diff --git a/requirements.txt b/requirements.txt
index cf829d8..ea4722a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ icalendar
 Jinja2>=2.8  # BSD License (3 clause)
 PyYAML>=3.1.0  # MIT
 extras>=1.0.0  # MIT
+pytz