diff --git a/UPDATING.md b/UPDATING.md
index 5241c54ddb9..abfa11e186f 100644
--- a/UPDATING.md
+++ b/UPDATING.md
@@ -24,15 +24,7 @@ assists people when migrating to a new version.
 
 ## Next
 
-### Slack v1 deprecated; `ALERT_REPORT_SLACK_V2` defaults to `True`
-
-The legacy Slack integration for Alerts and Reports (`Slack` recipient type, `files.upload` API) is deprecated and will be removed in the next major release. The `ALERT_REPORT_SLACK_V2` feature flag now defaults to `True`.
-
-**Why this is changing:** Slack retired the `files.upload` endpoint in 2025, so v1 sends that include screenshots, CSVs, or PDFs already fail at the API level. Only text-only `chat_postMessage` sends still succeed via the legacy path. The v2 integration uses `files_upload_v2` and stores stable channel IDs instead of mutable channel names.
-
-**Operator action required:** Grant your Slack bot the `channels:read` scope (and `groups:read` if you use private channels). With that scope in place, existing `Slack` recipients are auto-upgraded to `SlackV2` on their next successful send — channel names are resolved to channel IDs and the recipient row is rewritten in place. Recipients whose channels can't be resolved will continue to send via the v1 `chat_postMessage` path for text-only alerts until v1 is removed.
-
-**If you previously set `ALERT_REPORT_SLACK_V2: False` explicitly:** you'll see a one-shot `DeprecationWarning` and a `logger.warning` describing the action above. To suppress, remove the override or grant the scope and let the auto-upgrade run.
+- [39914](https://github.com/apache/superset/pull/39914) `ALERT_REPORT_SLACK_V2` now defaults to `True` and the legacy Slack v1 integration (`Slack` recipient type, `files.upload` API) is deprecated for removal in the next major. Slack retired `files.upload` in 2025, so v1 file-bearing sends already fail at the API level — only text-only `chat_postMessage` still works via the legacy path. Grant your Slack bot the `channels:read` scope (and `groups:read` for private channels) so existing `Slack` recipients can be auto-upgraded to `SlackV2` on next send. Operators who explicitly override the flag to `False` will see a one-shot `DeprecationWarning` plus a `logger.warning`; remove the override or grant the scope to clear it.
 
 ### Granular Export Controls