diff --git a/CHANGES.md b/CHANGES.md
index d3cec9cc15..227129d00a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,53 @@
+# Synapse 1.115.0rc1 (2024-09-10)
+
+### Features
+
+- Improve cross-signing upload when using [MSC3861](https://github.com/matrix-org/matrix-spec-proposals/pull/3861) to use a custom UIA flow stage, with web fallback support. ([\#17509](https://github.com/element-hq/synapse/issues/17509))
+
+### Bugfixes
+
+- Return `400 M_BAD_JSON` upon attempting to complete various room actions with a non-local user ID and unknown room ID, rather than an internal server error. ([\#17607](https://github.com/element-hq/synapse/issues/17607))
+- Fix authenticated media responses using a wrong limit when following redirects over federation. ([\#17626](https://github.com/element-hq/synapse/issues/17626))
+- Fix bug where we returned the wrong `bump_stamp` for invites in sliding sync response, causing incorrect ordering of invites in the room list. ([\#17674](https://github.com/element-hq/synapse/issues/17674))
+
+### Improved Documentation
+
+- Clarify that the admin api resource is only loaded on the main process and not workers. ([\#17590](https://github.com/element-hq/synapse/issues/17590))
+- Fixed typo in `saml2_config` config [example](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#saml2_config). ([\#17594](https://github.com/element-hq/synapse/issues/17594))
+
+### Deprecations and Removals
+
+- Stabilise [MSC4156](https://github.com/matrix-org/matrix-spec-proposals/pull/4156) by removing the `msc4156_enabled` config setting and defaulting it to `true`. ([\#17650](https://github.com/element-hq/synapse/issues/17650))
+
+### Internal Changes
+
+- MSC3861: load the issuer and account management URLs from OIDC discovery. ([\#17407](https://github.com/element-hq/synapse/issues/17407))
+- Pre-populate room data used in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint for quick filtering/sorting. ([\#17512](https://github.com/element-hq/synapse/issues/17512), [\#17632](https://github.com/element-hq/synapse/issues/17632), [\#17633](https://github.com/element-hq/synapse/issues/17633), [\#17634](https://github.com/element-hq/synapse/issues/17634), [\#17635](https://github.com/element-hq/synapse/issues/17635), [\#17636](https://github.com/element-hq/synapse/issues/17636), [\#17641](https://github.com/element-hq/synapse/issues/17641), [\#17654](https://github.com/element-hq/synapse/issues/17654), [\#17673](https://github.com/element-hq/synapse/issues/17673))
+- Store sliding sync per-connection state in the database. ([\#17599](https://github.com/element-hq/synapse/issues/17599), [\#17631](https://github.com/element-hq/synapse/issues/17631))
+- Make the sliding sync `PerConnectionState` class immutable. ([\#17600](https://github.com/element-hq/synapse/issues/17600))
+- Replace `isort` and `black` with `ruff`. ([\#17620](https://github.com/element-hq/synapse/issues/17620), [\#17643](https://github.com/element-hq/synapse/issues/17643))
+- Sliding Sync: Split up `get_room_membership_for_user_at_to_token`. ([\#17629](https://github.com/element-hq/synapse/issues/17629))
+- Use new database tables for sliding sync. ([\#17630](https://github.com/element-hq/synapse/issues/17630), [\#17649](https://github.com/element-hq/synapse/issues/17649))
+- Prevent duplicate tags being added to Sliding Sync traces. ([\#17655](https://github.com/element-hq/synapse/issues/17655))
+- Get `bump_stamp` from [new sliding sync tables](https://github.com/element-hq/synapse/pull/17512) which should be faster. ([\#17658](https://github.com/element-hq/synapse/issues/17658))
+- Speed up incremental Sliding Sync requests by avoiding extra work. ([\#17665](https://github.com/element-hq/synapse/issues/17665))
