diff --git a/requirements.txt b/requirements.txt
index 18f4aa8..97cebd8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ cryptography>=2.3
 curtsies==0.3.0
 cycler==0.10.0
 docopt==0.6.2
-ecdsa==0.13
+ecdsa==0.13.3
 Events==0.3
 Flask==1.0.2
 Flask-Cors==3.0.6