diff --git a/CHANGES.md b/CHANGES.md
index ce3b0adae583a63f114a4749e2ad000a7bfe23c9..652f4b7955c104d5510973ec376c9ff2c995c2a8 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,12 @@
+Synapse 1.43.0 (2021-09-21)
+===========================
+
+This release drops support for the deprecated, unstable API for [MSC2858 (Multiple SSO Identity Providers)](https://github.com/matrix-org/matrix-doc/blob/master/proposals/2858-Multiple-SSO-Identity-Providers.md#unstable-prefix), as well as the undocumented `experimental.msc2858_enabled` config option. Client authors should update their clients to use the stable API, available since Synapse 1.30.
+
+The documentation has been updated with configuration for routing `/spaces`, `/hierarchy` and `/summary` to workers. See [the upgrade notes](https://github.com/matrix-org/synapse/blob/release-v1.43/docs/upgrade.md#upgrading-to-v1430) for more details.
+
+No significant changes since 1.43.0rc2.
+
Synapse 1.43.0rc2 (2021-09-17)
==============================
@@ -10,8 +19,6 @@ Bugfixes
Synapse 1.43.0rc1 (2021-09-14)
==============================
-This release drops support for the deprecated, unstable API for [MSC2858](https://github.com/matrix-org/matrix-doc/blob/master/proposals/2858-Multiple-SSO-Identity-Providers.md#unstable-prefix), as well as the undocumented `experimental.msc2858_enabled` config option. Client authors should update their clients to use the stable API, available since Synapse 1.30.
-
Features
--------
diff --git a/debian/changelog b/debian/changelog
index 7774cad55bec38fb72936839662c4a0daf38296c..4b07d0412875b91f09bbf89c25ae7d65edbce11b 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.43.0) stable; urgency=medium
+
+ * New synapse release 1.43.0.
+
+ -- Synapse Packaging team <packages@matrix.org> Tue, 21 Sep 2021 11:49:05 +0100
+
matrix-synapse-py3 (1.43.0~rc2) stable; urgency=medium
* New synapse release 1.43.0~rc2.
diff --git a/synapse/__init__.py b/synapse/__init__.py
index c9ef90ccaa5cecce14e25c943196f17272b12130..5f5cff1dfdcdf8c0ceeccc1051d1dca4250bbc31 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -47,7 +47,7 @@ try:
except ImportError:
pass
-__version__ = "1.43.0rc2"
+__version__ = "1.43.0"
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