diff --git a/tests/requirements/base.txt b/tests/requirements/base.txt
index f9cb570c62..f011bd6de7 100644
--- a/tests/requirements/base.txt
+++ b/tests/requirements/base.txt
@@ -8,6 +8,7 @@ Pillow
 PyYAML
 # pylibmc/libmemcached can't be built on Windows.
 pylibmc; sys.platform != 'win32'
+pytz
 selenium
 sqlparse
 tblib