diff --git a/fsl/version.py b/fsl/version.py
index 844d75565a93b2e7ffdd7c5126c4d8bab9a613ce..1bcdd41e8eaacc7f02ae479206421d1f102284e2 100644
--- a/fsl/version.py
+++ b/fsl/version.py
@@ -47,7 +47,7 @@ import            re
 import            string
 
 
-__version__ = '3.3.0.dev0'
+__version__ = '3.4.0.dev0'
 """Current version number, as a string. """