diff --git a/requirements.txt b/requirements.txt
index 7b7648ac..1b10912e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 parsedatetime >= 1.1.2
+pytz >= 2013b
 colorama >= 0.2.5
 pycrypto >= 2.6