diff --git a/proteus/__init__.py b/proteus/__init__.py
index aff60a8ff2..906dc47d97 100644
--- a/proteus/__init__.py
+++ b/proteus/__init__.py
@@ -3,7 +3,7 @@
 '''
 A library to access Tryton's models like a client.
 '''
-__version__ = "1.8.0"
+__version__ = "1.9.0"
 __all__ = ['Model', 'Wizard']
 from types import NoneType
 import threading