diff --git a/changelog.mdx b/changelog.mdx
index b965396ee..b6be8151b 100644
--- a/changelog.mdx
+++ b/changelog.mdx
@@ -7,6 +7,14 @@ 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 7, 2026" description="X API v2">
+  ### Lower streaming latency and new authentication options
+
+  - **Faster streaming delivery**: [X API v2 streaming endpoints](/x-api/fundamentals/consuming-streaming-data) now deliver hydrated Post data with a P99 latency of approximately **4-5 seconds**, down from 6-7 seconds. This includes [filtered stream](/x-api/posts/filtered-stream/introduction). If you need the lowest possible latency, use [Powerstream](/x-api/powerstream/introduction).
+  - **OAuth 2.0 user context for webhooks**: The [webhooks management endpoints](/x-api/webhooks/introduction) (`GET` and `POST /2/webhooks`, `PUT` and `DELETE /2/webhooks/:webhook_id`) now accept OAuth 2.0 user context authentication. `GET /2/webhooks` also now accepts OAuth 1.0a user context.
+  - **More authentication options for X Activity API subscriptions**: `PUT` and `DELETE /2/activity/subscriptions/:subscription_id` now accept OAuth 1.0a and OAuth 2.0 user context in addition to the app-only Bearer Token. See the [X Activity API](/x-api/activity/introduction).
+</Update>
+
 <Update label="Sep 1, 2026" description="X API v2">
   ### Media upload and Post-create size and duration limits