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@@ -85,6 +85,17 @@ process, for example:
     dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
     ```
 
+# Upgrading to v1.52.0
+
+## Twisted security release
+
+During the making of this release, the developers of Twisted have released
+[Twisted 22.1.0](https://github.com/twisted/twisted/releases/tag/twisted-22.1.0), which
+fixes [a security issue](https://github.com/twisted/twisted/security/advisories/GHSA-92x2-jw7w-xvvx)
+within Twisted. We do not believe Synapse to be vulnerable to any security problem caused
+by this issue, though we advise server administrators to update their local version of
+Twisted if they can.
+
 # Upgrading to v1.51.0
 
 ## Deprecation of `webclient` listeners and non-HTTP(S) `web_client_location`