diff --git a/CHANGES.md b/CHANGES.md
index f379c994f0..f94bacc31b 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,64 @@
+# Synapse 1.89.0rc1 (2023-07-25)
+
+### Features
+
+- Add Unix Socket support for HTTP Replication Listeners. Document and provide usage instructions for utilizing Unix sockets in Synapse. Contributed by Jason Little. ([\#15708](https://github.com/matrix-org/synapse/issues/15708), [\#15924](https://github.com/matrix-org/synapse/issues/15924))
+- Allow `+` in Matrix IDs, per [MSC4009](https://github.com/matrix-org/matrix-spec-proposals/pull/4009). ([\#15911](https://github.com/matrix-org/synapse/issues/15911))
+- Support room version 11 from [MSC3820](https://github.com/matrix-org/matrix-spec-proposals/pull/3820). ([\#15912](https://github.com/matrix-org/synapse/issues/15912))
+- Allow configuring the set of workers to proxy outbound federation traffic through via `outbound_federation_restricted_to`. ([\#15913](https://github.com/matrix-org/synapse/issues/15913), [\#15969](https://github.com/matrix-org/synapse/issues/15969))
+- Implement [MSC3814](https://github.com/matrix-org/matrix-spec-proposals/pull/3814), dehydrated devices v2/shrivelled sessions and move [MSC2697](https://github.com/matrix-org/matrix-spec-proposals/pull/2697) behind a config flag. Contributed by Nico from Famedly and H-Shay. ([\#15929](https://github.com/matrix-org/synapse/issues/15929))
+
+### Bugfixes
+
+- Fix long-standing bug where remote invites weren't correctly pushed. ([\#15820](https://github.com/matrix-org/synapse/issues/15820))
+- Fix a bug introduced in 1.86.0 where Synapse starting with an empty `experimental_features` configuration setting. ([\#15925](https://github.com/matrix-org/synapse/issues/15925))
+- Fixed deploy annotations in the provided Grafana dashboard config, so that it shows for any homeserver and not just matrix.org. Contributed by @wrjlewis. ([\#15957](https://github.com/matrix-org/synapse/issues/15957))
+- Properly handle redactions of creation events. ([\#15973](https://github.com/matrix-org/synapse/issues/15973))
+- Fix bug where resyncing stale device lists could block responding to federation transactions, and thus delay receiving new data from the remote server. ([\#15975](https://github.com/matrix-org/synapse/issues/15975))
+
+### Improved Documentation
+
+- Better clarify how to run a worker instance (pass both configs). ([\#15921](https://github.com/matrix-org/synapse/issues/15921))
+- Improve the documentation for the login as a user admin API. ([\#15938](https://github.com/matrix-org/synapse/issues/15938))
+- Fix broken Arch Linux package link. Contributed by @SnipeXandrej. ([\#15981](https://github.com/matrix-org/synapse/issues/15981))
+
+### Deprecations and Removals
+
+- Remove support for calling the `/register` endpoint with an unspecced `user` property for application services. ([\#15928](https://github.com/matrix-org/synapse/issues/15928))
+
+### Internal Changes
+
+- Mark `get_user_in_directory` private since it is only used in tests. Also remove the cache from it. ([\#15884](https://github.com/matrix-org/synapse/issues/15884))
+- Fix background schema updates failing over a large upgrade gap. ([\#15887](https://github.com/matrix-org/synapse/issues/15887))
+- Document which Python version runs on a given Linux distribution so we can more easily clean up later. ([\#15909](https://github.com/matrix-org/synapse/issues/15909))
+- Add details to warning in log when we fail to fetch an alias. ([\#15922](https://github.com/matrix-org/synapse/issues/15922))
+- Remove unneeded `__init__`. ([\#15926](https://github.com/matrix-org/synapse/issues/15926))
+- Fix bug with read/write lock implementation. This is currently unused so has no observable effects. ([\#15933](https://github.com/matrix-org/synapse/issues/15933), [\#15958](https://github.com/matrix-org/synapse/issues/15958))
