diff --git a/setup.py b/setup.py
index e03876a8..a66b2195 100644
--- a/setup.py
+++ b/setup.py
@@ -73,7 +73,7 @@ except ImportError:
 # Take a look at http://www.python.org/dev/peps/pep-0386/
 # for a consistent versioning pattern.
 
-PSYCOPG_VERSION = '2.4.2'
+PSYCOPG_VERSION = '2.4.3.dev0'
 
 version_flags   = ['dt', 'dec']