diff --git a/requirements.txt b/requirements.txt
index 51f106e..eff581e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ Django==1.11.10
 django-fcm==0.1.1
 django-uuidfield==0.5.0
 djangorestframework==3.8.2
-ecdsa==0.13
+ecdsa==0.13.3
 enum34==1.1.6
 fcm-django==0.2.18
 future==0.16.0