diff --git a/changelog.mdx b/changelog.mdx
index b965396ee..47fbb0909 100644
--- a/changelog.mdx
+++ b/changelog.mdx
@@ -7,6 +7,22 @@ keywords: ["changelog", "API updates", "release notes", "what's new", "API chang
 
 To subscribe to updates, please [**“Turn on notifications”**](https://help.x.com/en/managing-your-account/notifications-on-mobile-devices#:~:text=In%20the%20top%20menu,%20you,you%20would%20like%20to%20receive) for [**@API**](https://x.com/api). You can also follow this changelog in your feed reader via the [**RSS feed**](https://docs.x.com/changelog/rss.xml).
 
+<Update label="Sep 6, 2026" description="X API v2">
+  ### OAuth 2.0 user context for webhook and X Activity subscription management
+
+  We added OAuth 2.0 user context as a supported authentication method on the [webhook management endpoints](/x-api/webhooks/introduction) (`GET /2/webhooks`, `POST /2/webhooks`, `PUT /2/webhooks/{webhook_id}`, `DELETE /2/webhooks/{webhook_id}`) and on the [X Activity API](/x-api/activity/introduction) subscription endpoints `PUT /2/activity/subscriptions/{subscription_id}` and `DELETE /2/activity/subscriptions/{subscription_id}`.
+
+  You can now manage webhooks and update or delete Activity subscriptions with OAuth 2.0 user tokens, in addition to the previously supported methods. No changes are required to existing integrations.
+</Update>
+
+<Update label="Sep 2, 2026" description="X API v2">
+  ### Lower streaming latency: P99 now ~4-5 seconds
+
+  We improved delivery latency on the [high-volume streaming endpoints](/x-api/fundamentals/consuming-streaming-data), including the [Filtered Stream](/x-api/posts/filtered-stream/introduction). P99 latency is now approximately **4-5 seconds**, down from ~6-7 seconds.
+
+  No action is needed. If you need the lowest possible latency, see [Powerstream](/x-api/powerstream/introduction).
+</Update>
+
 <Update label="Sep 1, 2026" description="X API v2">
   ### Media upload and Post-create size and duration limits