diff --git a/certbot-ci/setup.py b/certbot-ci/setup.py
index ec632a471..0ea188e57 100644
--- a/certbot-ci/setup.py
+++ b/certbot-ci/setup.py
@@ -26,6 +26,7 @@ install_requires = [
     # installation on Linux.
     'pywin32>=300 ; sys_platform == "win32"',
     'pyyaml',
+    'pytz>=2019.3',
     'requests',
     'setuptools',
     'types-python-dateutil'