diff --git a/CHANGELOG.md b/CHANGELOG.md
index b235c54..9c56107 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## v0.4.6 (2014-9-10)
+- Fix build for new 0.21 release of Cython. 0.21 is now the minimum supported version of Cython.
+
 ## v0.4.5 (2014-6-26)
 - Fix `to_dict` not converting enums to strings
 
diff --git a/setup.py b/setup.py
index 8a46376..0320c47 100644
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,7 @@ import os
 
 MAJOR = 0
 MINOR = 4
-MICRO = 5
+MICRO = 6
 VERSION = '%d.%d.%d' % (MAJOR, MINOR, MICRO)
 
 def write_version_py(filename=None):