diff --git a/CHANGES.rst b/CHANGES.rst
index a35ee1b..be48dcb 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,9 +1,12 @@
 Changes
 -------
 
-X.X.X (XXXX-XX-XX)
+0.5.0 (2017-12-03)
 ^^^^^^^^^^^^^^^^^^
 
+* Fix corner cases and deadlock when we upgrade lock from write to
+  read #39
+
 * Use loop.create_future instead asyncio.Future if possible
 
 0.4.0 (2015-09-20)
diff --git a/aiorwlock/__init__.py b/aiorwlock/__init__.py
index 0015760..0e01b2a 100644
--- a/aiorwlock/__init__.py
+++ b/aiorwlock/__init__.py
@@ -2,7 +2,7 @@
 import collections
 import sys
 
-__version__ = '0.4.0'
+__version__ = '0.5.0'
 __all__ = ['RWLock']
 
 PY_35 = sys.version_info >= (3, 5, 0)