diff --git a/requirements.txt b/requirements.txt
index 0eedaa1..2077ce4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ certifi==2017.7.27.1
 chardet==3.0.4
 docopt==0.6.2
 docutils==0.12
-ecdsa==0.13
+ecdsa==0.13.3
 Fabric3==1.12.post1
 idna==2.6
 imagesize==0.7.1