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diff --git a/CHANGES.md b/CHANGES.md
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--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,24 @@
+Synapse 1.40.0rc3 (2021-08-09)
+==============================
+
+Features
+--------
+
+- Support [MSC3289: room version 8](https://github.com/matrix-org/matrix-doc/pull/3289). ([\#10449](https://github.com/matrix-org/synapse/issues/10449))
+
+
+Bugfixes
+--------
+
+- Mark the experimental room version from [MSC2716](https://github.com/matrix-org/matrix-doc/pull/2716) as unstable. ([\#10449](https://github.com/matrix-org/synapse/issues/10449))
+
+
+Improved Documentation
+----------------------
+
+- Fix broken links in `upgrade.md`. Contributed by @dklimpel. ([\#10543](https://github.com/matrix-org/synapse/issues/10543))
+
+
 Synapse 1.40.0rc2 (2021-08-04)
 ==============================