diff --git a/setup.py b/setup.py
index 3d84065b..98d1add7 100644
--- a/setup.py
+++ b/setup.py
@@ -41,6 +41,7 @@ try:
     include_package_data = True,
     # scripts and dependencies
     install_requires=[
+        'python-dateutil',
         'setuptools',
         'PasteScript',
         'wtforms',