diff --git a/CHANGELOG b/CHANGELOG
index 8ed24c1..69fdaad 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -133,3 +133,12 @@
 [1.3.0]
 * Add optional sso support
 
+[1.4.0]
+* Update Synapse to 1.15.1
+* [Full changelog](https://github.com/matrix-org/synapse/releases/tag/v1.15.0)
+* Advertise support for Client-Server API r0.6.0 and remove related unstable feature flags. (#6585)
+* Add an option to disable autojoining rooms for guest accounts. (#6637)
+* Add admin APIs to allow server admins to manage users' devices. Contributed by @dklimpel. (#7481)
+* Add support for generating thumbnails for WebP images. Previously, users would see an empty box instead of preview image. Contributed by @WGH-. (#7586)
+* Support the standardized m.login.sso user-interactive authentication flow. (#7630)
+
diff --git a/CloudronManifest.json b/CloudronManifest.json
index e1bd034..8739dfd 100644
--- a/CloudronManifest.json
+++ b/CloudronManifest.json
@@ -5,7 +5,7 @@
   "description": "file://DESCRIPTION.md",
   "changelog": "file://CHANGELOG",
   "tagline": "Secure & decentralized communication",
-  "version": "1.3.0",
+  "version": "1.4.0",
   "healthCheckPath": "/",
   "httpPort": 8008,
   "memoryLimit": 536870912,
diff --git a/DESCRIPTION.md b/DESCRIPTION.md
index a8a80c8..3138db8 100644
--- a/DESCRIPTION.md
+++ b/DESCRIPTION.md
@@ -1,4 +1,4 @@
-This app packages Synapse <upstream>1.14.0</upstream>.
+This app packages Synapse <upstream>1.15.1</upstream>.
 
 **This package only provides the Matrix backend. A variety of clients are available
 [here](https://matrix.org/clients/). Riot is a popular web frontend for Matrix and