From 7e8a5871575941620cbb8748ed0b63633a9c1f34 Mon Sep 17 00:00:00 2001
From: Kenneth Hamilton <kenneth.hamilton@mostly.ai>
Date: Mon, 15 Dec 2025 09:02:20 +0100
Subject: [PATCH] release note 5.9.0

---
 pages/whats-new.mdx | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/pages/whats-new.mdx b/pages/whats-new.mdx
index f8ef812..765f0fa 100644
--- a/pages/whats-new.mdx
+++ b/pages/whats-new.mdx
@@ -8,6 +8,20 @@ import Image from 'next/image';
 
 # What's new in MOSTLY AI
 
+## 5.9.0
+
+### Integrations using OAuth to external services
+
+Now you can use OAuth to authenticate with external services with MOSTLY AI. Imagine being able to ask the MOSTLY AI Assistant to pull data from your various external services and use that data to train Generators, create Artifacts, or even generate Synthetic Datasets. Well you don't have to imagine anymore, because as of version 5.9.0, you can!
+
+### Resolved issues
+
+- {/* MSD-2317 */} Fix _Download data_ submenu issue
+
+### Upstream dependencies
+
+- Upgraded [Synthetic Data SDK](https://github.com/mostly-ai/mostlyai) to `5.9.2`, [Synthetic Data Engine](https://github.com/mostly-ai/mostlyai-engine) to `2.3.3`.
+
 ## 5.8.2
 
 ### Resolved issues