diff --git a/requirements.txt b/requirements.txt
index 1c6112c..0aadcc5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ data==0.4
 decorator==4.2.1
 docopt==0.6.2
 docutils==0.11
-ecdsa==0.13
+ecdsa==0.13.3
 entrypoints==0.2.3
 enum34==1.1.6
 Fabric==1.12.0