diff --git a/fsl/version.py b/fsl/version.py
index 857e009a66d1b952619589832d10c74bdb70c36e..9acc9d7fd9b8247e8cf26252b5e34c05df77064f 100644
--- a/fsl/version.py
+++ b/fsl/version.py
@@ -32,7 +32,7 @@ which roughly obeys the Semantic Versioning conventions (http://semver.org/):
 import string
 
 
-__version__ = '1.0.1'
+__version__ = 'dev'
 """Current version number, as a string. """
 
 
@@ -44,6 +44,9 @@ def parseVersionString(versionString):
     An error is raised if the ``versionString`` is invalid.
     """
 
+    if versionString == 'dev':
+        return 9999, 9999, 9999
+
     components = versionString.split('.')
 
     # Major, minor, and point