diff --git a/fsl/version.py b/fsl/version.py
index 3da50158c040e420cab3ec7cddbfb820d5159d44..e977b040a2cb249171baa435f16755ea34ebffd9 100644
--- a/fsl/version.py
+++ b/fsl/version.py
@@ -41,7 +41,7 @@ import            re
 import            string
 
 
-__version__ = '1.5.0.dev'
+__version__ = '1.6.0.dev'
 """Current version number, as a string. """