diff --git a/CHANGES.md b/CHANGES.md
index 523cdb1153..f4a3ab71ca 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,9 @@
+Synapse 1.0.0rc3 (2019-06-10)
+=============================
+
+Security: Fix authentication bug introduced in 1.0.0rc1. Please upgrade to rc3 immediately
+
+
 Synapse 1.0.0rc2 (2019-06-10)
 =============================
 
diff --git a/synapse/__init__.py b/synapse/__init__.py
index 8dc07fe73c..9c75a0a27f 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -27,4 +27,4 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.0.0rc2"
+__version__ = "1.0.0rc3"