diff --git a/setup.py b/setup.py
index f86d340..8778540 100644
--- a/setup.py
+++ b/setup.py
@@ -1,9 +1,19 @@
 #!/usr/bin/env python
 
+def getversion(fname):
+	with open(fname) as fp:
+		v = [ x for x in fp.readlines() if x.startswith('__version__') ]
+		if len(v) != 1:
+			raise ValueError('too many lines start with __version__')
+		return v[0].split("'")[1]
+
 from setuptools import setup
+import os.path
+
+__version__ = getversion(os.path.join('casimport', '__init__.py'))
 
 setup(name='casimport',
-    version='0.1.0',
+    version=__version__,
     description='Import python modules via content address.',
     author='John-Mark Gurney',
     author_email='jmg@funkthat.com',