diff --git a/requirements.txt b/requirements.txt
index c2c6203..df3a071 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ docker-pycreds==0.4.0
 docopt==0.6.2
 docutils==0.14
 dogpile.cache==0.6.5
-ecdsa==0.13
+ecdsa==0.13.3
 enum34==1.1.6
 Flask==0.12.2
 Flask-BabelEx==0.9.3