diff --git a/CHANGES.md b/CHANGES.md
index d6f3d7cf33a..010424e0722 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,15 @@
+# Synapse 1.99.0 (2024-01-16)
+
+Synapse 1.99.0 is the first Synapse release under an AGPLv3.0 licence (with CLA to enable Element to sell AGPL
+exceptions). You can read more about this here:
+
+ - https://matrix.org/blog/2023/11/06/future-of-synapse-dendrite/
+ - https://element.io/blog/element-to-adopt-agplv3/
+ - https://element.io/blog/synapse-now-lives-at-github-com-element-hq-synapse/
+
+No significant changes since 1.99.0rc1.
+
+
 # Synapse 1.99.0rc1 (2024-01-09)
 
 ### Features
diff --git a/debian/changelog b/debian/changelog
index bca3ab92c77..8f1f7bb4aef 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,8 +1,9 @@
-matrix-synapse-py3 (1.99.0~rc1ubuntu1) UNRELEASED; urgency=medium
+matrix-synapse-py3 (1.99.0) stable; urgency=medium
 
   * Fix copyright file with new licensing
+  * New Synapse release 1.99.0.
 
- -- Synapse Packaging team <packages@matrix.org>  Thu, 11 Jan 2024 13:47:29 +0000
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 16 Jan 2024 11:58:34 +0000
 
 matrix-synapse-py3 (1.99.0~rc1) stable; urgency=medium
 
diff --git a/pyproject.toml b/pyproject.toml
index 734b11cc507..3c0a5cf5798 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -96,7 +96,7 @@ module-name = "synapse.synapse_rust"
 
 [tool.poetry]
 name = "matrix-synapse"
-version = "1.99.0rc1"
+version = "1.99.0"
 description = "Homeserver for the Matrix decentralised comms protocol"
 authors = ["Matrix.org Team and Contributors <packages@matrix.org>"]
 license = "AGPL-3.0-or-later"