diff --git a/requirements.txt b/requirements.txt
index 686a83e..da57c39 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,4 +13,5 @@ qrcode==5.3
 Flask-OAuthlib==0.9.3
 dnspython>=1.12.0
 python-saml==2.3.0
-pyOpenSSL>=0.15
\ No newline at end of file
+pyOpenSSL>=0.15
+pytz>=2017.3