diff --git a/intervals.py b/intervals.py
index cc5df9b..e862cb7 100644
--- a/intervals.py
+++ b/intervals.py
@@ -9,7 +9,7 @@
 
 
 __package__ = 'python-intervals'
-__version__ = '1.10.0'
+__version__ = '1.10.0-pre1'
 __licence__ = 'LGPL3'
 __author__ = 'Alexandre Decan'
 __url__ = 'https://github.com/AlexandreDecan/python-intervals'