diff --git a/CHANGES.md b/CHANGES.md
index a299110a6b..ce98ea050b 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,12 @@
+Synapse 0.33.2.1 (2018-09-06)
+=============================
+
+SECURITY FIXES
+--------------
+
+- Fix an issue where event signatures were not always correctly validated ([\#3796](https://github.com/matrix-org/synapse/issues/3796))
+- Fix an issue where server_acls could be circumvented for incoming events ([\#3796](https://github.com/matrix-org/synapse/issues/3796))
+
 Synapse 0.33.2 (2018-08-09)
 ===========================
 
diff --git a/synapse/__init__.py b/synapse/__init__.py
index a14d578e36..b9db2af0a0 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -17,4 +17,4 @@
 """ This is a reference implementation of a Matrix home server.
 """
 
-__version__ = "0.33.2"
+__version__ = "0.33.2.1"