diff --git a/fsl/version.py b/fsl/version.py
index 3898a3610b2ebab1f92655416078ea30dc7793f9..c473ae18fbe5c0544d734b19cc5a93dd4f4adb90 100644
--- a/fsl/version.py
+++ b/fsl/version.py
@@ -47,7 +47,7 @@ import            re
 import            string
 
 
-__version__ = '2.4.0'
+__version__ = '2.5.0.dev0'
 """Current version number, as a string. """