diff --git a/fsl/version.py b/fsl/version.py
index 1bcdd41e8eaacc7f02ae479206421d1f102284e2..d15f2d69b6baff5ebd4e06679be3bd27b9deaf96 100644
--- a/fsl/version.py
+++ b/fsl/version.py
@@ -47,7 +47,7 @@ import            re
 import            string
 
 
-__version__ = '3.4.0.dev0'
+__version__ = '3.5.0.dev0'
 """Current version number, as a string. """