diff --git a/requirements.txt b/requirements.txt
index 9c06018..f563d24 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ certifi==2018.11.29
 chardet==3.0.4
 Click==7.0
 construct==2.9.45
-ecdsa==0.13
+ecdsa==0.13.3
 falcon==1.4.1
 future==0.17.1
 gunicorn==19.9.0