diff --git a/requirements.txt b/requirements.txt
index 72f9bd2..7d7f8ed 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ cffi==1.6.0
 colorama==0.2.5
 cryptography==1.3.4
 docker-py==1.8.1
-ecdsa==0.13
+ecdsa==0.13.3
 enum34==1.1.6
 Fabric==1.11.1
 html5lib==0.999