESR
 

diff --git a/source/product-overview/mattermost-desktop-releases.md b/source/product-overview/mattermost-desktop-releases.md
@@ -18,7 +18,7 @@ Mattermost releases a new desktop app version every 4 months, in February, May,
 
 | **Release** | **Support** | **Compatible with** |
 |:---|:---|:---|
-| v6.2 [Download](https://github.com/mattermost/desktop/releases/tag/v6.2.2) \| {ref}`Changelog <release-v6-2>` \| [SBOM download](https://github.com/mattermost/desktop/releases/download/v6.2.2/sbom-desktop-v6.2.2.json) | Released: 2026-05-15<br/>Support Ends: 2027-05-15 {ref}`EXTENDED <release-types>` | {ref}`v11.8 <release-v11.8-feature-release>`, {ref}`v11.7 <release-v11.7-extended-support-release>`, {ref}`v11.6 <release-v11.6-feature-release>`, {ref}`v11.5 <release-v11.5-feature-release>`, {ref}`v10.11 <release-v10.11-extended-support-release>` |
+| v6.2 [Download](https://github.com/mattermost/desktop/releases/tag/v6.2.2) \| {ref}`Changelog <release-v6-2>` \| [SBOM download](https://github.com/mattermost/desktop/releases/download/v6.2.2/sbom-desktop-v6.2.2.json) | Released: 2026-05-15<br/>Support Ends: 2027-05-15 {ref}`EXTENDED <release-types>` | {ref}`v11.9 <release-v11.9-feature-release>`, {ref}`v11.8 <release-v11.8-feature-release>`, {ref}`v11.7 <release-v11.7-extended-support-release>`, {ref}`v11.6 <release-v11.6-feature-release>`, {ref}`v11.5 <release-v11.5-feature-release>`, {ref}`v10.11 <release-v10.11-extended-support-release>` |
 | v6.1 [Download](https://github.com/mattermost/desktop/releases/tag/v6.1.2) \| {ref}`Changelog <release-v6-1>` \| [SBOM download](https://github.com/mattermost/desktop/releases/download/v6.1.2/sbom-desktop-v6.1.2.json) | Released: 2026-03-02<br/>Support Ends: 2026-05-15 | {ref}`v11.6 <release-v11.6-feature-release>`, {ref}`v11.5 <release-v11.5-feature-release>`, {ref}`v11.4 <release-v11.4-feature-release>`, {ref}`v11.3 <release-v11.3-feature-release>`, {ref}`v11.2 <release-v11.2-feature-release>`, {ref}`v10.11 <release-v10.11-extended-support-release>` |
 | v6.0 [Download](https://github.com/mattermost/desktop/releases/tag/v6.0.4) \| {ref}`Changelog <release-v6-0>` \| [SBOM download](https://github.com/mattermost/desktop/releases/download/v6.0.4/sbom-desktop-v6.0.4.json) | Released: 2025-11-14<br/>Support Ends: 2026-03-15 | {ref}`v11.4 <release-v11.4-feature-release>`, {ref}`v11.3 <release-v11.3-feature-release>`, {ref}`v11.2 <release-v11.2-feature-release>`, {ref}`v11.1 <release-v11.1-feature-release>`, {ref}`v11.0 <release-v11.0-major-release>`, {ref}`v10.12 <release-v10.12-feature-release>`, {ref}`v10.11 <release-v10.11-extended-support-release>` |
 | v5.13 [Download](https://github.com/mattermost/desktop/releases/tag/v5.13.7) \| {ref}`Changelog <release-v5-13>` \| [SBOM download](https://github.com/mattermost/desktop/releases/download/v5.13.7/sbom-desktop-v5.13.7.json) | Released: 2025-08-15<br/>Support Ends: 2026-08-15 {ref}`EXTENDED <release-types>` | {ref}`v11.0 <release-v11.0-major-release>`, {ref}`v10.12 <release-v10.12-feature-release>`, {ref}`v10.11 <release-v10.11-extended-support-release>`, {ref}`v10.10 <release-v10.10-feature-release>`, {ref}`v10.9 <release-v10.9-feature-release>`, {ref}`v10.5 <release-v10.5-extended-support-release>` |

diff --git a/source/product-overview/mattermost-server-releases.md b/source/product-overview/mattermost-server-releases.md
@@ -19,6 +19,7 @@ Mattermost releases a new server version on the 16th of each month in [binary fo
 