+- Small performance improvement in speeding up sliding sync. ([\#17666](https://github.com/element-hq/synapse/issues/17666), [\#17670](https://github.com/element-hq/synapse/issues/17670), [\#17672](https://github.com/element-hq/synapse/issues/17672))
+- Speed up sliding sync by reducing number of database calls. ([\#17684](https://github.com/element-hq/synapse/issues/17684))
+- Speed up sync by pulling out fewer events from the database. ([\#17688](https://github.com/element-hq/synapse/issues/17688))
+
+
+
+### Updates to locked dependencies
+
+* Bump authlib from 1.3.1 to 1.3.2. ([\#17679](https://github.com/element-hq/synapse/issues/17679))
+* Bump idna from 3.7 to 3.8. ([\#17682](https://github.com/element-hq/synapse/issues/17682))
+* Bump ruff from 0.6.2 to 0.6.4. ([\#17680](https://github.com/element-hq/synapse/issues/17680))
+* Bump towncrier from 24.7.1 to 24.8.0. ([\#17645](https://github.com/element-hq/synapse/issues/17645))
+* Bump twisted from 24.7.0rc1 to 24.7.0. ([\#17647](https://github.com/element-hq/synapse/issues/17647))
+* Bump types-pillow from 10.2.0.20240520 to 10.2.0.20240822. ([\#17644](https://github.com/element-hq/synapse/issues/17644))
+* Bump types-psycopg2 from 2.9.21.20240417 to 2.9.21.20240819. ([\#17646](https://github.com/element-hq/synapse/issues/17646))
+* Bump types-setuptools from 71.1.0.20240818 to 74.1.0.20240907. ([\#17681](https://github.com/element-hq/synapse/issues/17681))
+
 # Synapse 1.114.0 (2024-09-02)
 
 This release enables support for
diff --git a/changelog.d/17407.misc b/changelog.d/17407.misc
deleted file mode 100644
index 9ed6e61a5b..0000000000
--- a/changelog.d/17407.misc
+++ /dev/null
@@ -1 +0,0 @@
-MSC3861: load the issuer and account management URLs from OIDC discovery.
diff --git a/changelog.d/17509.feature b/changelog.d/17509.feature
deleted file mode 100644
index 6d639ceb98..0000000000
--- a/changelog.d/17509.feature
+++ /dev/null
@@ -1 +0,0 @@
-Improve cross-signing upload when using [MSC3861](https://github.com/matrix-org/matrix-spec-proposals/pull/3861) to use a custom UIA flow stage, with web fallback support.
diff --git a/changelog.d/17512.misc b/changelog.d/17512.misc
deleted file mode 100644
index 756918e2b2..0000000000
--- a/changelog.d/17512.misc
+++ /dev/null
@@ -1 +0,0 @@
-Pre-populate room data used in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint for quick filtering/sorting.
diff --git a/changelog.d/17590.doc b/changelog.d/17590.doc
deleted file mode 100644
index eced3d96cb..0000000000
--- a/changelog.d/17590.doc
+++ /dev/null
@@ -1 +0,0 @@
-Clarify that the admin api resource is only loaded on the main process and not workers.
\ No newline at end of file
diff --git a/changelog.d/17594.doc b/changelog.d/17594.doc
deleted file mode 100644
index 95b0042005..0000000000
--- a/changelog.d/17594.doc
+++ /dev/null
@@ -1 +0,0 @@
-Fixed typo in `saml2_config` config [example](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#saml2_config).
diff --git a/changelog.d/17599.misc b/changelog.d/17599.misc
deleted file mode 100644
index 2f81356d12..0000000000
--- a/changelog.d/17599.misc
+++ /dev/null
@@ -1 +0,0 @@
-Store sliding sync per-connection state in the database.
diff --git a/changelog.d/17600.misc b/changelog.d/17600.misc
deleted file mode 100644
index a81c67f6d1..0000000000
--- a/changelog.d/17600.misc
+++ /dev/null
@@ -1 +0,0 @@
-Make the sliding sync `PerConnectionState` class immutable.
diff --git a/changelog.d/17607.bugfix b/changelog.d/17607.bugfix
deleted file mode 100644
index 74201135b6..0000000000
--- a/changelog.d/17607.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Return `400 M_BAD_JSON` upon attempting to complete various room actions with a non-local user ID and unknown room ID, rather than an internal server error.
