diff --git a/pydu/__init__.py b/pydu/__init__.py
index 35339e1..40909ca 100644
--- a/pydu/__init__.py
+++ b/pydu/__init__.py
@@ -2,7 +2,7 @@
 Useful data structures, utils for Python.
 """
 
-__version__ = '0.4.1'
+__version__ = '0.4.2'
 
 
 # Set logging handler to avoid "No handler found" warnings.