diff --git a/CHANGES.md b/CHANGES.md
index fcb50cd8c2..a17734cfe3 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,8 @@
+# Synapse 1.91.0 (2023-08-30)
+
+No significant changes since 1.91.0rc1.
+
+
 # Synapse 1.91.0rc1 (2023-08-23)
 
 ### Features
diff --git a/debian/changelog b/debian/changelog
index 8b0615e421..9c0f77e16a 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.91.0) stable; urgency=medium
+
+  * New Synapse release 1.91.0.
+
+ -- Synapse Packaging team <packages@matrix.org>  Wed, 30 Aug 2023 11:18:10 +0100
+
 matrix-synapse-py3 (1.91.0~rc1) stable; urgency=medium
 
   * New Synapse release 1.91.0rc1.
diff --git a/pyproject.toml b/pyproject.toml
index c2421d7257..2a4ff1ea01 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -89,7 +89,7 @@ manifest-path = "rust/Cargo.toml"
 
 [tool.poetry]
 name = "matrix-synapse"
-version = "1.91.0rc1"
+version = "1.91.0"
 description = "Homeserver for the Matrix decentralised comms protocol"
 authors = ["Matrix.org Team and Contributors <packages@matrix.org>"]
 license = "Apache-2.0"