diff --git a/CHANGES.md b/CHANGES.md
index 9ba9498344..c890f64d25 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,11 +1,14 @@
-Synapse 1.66.0
-==============
+Synapse 1.66.0 (2022-08-31)
+===========================
+
+No significant changes since 1.66.0rc2.
 
 Deployments with multiple workers should note that the direct TCP replication
 configuration was deprecated in Synapse v1.18.0 and will be removed in Synapse
 v1.67.0. See [docs/workers.md](https://github.com/matrix-org/synapse/blob/release-v1.18.0/docs/workers.md)
 for more details.
 
+
 Synapse 1.66.0rc2 (2022-08-30)
 ==============================
 
diff --git a/debian/changelog b/debian/changelog
index b42c99d81a..7ff1428842 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.66.0) stable; urgency=medium
+
+  * New Synapse release 1.66.0.
+
+ -- Synapse Packaging team <packages@matrix.org>  Wed, 31 Aug 2022 11:20:17 +0100
+
 matrix-synapse-py3 (1.66.0~rc2) stable; urgency=medium
 
   * New Synapse release 1.66.0rc2.
diff --git a/pyproject.toml b/pyproject.toml
index 7146897837..a41d88ea74 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,7 +54,7 @@ skip_gitignore = true
 
 [tool.poetry]
 name = "matrix-synapse"
-version = "1.66.0rc2"
+version = "1.66.0"
 description = "Homeserver for the Matrix decentralised comms protocol"
 authors = ["Matrix.org Team and Contributors <packages@matrix.org>"]
 license = "Apache-2.0"