+- Unbreak the nix development environment by pinning the Rust version to 1.70.0. ([\#15940](https://github.com/matrix-org/synapse/issues/15940))
+- Update presence metrics to differentiate remote vs local users. ([\#15952](https://github.com/matrix-org/synapse/issues/15952))
+- Stop reading from column `user_id` of table `profiles`. ([\#15955](https://github.com/matrix-org/synapse/issues/15955))
+- Ensure a long state res does not starve CPU by occasionally yielding to the reactor. ([\#15960](https://github.com/matrix-org/synapse/issues/15960))
+- Build packages for Debian Trixie. ([\#15961](https://github.com/matrix-org/synapse/issues/15961))
+- Reduce the amount of state we pull out. ([\#15968](https://github.com/matrix-org/synapse/issues/15968))
+- Speed up updating state in large rooms. ([\#15971](https://github.com/matrix-org/synapse/issues/15971))
+
+### Updates to locked dependencies
+
+* Bump anyhow from 1.0.71 to 1.0.72. ([\#15949](https://github.com/matrix-org/synapse/issues/15949))
+* Bump click from 8.1.3 to 8.1.6. ([\#15984](https://github.com/matrix-org/synapse/issues/15984))
+* Bump cryptography from 41.0.1 to 41.0.2. ([\#15943](https://github.com/matrix-org/synapse/issues/15943))
+* Bump jsonschema from 4.17.3 to 4.18.3. ([\#15948](https://github.com/matrix-org/synapse/issues/15948))
+* Bump pillow from 9.4.0 to 10.0.0. ([\#15986](https://github.com/matrix-org/synapse/issues/15986))
+* Bump prometheus-client from 0.17.0 to 0.17.1. ([\#15945](https://github.com/matrix-org/synapse/issues/15945))
+* Bump pydantic from 1.10.10 to 1.10.11. ([\#15946](https://github.com/matrix-org/synapse/issues/15946))
+* Bump pygithub from 1.58.2 to 1.59.0. ([\#15834](https://github.com/matrix-org/synapse/issues/15834))
+* Bump pyo3-log from 0.8.2 to 0.8.3. ([\#15951](https://github.com/matrix-org/synapse/issues/15951))
+* Bump sentry-sdk from 1.26.0 to 1.28.1. ([\#15985](https://github.com/matrix-org/synapse/issues/15985))
+* Bump serde_json from 1.0.100 to 1.0.103. ([\#15950](https://github.com/matrix-org/synapse/issues/15950))
+* Bump types-pillow from 9.5.0.4 to 10.0.0.1. ([\#15932](https://github.com/matrix-org/synapse/issues/15932))
+* Bump types-requests from 2.31.0.1 to 2.31.0.2. ([\#15983](https://github.com/matrix-org/synapse/issues/15983))
+* Bump typing-extensions from 4.5.0 to 4.7.1. ([\#15947](https://github.com/matrix-org/synapse/issues/15947))
+
 # Synapse 1.88.0 (2023-07-18)
 
 This release
diff --git a/changelog.d/15708.feature b/changelog.d/15708.feature
deleted file mode 100644
index 06a6c959ab..0000000000
--- a/changelog.d/15708.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add Unix Socket support for HTTP Replication Listeners. Document and provide usage instructions for utilizing Unix sockets in Synapse. Contributed by Jason Little.
diff --git a/changelog.d/15820.bugfix b/changelog.d/15820.bugfix
deleted file mode 100644
index d259d32061..0000000000
--- a/changelog.d/15820.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix long-standing bug where remote invites weren't correctly pushed.
diff --git a/changelog.d/15884.misc b/changelog.d/15884.misc
deleted file mode 100644
index 8e73a9a6cd..0000000000
--- a/changelog.d/15884.misc
+++ /dev/null
@@ -1 +0,0 @@
-Mark `get_user_in_directory` private since it is only used in tests. Also remove the cache from it.
diff --git a/changelog.d/15887.misc b/changelog.d/15887.misc
deleted file mode 100644
index 7c1005078e..0000000000
--- a/changelog.d/15887.misc
+++ /dev/null
@@ -1 +0,0 @@
-Fix background schema updates failing over a large upgrade gap.
diff --git a/changelog.d/15909.misc b/changelog.d/15909.misc
deleted file mode 100644
index ba36a97442..0000000000
--- a/changelog.d/15909.misc
+++ /dev/null
@@ -1 +0,0 @@
-Document which Python version runs on a given Linux distribution so we can more easily clean up later.
