diff --git a/fsl/version.py b/fsl/version.py
index 520dc6191809b5bf4f618a4cb41b79d43f1f958a..f8e6092135fbacea0d5a152c82de9ab93650fde5 100644
--- a/fsl/version.py
+++ b/fsl/version.py
@@ -47,7 +47,7 @@ import            re
 import            string
 
 
-__version__ = '2.3.0.dev0'
+__version__ = '2.4.0.dev0'
 """Current version number, as a string. """