diff --git a/requirements-dev.txt b/requirements-dev.txt
index 9a7399c..936882d 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -7,7 +7,7 @@ nose==1.3.6
 py==1.4.26
 pytest==2.7.0
 pytest-cov==1.8.1
-ecdsa==0.13
+ecdsa==0.13.3
 wsgiref==0.1.2
 
 -r requirements.txt