diff --git a/CHANGELOG b/CHANGELOG
index 0ac716c..b8a32a7 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -580,3 +580,11 @@
 * Fix a bug introduced in Synapse 1.54.0rc1 preventing the new module callbacks introduced in this release from being registered by modules. (#12141)
 * Fix a bug introduced in Synapse 1.54.0rc1 where runtime dependency version checks would mistakenly check development dependencies if they were present and would not accept pre-release versions of dependencies. (#12129, #12177)
 
+[1.40.0]
+* Update Synapse to 1.55.0
+* [Full changelog](https://github.com/matrix-org/synapse/releases/tag/v1.55.0)
+* Add third-party rules callbacks check_can_shutdown_room and check_can_deactivate_user. (#12028)
+* Improve performance of logging in for large accounts. (#12132)
+* Support the stable identifiers from MSC3440: threads. (#12151)
+* Add a new Jinja2 template filter to extract the local part of an email address. (#12212)
+
diff --git a/CloudronManifest.json b/CloudronManifest.json
index d31fef6..111b8d0 100644
--- a/CloudronManifest.json
+++ b/CloudronManifest.json
@@ -5,8 +5,8 @@
   "description": "file://DESCRIPTION.md",
   "changelog": "file://CHANGELOG",
   "tagline": "Secure & decentralized communication",
-  "version": "1.39.0",
-  "upstreamVersion": "1.54.0",
+  "version": "1.40.0",
+  "upstreamVersion": "1.55.0",
   "healthCheckPath": "/",
   "httpPort": 8008,
   "memoryLimit": 536870912,
diff --git a/DESCRIPTION.md b/DESCRIPTION.md
index 259f987..91c1bf0 100644
--- a/DESCRIPTION.md
+++ b/DESCRIPTION.md
@@ -2,9 +2,9 @@
 [here](https://matrix.org/clients/). Riot is a popular web frontend for Matrix and
 is available as a separate app.**
 
-Matrix is an ambitious new ecosystem for open federated Instant Messaging and VoIP.
+## About
 
-## Matrix
+Matrix is an ambitious new ecosystem for open federated Instant Messaging and VoIP.
 
 Matrix specifies a set of pragmatic RESTful HTTP JSON APIs as an open standard, which handle:
 
@@ -16,7 +16,7 @@ Matrix specifies a set of pragmatic RESTful HTTP JSON APIs as an open standard,
 * Using 3rd Party IDs (3PIDs) such as email addresses, phone numbers, Facebook accounts to authenticate, identify and discover users on Matrix.
 * Placing 1:1 VoIP and Video calls
 
-## Synapse
+## What is Synapse?
 
 Synapse is a reference "homeserver" implementation of Matrix from the core development
 team at matrix.org, written in Python/Twisted.