diff --git a/CHANGES.md b/CHANGES.md
index 84976ab2bd6963a286c80dec554dd897522a5cad..84711de448925413fc4418491c49755767a11e57 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,20 @@
+Synapse 1.20.0 (2020-09-22)
+===========================
+
+No significant changes since v1.20.0rc5.
+
+Removal warning
+---------------
+
+Historically, the [Synapse Admin
+API](https://github.com/matrix-org/synapse/tree/master/docs) has been
+accessible under the `/_matrix/client/api/v1/admin`,
+`/_matrix/client/unstable/admin`, `/_matrix/client/r0/admin` and
+`/_synapse/admin` prefixes. In a future release, we will be dropping support
+for accessing Synapse's Admin API using the `/_matrix/client/*` prefixes. This
+makes it easier for homeserver admins to lock down external access to the Admin
+API endpoints.
+
 Synapse 1.20.0rc5 (2020-09-18)
 ==============================
 
diff --git a/debian/changelog b/debian/changelog
index dbf01d6b1e24f291b34e26b84da5820fe276874e..ae548f9f33d2125ae52b9c7bf409cce32436c9af 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,8 +1,12 @@
-matrix-synapse-py3 (1.20.0ubuntu1) UNRELEASED; urgency=medium
+matrix-synapse-py3 (1.20.0) stable; urgency=medium
 
+  [ Synapse Packaging team ]
+  * New synapse release 1.20.0.
+
+  [ Dexter Chua ]
   * Use Type=notify in systemd service
 
- -- Dexter Chua <dec41@srcf.net>  Wed, 26 Aug 2020 12:41:36 +0000
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 22 Sep 2020 15:19:32 +0100
 
 matrix-synapse-py3 (1.19.3) stable; urgency=medium
 
diff --git a/synapse/__init__.py b/synapse/__init__.py
index a95753dcc741f555dcf46de353f15dab112f07c3..8242d05f600e1235dccb6b973be1d1ed61bc70f8 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -48,7 +48,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.20.0rc5"
+__version__ = "1.20.0"
 
 if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
     # We import here so that we don't have to install a bunch of deps when