diff --git a/fsl/version.py b/fsl/version.py
index d40259f541448c9137101a2669c6adfd55cf14f9..53af914072b527c481c37c0361d962b66d64338a 100644
--- a/fsl/version.py
+++ b/fsl/version.py
@@ -47,7 +47,7 @@ import            re
 import            string
 
 
-__version__ = '3.21.0.dev0'
+__version__ = '3.22.0.dev0'
 """Current version number, as a string. """