diff --git a/src/py/crankshaft/setup.py b/src/py/crankshaft/setup.py
index c0f8c50..96c804f 100644
--- a/src/py/crankshaft/setup.py
+++ b/src/py/crankshaft/setup.py
@@ -40,7 +40,11 @@ setup(
 
     # The choice of component versions is dictated by what's
     # provisioned in the production servers.
-    install_requires=['pysal==1.11.0','numpy==1.6.1','scipy==0.17.0'],
+    install_requires=[
+        'numpy',
+        'scipy',
+        'pysal',
+    ]
 
     requires=['pysal', 'numpy'],