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@@ -106,6 +106,14 @@ You will need to ensure `synctl` is on your `PATH`.
     automatically, though you might need to activate a virtual environment
     depending on how you installed Synapse.
 
+
+## Compatibility dropped for Mjolnir 1.3.1 and earlier
+
+Synapse v1.55.0 drops support for Mjolnir 1.3.1 and earlier.
+If you use the Mjolnir module to moderate your homeserver,
+please upgrade Mjolnir to version 1.3.2 or later before upgrading Synapse.
+
+
 # Upgrading to v1.54.0
 
 ## Legacy structured logging configuration removal