diff --git a/setup.py b/setup.py
index 9ae8117f..de7ef106 100644
--- a/setup.py
+++ b/setup.py
@@ -79,7 +79,7 @@ except ImportError:
 # Take a look at http://www.python.org/dev/peps/pep-0386/
 # for a consistent versioning pattern.
 
-PSYCOPG_VERSION = '2.4.1'
+PSYCOPG_VERSION = '2.4.2.dev0'
 
 version_flags   = ['dt', 'dec']