diff --git a/setup.py b/setup.py
index 4c2dc15..90745af 100644
--- a/setup.py
+++ b/setup.py
@@ -4,6 +4,7 @@ from inema import __version__
 install_requires = [
         'zeep >= 0.12.0',
         'lxml',
+        'pytz'
 ]
 
 setup(