diff --git a/fsl/version.py b/fsl/version.py
index 9030805603613b6397c11d7fce25d31341d03a42..6c0149185d4d71f19d9616f40ffe39c1a607dd1c 100644
--- a/fsl/version.py
+++ b/fsl/version.py
@@ -47,7 +47,7 @@ import            re
 import            string
 
 
-__version__ = '3.8.0.dev0'
+__version__ = '3.9.0.dev0'
 """Current version number, as a string. """