diff --git a/changelog.d/15911.feature b/changelog.d/15911.feature
deleted file mode 100644
index b24077c6c3..0000000000
--- a/changelog.d/15911.feature
+++ /dev/null
@@ -1 +0,0 @@
-Allow `+` in Matrix IDs, per [MSC4009](https://github.com/matrix-org/matrix-spec-proposals/pull/4009).
diff --git a/changelog.d/15912.feature b/changelog.d/15912.feature
deleted file mode 100644
index 0faed11eda..0000000000
--- a/changelog.d/15912.feature
+++ /dev/null
@@ -1 +0,0 @@
-Support room version 11 from [MSC3820](https://github.com/matrix-org/matrix-spec-proposals/pull/3820).
diff --git a/changelog.d/15913.feature b/changelog.d/15913.feature
deleted file mode 100644
index 0d77fae2dc..0000000000
--- a/changelog.d/15913.feature
+++ /dev/null
@@ -1 +0,0 @@
-Allow configuring the set of workers to proxy outbound federation traffic through via `outbound_federation_restricted_to`.
diff --git a/changelog.d/15921.doc b/changelog.d/15921.doc
deleted file mode 100644
index 02f34c73d5..0000000000
--- a/changelog.d/15921.doc
+++ /dev/null
@@ -1 +0,0 @@
-Better clarify how to run a worker instance (pass both configs).
diff --git a/changelog.d/15922.misc b/changelog.d/15922.misc
deleted file mode 100644
index 93fc644877..0000000000
--- a/changelog.d/15922.misc
+++ /dev/null
@@ -1 +0,0 @@
-Add details to warning in log when we fail to fetch an alias.
diff --git a/changelog.d/15924.feature b/changelog.d/15924.feature
deleted file mode 100644
index 06a6c959ab..0000000000
--- a/changelog.d/15924.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add Unix Socket support for HTTP Replication Listeners. Document and provide usage instructions for utilizing Unix sockets in Synapse. Contributed by Jason Little.
diff --git a/changelog.d/15925.bugfix b/changelog.d/15925.bugfix
deleted file mode 100644
index e3ef783576..0000000000
--- a/changelog.d/15925.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a bug introduced in 1.86.0 where Synapse starting with an empty `experimental_features` configuration setting.
diff --git a/changelog.d/15926.misc b/changelog.d/15926.misc
deleted file mode 100644
index bf4c0fa5d0..0000000000
--- a/changelog.d/15926.misc
+++ /dev/null
@@ -1 +0,0 @@
-Remove unneeded `__init__`.
diff --git a/changelog.d/15928.removal b/changelog.d/15928.removal
deleted file mode 100644
index 5563213d31..0000000000
--- a/changelog.d/15928.removal
+++ /dev/null
@@ -1 +0,0 @@
-Remove support for calling the `/register` endpoint with an unspecced `user` property for application services.
diff --git a/changelog.d/15929.feature b/changelog.d/15929.feature
deleted file mode 100644
index c3aaeae66e..0000000000
--- a/changelog.d/15929.feature
+++ /dev/null
@@ -1 +0,0 @@
-Implement [MSC3814](https://github.com/matrix-org/matrix-spec-proposals/pull/3814), dehydrated devices v2/shrivelled sessions and move [MSC2697](https://github.com/matrix-org/matrix-spec-proposals/pull/2697) behind a config flag. Contributed by Nico from Famedly and H-Shay.
diff --git a/changelog.d/15933.misc b/changelog.d/15933.misc
deleted file mode 100644
index 8457994c68..0000000000
--- a/changelog.d/15933.misc
+++ /dev/null
@@ -1 +0,0 @@
-Fix bug with read/write lock implementation. This is currently unused so has no observable effects.
diff --git a/changelog.d/15938.doc b/changelog.d/15938.doc
deleted file mode 100644
index 8d99e5f4ea..0000000000
--- a/changelog.d/15938.doc
+++ /dev/null
@@ -1 +0,0 @@
-Improve the documentation for the login as a user admin API.
diff --git a/changelog.d/15940.misc b/changelog.d/15940.misc
deleted file mode 100644
index eac008eb3e..0000000000
--- a/changelog.d/15940.misc
+++ /dev/null
@@ -1 +0,0 @@
-Unbreak the nix development environment by pinning the Rust version to 1.70.0.