\ No newline at end of file
diff --git a/changelog.d/17620.misc b/changelog.d/17620.misc
deleted file mode 100644
index f583cdcb38..0000000000
--- a/changelog.d/17620.misc
+++ /dev/null
@@ -1 +0,0 @@
-Replace `isort` and `black with `ruff`.
diff --git a/changelog.d/17626.bugfix b/changelog.d/17626.bugfix
deleted file mode 100644
index 1dbb2a2f45..0000000000
--- a/changelog.d/17626.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix authenticated media responses using a wrong limit when following redirects over federation.
diff --git a/changelog.d/17629.misc b/changelog.d/17629.misc
deleted file mode 100644
index 1eb46b2c68..0000000000
--- a/changelog.d/17629.misc
+++ /dev/null
@@ -1 +0,0 @@
-Sliding Sync: Split up `get_room_membership_for_user_at_to_token`.
diff --git a/changelog.d/17630.misc b/changelog.d/17630.misc
deleted file mode 100644
index ed1bf6bd55..0000000000
--- a/changelog.d/17630.misc
+++ /dev/null
@@ -1 +0,0 @@
-Use new database tables for sliding sync.
diff --git a/changelog.d/17631.misc b/changelog.d/17631.misc
deleted file mode 100644
index 2f81356d12..0000000000
--- a/changelog.d/17631.misc
+++ /dev/null
@@ -1 +0,0 @@
-Store sliding sync per-connection state in the database.
diff --git a/changelog.d/17632.misc b/changelog.d/17632.misc
deleted file mode 100644
index 756918e2b2..0000000000
--- a/changelog.d/17632.misc
+++ /dev/null
@@ -1 +0,0 @@
-Pre-populate room data used in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint for quick filtering/sorting.
diff --git a/changelog.d/17633.misc b/changelog.d/17633.misc
deleted file mode 100644
index 756918e2b2..0000000000
--- a/changelog.d/17633.misc
+++ /dev/null
@@ -1 +0,0 @@
-Pre-populate room data used in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint for quick filtering/sorting.
diff --git a/changelog.d/17634.misc b/changelog.d/17634.misc
deleted file mode 100644
index 756918e2b2..0000000000
--- a/changelog.d/17634.misc
+++ /dev/null
@@ -1 +0,0 @@
-Pre-populate room data used in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint for quick filtering/sorting.
diff --git a/changelog.d/17635.misc b/changelog.d/17635.misc
deleted file mode 100644
index 756918e2b2..0000000000
--- a/changelog.d/17635.misc
+++ /dev/null
@@ -1 +0,0 @@
-Pre-populate room data used in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint for quick filtering/sorting.
diff --git a/changelog.d/17636.misc b/changelog.d/17636.misc
deleted file mode 100644
index 756918e2b2..0000000000
--- a/changelog.d/17636.misc
+++ /dev/null
@@ -1 +0,0 @@
-Pre-populate room data used in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint for quick filtering/sorting.
diff --git a/changelog.d/17641.misc b/changelog.d/17641.misc
deleted file mode 100644
index 756918e2b2..0000000000
--- a/changelog.d/17641.misc
+++ /dev/null
@@ -1 +0,0 @@
-Pre-populate room data used in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint for quick filtering/sorting.
diff --git a/changelog.d/17643.misc b/changelog.d/17643.misc
deleted file mode 100644
index f583cdcb38..0000000000
--- a/changelog.d/17643.misc
+++ /dev/null
@@ -1 +0,0 @@
-Replace `isort` and `black with `ruff`.
diff --git a/changelog.d/17649.misc b/changelog.d/17649.misc
deleted file mode 100644
index ed1bf6bd55..0000000000
--- a/changelog.d/17649.misc
+++ /dev/null
@@ -1 +0,0 @@
-Use new database tables for sliding sync.
diff --git a/changelog.d/17650.removal b/changelog.d/17650.removal
deleted file mode 100644
index 1238815c08..0000000000
--- a/changelog.d/17650.removal
+++ /dev/null
@@ -1 +0,0 @@
-Stabilise [MSC4156](https://github.com/matrix-org/matrix-spec-proposals/pull/4156) by removing the `msc4156_enabled` config setting and defaulting it to `true`.
