diff --git a/setup.py b/setup.py
index 1fe3d77..a48f676 100644
--- a/setup.py
+++ b/setup.py
@@ -11,6 +11,7 @@
       packages=find_packages(),
       install_requires=[
           'python-dateutil',
+          'tzlocal',
           'requests',
           'requests[security]'
       ],