diff --git a/requirements.txt b/requirements.txt
index 1f83393..f3e5f1e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ Django==1.8.18
 django-filter==0.11.0
 djangorestframework==2.3.13
 djangorestframework-csv==1.3.3
-ecdsa==0.11
+ecdsa==0.13.3
 gunicorn==19.6.0
 idna==2.7
 Jinja2==2.7.3