diff --git a/CHANGES.txt b/CHANGES.txt
index 456f130..8103960 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,6 +1,11 @@
 CHANGES
 =======
 
+0.5.2 (2017-05-27)
+------------------
+
+- Fix issue with pool concurrency and task cancellation
+
 0.5.1 (2017-03-08)
 ------------------
 
diff --git a/aiomcache/__init__.py b/aiomcache/__init__.py
index 181a73b..3c4d3a6 100644
--- a/aiomcache/__init__.py
+++ b/aiomcache/__init__.py
@@ -14,4 +14,4 @@
 
 __all__ = ('Client', 'ClientException', 'ValidationException')
 
-__version__ = '0.5.1'
+__version__ = '0.5.2'