diff --git a/setup.py b/setup.py
index 234ebc5..ab570a9 100755
--- a/setup.py
+++ b/setup.py
@@ -22,6 +22,7 @@ setup(name='talon',
           "scikit-learn==0.16.1", # pickled versions of classifier, else rebuild
           'chardet>=1.0.1',
           'cchardet>=0.3.5',
+          'cssselect'
           ],
       tests_require=[
           "mock",