diff --git a/setup.py b/setup.py
index f5b1805..587ccb1 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@
       author_email='david.marx84@gmail.com',
       url='http://github.com/dmarx/psaw',
       license='Simplified BSD License',
-      install_requires=['requests', 'Click'],
+      install_requires=['requests', 'Click', 'python-dateutil'],
       entry_points="""
           [console_scripts]
           psaw=psaw.psaw:cli