\ No newline at end of file
diff --git a/changelog.d/15952.misc b/changelog.d/15952.misc
deleted file mode 100644
index c4160977cb..0000000000
--- a/changelog.d/15952.misc
+++ /dev/null
@@ -1 +0,0 @@
-Update presence metrics to differentiate remote vs local users.
diff --git a/changelog.d/15955.misc b/changelog.d/15955.misc
deleted file mode 100644
index dc4f687e0a..0000000000
--- a/changelog.d/15955.misc
+++ /dev/null
@@ -1 +0,0 @@
-Stop reading from column `user_id` of table `profiles`.
diff --git a/changelog.d/15957.bugfix b/changelog.d/15957.bugfix
deleted file mode 100644
index edbe2a956a..0000000000
--- a/changelog.d/15957.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fixed deploy annotations in the provided Grafana dashboard config, so that it shows for any homeserver and not just matrix.org. Contributed by @wrjlewis.
\ No newline at end of file
diff --git a/changelog.d/15958.misc b/changelog.d/15958.misc
deleted file mode 100644
index 8457994c68..0000000000
--- a/changelog.d/15958.misc
+++ /dev/null
@@ -1 +0,0 @@
-Fix bug with read/write lock implementation. This is currently unused so has no observable effects.
diff --git a/changelog.d/15960.misc b/changelog.d/15960.misc
deleted file mode 100644
index 7cac24a3c5..0000000000
--- a/changelog.d/15960.misc
+++ /dev/null
@@ -1 +0,0 @@
-Ensure a long state res does not starve CPU by occasionally yielding to the reactor.
diff --git a/changelog.d/15961.misc b/changelog.d/15961.misc
deleted file mode 100644
index 035a330446..0000000000
--- a/changelog.d/15961.misc
+++ /dev/null
@@ -1 +0,0 @@
-Build packages for Debian Trixie.
diff --git a/changelog.d/15968.misc b/changelog.d/15968.misc
deleted file mode 100644
index af7132cc72..0000000000
--- a/changelog.d/15968.misc
+++ /dev/null
@@ -1 +0,0 @@
-Reduce the amount of state we pull out.
diff --git a/changelog.d/15969.feature b/changelog.d/15969.feature
deleted file mode 100644
index 0d77fae2dc..0000000000
--- a/changelog.d/15969.feature
+++ /dev/null
@@ -1 +0,0 @@
-Allow configuring the set of workers to proxy outbound federation traffic through via `outbound_federation_restricted_to`.
diff --git a/changelog.d/15971.misc b/changelog.d/15971.misc
deleted file mode 100644
index 4afd8922fc..0000000000
--- a/changelog.d/15971.misc
+++ /dev/null
@@ -1 +0,0 @@
-Speed up updating state in large rooms.
diff --git a/changelog.d/15973.bugfix b/changelog.d/15973.bugfix
deleted file mode 100644
index c9280d0037..0000000000
--- a/changelog.d/15973.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Properly handle redactions of creation events.
diff --git a/changelog.d/15975.bugfix b/changelog.d/15975.bugfix
deleted file mode 100644
index 59738cca0a..0000000000
--- a/changelog.d/15975.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix bug where resyncing stale device lists could block responding to federation transactions, and thus delay receiving new data from the remote server.
diff --git a/changelog.d/15981.doc b/changelog.d/15981.doc
deleted file mode 100644
index 374a5bd12f..0000000000
--- a/changelog.d/15981.doc
+++ /dev/null
@@ -1 +0,0 @@
-Fix broken Arch Linux package link. Contributed by @SnipeXandrej.
diff --git a/debian/changelog b/debian/changelog
index a369e0e5c2..384edbdab1 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.89.0~rc1) stable; urgency=medium
+
+  * New Synapse release 1.89.0rc1.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 25 Jul 2023 14:31:07 +0200
+
 matrix-synapse-py3 (1.88.0) stable; urgency=medium
 
   * New Synapse release 1.88.0.
diff --git a/pyproject.toml b/pyproject.toml
index 4382ff38e5..89c5edb4db 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -89,7 +89,7 @@ manifest-path = "rust/Cargo.toml"
 
 [tool.poetry]
 name = "matrix-synapse"
-version = "1.88.0"
+version = "1.89.0rc1"
 description = "Homeserver for the Matrix decentralised comms protocol"
 authors = ["Matrix.org Team and Contributors <packages@matrix.org>"]
 license = "Apache-2.0"