diff --git a/CHANGELOG b/CHANGELOG
index cf0d7d4..af6140d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -394,3 +394,14 @@
 * Update Synapse to 1.32.2
 * Fix a regression in Synapse 1.32.0 and 1.32.1 which caused LoggingContext errors in plugins. (#9857)
 
+[1.23.0]
+* Update Synapse to 1.33.0
+* Update experimental support for MSC3083: restricting room access via group membership. (#9800, #9814)
+* Add experimental support for handling presence on a worker. (#9819, #9820, #9828, #9850)
+* Return a new template when an user attempts to renew their account multiple times with the same token, stating that their account is set to expire. This replaces the invalid token template that would previously be shown in this case. This change concerns the optional account validity feature. (#9832)
+* Fixes the OIDC SSO flow when using a public_baseurl value including a non-root URL path. (#9726)
+* Fix thumbnail generation for some sites with non-standard content types. Contributed by @rkfg. (#9788)
+* Add some sanity checks to identity server passed to 3PID bind/unbind endpoints. (#9802)
+* Limit the size of HTTP responses read over federation. (#9833)
+* Fix a bug which could cause Synapse to get stuck in a loop of resyncing device lists. (#9867)
+* Fix a long-standing bug where errors from federation did not propagate to the client. (#9868)
diff --git a/CloudronManifest.json b/CloudronManifest.json
index a4ae4f9..602eec0 100644
--- a/CloudronManifest.json
+++ b/CloudronManifest.json
@@ -5,7 +5,7 @@
   "description": "file://DESCRIPTION.md",
   "changelog": "file://CHANGELOG",
   "tagline": "Secure & decentralized communication",
-  "version": "1.22.4",
+  "version": "1.23.0",
   "healthCheckPath": "/",
   "httpPort": 8008,
   "memoryLimit": 536870912,
diff --git a/DESCRIPTION.md b/DESCRIPTION.md
index ae595cc..0df9c2d 100644
--- a/DESCRIPTION.md
+++ b/DESCRIPTION.md
@@ -1,4 +1,4 @@
-This app packages Synapse <upstream>1.32.2</upstream>.
+This app packages Synapse <upstream>1.33.0</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
diff --git a/Dockerfile b/Dockerfile
index 6a02bd7..f27fc02 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,7 @@ RUN virtualenv -p python3 /app/code/env
 ENV VIRTUAL_ENV=/app/code/env
 ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 
-ARG VERSION=v1.32.2
+ARG VERSION=v1.33.0
 
 # Synapse (https://github.com/matrix-org/synapse/blob/master/INSTALL.md)
 # lxml - required for previews