\ No newline at end of file
diff --git a/changelog.d/17654.misc b/changelog.d/17654.misc
deleted file mode 100644
index 756918e2b2..0000000000
--- a/changelog.d/17654.misc
+++ /dev/null
@@ -1 +0,0 @@
-Pre-populate room data used in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint for quick filtering/sorting.
diff --git a/changelog.d/17655.misc b/changelog.d/17655.misc
deleted file mode 100644
index ce997d3b41..0000000000
--- a/changelog.d/17655.misc
+++ /dev/null
@@ -1 +0,0 @@
-Prevent duplicate tags being added to Sliding Sync traces.
diff --git a/changelog.d/17658.misc b/changelog.d/17658.misc
deleted file mode 100644
index 0bdbc1140d..0000000000
--- a/changelog.d/17658.misc
+++ /dev/null
@@ -1 +0,0 @@
-Get `bump_stamp` from [new sliding sync tables](https://github.com/element-hq/synapse/pull/17512) which should be faster.
diff --git a/changelog.d/17665.misc b/changelog.d/17665.misc
deleted file mode 100644
index 28921087a6..0000000000
--- a/changelog.d/17665.misc
+++ /dev/null
@@ -1 +0,0 @@
-Speed up incremental Sliding Sync requests by avoiding extra work.
diff --git a/changelog.d/17666.misc b/changelog.d/17666.misc
deleted file mode 100644
index 3550679247..0000000000
--- a/changelog.d/17666.misc
+++ /dev/null
@@ -1 +0,0 @@
-Small performance improvement in speeding up sliding sync.
diff --git a/changelog.d/17670.misc b/changelog.d/17670.misc
deleted file mode 100644
index 3550679247..0000000000
--- a/changelog.d/17670.misc
+++ /dev/null
@@ -1 +0,0 @@
-Small performance improvement in speeding up sliding sync.
diff --git a/changelog.d/17672.misc b/changelog.d/17672.misc
deleted file mode 100644
index 3550679247..0000000000
--- a/changelog.d/17672.misc
+++ /dev/null
@@ -1 +0,0 @@
-Small performance improvement in speeding up sliding sync.
diff --git a/changelog.d/17673.misc b/changelog.d/17673.misc
deleted file mode 100644
index 756918e2b2..0000000000
--- a/changelog.d/17673.misc
+++ /dev/null
@@ -1 +0,0 @@
-Pre-populate room data used in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint for quick filtering/sorting.
diff --git a/changelog.d/17674.bugfix b/changelog.d/17674.bugfix
deleted file mode 100644
index bbef5005a1..0000000000
--- a/changelog.d/17674.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix bug where we returned the wrong `bump_stamp` for invites in sliding sync response, causing incorrect ordering of invites in the room list.
diff --git a/changelog.d/17684.misc b/changelog.d/17684.misc
deleted file mode 100644
index ecfb040a5f..0000000000
--- a/changelog.d/17684.misc
+++ /dev/null
@@ -1 +0,0 @@
-Speed up sliding sync by reducing number of database calls.
diff --git a/changelog.d/17688.misc b/changelog.d/17688.misc
deleted file mode 100644
index 7ba8d48fbe..0000000000
--- a/changelog.d/17688.misc
+++ /dev/null
@@ -1 +0,0 @@
-Speed up sync by pulling out fewer events from the database.
diff --git a/debian/changelog b/debian/changelog
index dfb48edc49..51b082205d 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.115.0~rc1) stable; urgency=medium
+
+  * New Synapse release 1.115.0rc1.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 10 Sep 2024 08:39:09 -0600
+
 matrix-synapse-py3 (1.114.0) stable; urgency=medium
 
   * New Synapse release 1.114.0.
diff --git a/pyproject.toml b/pyproject.toml
index e93179c9e0..bd139e2834 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -97,7 +97,7 @@ module-name = "synapse.synapse_rust"
 
 [tool.poetry]
 name = "matrix-synapse"
-version = "1.114.0"
+version = "1.115.0rc1"
 description = "Homeserver for the Matrix decentralised comms protocol"
 authors = ["Matrix.org Team and Contributors <packages@matrix.org>"]
 license = "AGPL-3.0-or-later"