diff --git a/src/py/crankshaft/setup.py b/src/py/crankshaft/setup.py
index 8d5e622..baa88e3 100644
--- a/src/py/crankshaft/setup.py
+++ b/src/py/crankshaft/setup.py
@@ -40,9 +40,9 @@ setup(
 
     # The choice of component versions is dictated by what's
     # provisioned in the production servers.
-    install_requires=['pysal==1.9.1'],
+    install_requires=['pysal==1.9.1', 'sklearn==0.17.1'],
 
-    requires=['pysal', 'numpy' ],
+    requires=['pysal', 'numpy', 'sklearn' ],
 
     test_suite='test'
 )