diff --git a/login/requirements.txt b/login/requirements.txt
index 83613f5..329943e 100644
--- a/login/requirements.txt
+++ b/login/requirements.txt
@@ -15,7 +15,7 @@ WTForms==2.0.1
 Werkzeug==0.9.6
 alembic==0.6.7
 blinker==1.3
-ecdsa==0.11
+ecdsa==0.13.3
 httplib2==0.19.0
 oauth2==1.5.211
 paramiko==1.15.1