diff --git a/sipsimple/__info__.py b/sipsimple/__info__.py
index 490ca420..10de707a 100644
--- a/sipsimple/__info__.py
+++ b/sipsimple/__info__.py
@@ -1,14 +1,14 @@
 
 """Package information"""
 
 __project__ = "python-sipsimple"
 __summary__ = "SIP SIMPLE implementation for Python"
 __webpage__ = "https://sipsimpleclient.org"
 
-__version__ = "3.5.1"
+__version__ = "4.0.0"
 
 __author__ = "AG Projects"
 __email__ = "support@ag-projects.com"
 
 __license__ = "GPL"
 __copyright__ = "Copyright 2008-2021 {}".format(__author__)