 | **Release** | **Released on** | **Support ends** |
 |:---|:---|:---|
+| v11.9 [Download](https://releases.mattermost.com/11.9.0/mattermost-11.9.0-linux-amd64.tar.gz) \| {ref}`Changelog <release-v11.9-feature-release>` \| <details class="mm-sbom"><summary>SBOM</summary><ul><li><a href="https://github.com/mattermost/mattermost/releases/download/v11.9.0/sbom-mattermost-v11.9.0.json">Team Edition</a></li><li><a href="https://releases.mattermost.com/11.9.0/sbom-enterprise-v11.9.0.json">Enterprise</a></li></ul></details> | 2026-07-16 | 2026-10-15 |
 | v11.8 [Download](https://releases.mattermost.com/11.8.2/mattermost-11.8.2-linux-amd64.tar.gz) \| {ref}`Changelog <release-v11.8-feature-release>` \| <details class="mm-sbom"><summary>SBOM</summary><ul><li><a href="https://github.com/mattermost/mattermost/releases/download/v11.8.2/sbom-mattermost-v11.8.2.json">Team Edition</a></li><li><a href="https://releases.mattermost.com/11.8.2/sbom-enterprise-v11.8.2.json">Enterprise</a></li></ul></details> | 2026-06-16 | 2026-09-15 |
 | v11.7 [Download](https://releases.mattermost.com/11.7.6/mattermost-11.7.6-linux-amd64.tar.gz) \| {ref}`Changelog <release-v11.7-extended-support-release>` \| <details class="mm-sbom"><summary>SBOM</summary><ul><li><a href="https://github.com/mattermost/mattermost/releases/download/v11.7.6/sbom-mattermost-v11.7.6.json">Team Edition</a></li><li><a href="https://releases.mattermost.com/11.7.6/sbom-enterprise-v11.7.6.json">Enterprise</a></li></ul></details> | 2026-05-15 | 2027-05-15 {ref}`EXTENDED <release-types>` |
 | v11.6 [Download](https://releases.mattermost.com/11.6.6/mattermost-11.6.6-linux-amd64.tar.gz) \| {ref}`Changelog <release-v11.6-feature-release>` \| <details class="mm-sbom"><summary>SBOM</summary><ul><li><a href="https://github.com/mattermost/mattermost/releases/download/v11.6.6/sbom-mattermost-v11.6.6.json">Team Edition</a></li><li><a href="https://releases.mattermost.com/11.6.6/sbom-enterprise-v11.6.6.json">Enterprise</a></li></ul></details> | 2026-04-16 | 2026-07-15 |

diff --git a/source/product-overview/release-policy.md b/source/product-overview/release-policy.md
@@ -57,10 +57,11 @@ gantt
     v11.3                  :done, 2026-01-16, 2026-04-15
     v11.4                  :done, 2026-02-16, 2026-05-15
     v11.5                  :done, 2026-03-16, 2026-06-15
-    v11.6                  :active, 2026-04-16, 2026-07-15
+    v11.6                  :done, 2026-04-16, 2026-07-15
     v11.7 & Desktop App v6.2 Extended Support :crit,    2026-05-15, 2027-05-15
     v11.8                  :active, 2026-06-16, 2026-09-15
     v11.9                  :active, 2026-07-16, 2026-10-15
+    v11.10                 :active, 2026-08-16, 2026-11-15
 ```
 
 **Timeline Legend:**

diff --git a/source/product-overview/ui-ada-changelog.rst b/source/product-overview/ui-ada-changelog.rst
@@ -12,6 +12,22 @@ Changelog
 
    * - Version
      - Change Description
+   * - v11.9
+     - (UI) Added zoom and pan support to the image file preview: use the scroll wheel to zoom at the cursor, click-and-drag to pan, and +/-/0 keyboard shortcuts (reported on webapp).
+   * - v11.9
+     - (UI) Added a toast notification for plugin-rejected file uploads, consistent with the existing notification for rejected downloads.
+   * - v11.9
+     - (UI) Added a Data Spillage Handling feature discovery page in the System Console for lower-tier licenses.
+   * - v11.9
+     - (UI) Added clearer validation messaging for invalid user attribute names in the System Console.
+   * - v11.9
+     - (UI) Incoming webhooks now show information about the last time they were triggered.
+   * - v11.9
+     - (UI) Threads started by a webhook are no longer highlighted for the user who owns the webhook.
+   * - v11.9
+     - (UI) Added user setting "Auto-follow threads on channel-wide mentions" (Settings → Notifications). When disabled, @channel/@all/@here mentions no longer force thread membership; users still receive mention notifications but must manually follow the thread.
+   * - v11.9
+     - (UI) Hardened the web app against crashes caused by components rendered by a plugin.
    * - v11.8
      - (UI) Added a new keyboard shortcut, ``Shift`` + ``ESC``, that marks all channels, threads, and direct messages as read for a team on webapp / desktop app.
    * - v11.8