diff --git a/CHANGES.rst b/CHANGES.rst
index 3a2a30873..4047f50aa 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,3 +1,15 @@
+Changes in synapse v0.31.1 (2018-06-08)
+=======================================
+
+v0.31.1 fixes a security bug in the ``get_missing_events`` federation API
+where event visibility rules were not applied correctly.
+
+We are not aware of it being actively exploited but please upgrade asap.
+
+Bug Fixes:
+
+* Fix event filtering in get_missing_events handler (PR #3371)
+
 Changes in synapse v0.31.0 (2018-06-06)
 =======================================
 
diff --git a/synapse/__init__.py b/synapse/__init__.py
index ca113db43..78fc63aa4 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -16,4 +16,4 @@
 """ This is a reference implementation of a Matrix home server.
 """
 
-__version__ = "0.31.0"
+__version__ = "0.31.1"