diff --git a/requirements.txt b/requirements.txt
index 16fb224..965bb08 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ click==6.7
 configparser==3.5.0
 cryptography==1.7.2
 decorator==4.1.2
-ecdsa==0.13
+ecdsa==0.13.3
 enum34==1.1.6
 eventlet
 Flask==0.12.2