diff --git a/synop2bufr/__init__.py b/synop2bufr/__init__.py
index 0c2cddd..afeeea9 100644
--- a/synop2bufr/__init__.py
+++ b/synop2bufr/__init__.py
@@ -33,7 +33,7 @@
 from csv2bufr import BUFRMessage
 from pymetdecoder import synop
 
-__version__ = '0.3.2'
+__version__ = '0.4.dev0'
 
 LOGGER = logging.getLogger(__name__)