diff --git a/requirements.txt b/requirements.txt
index 874fe9d8a..99bd77178 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ python-novaclient>=2.18.0
 python-neutronclient>=2.3.6,<3
 python-swiftclient>=2.2.0
 python-ceilometerclient>=1.0.6
-pytz>=2010h
+pytz
 # Horizon Utility Requirements
 # for SECURE_KEY generation
 lockfile>=0.8