diff --git a/requirements-test.txt b/requirements-test.txt
index c007a4c..eb1ad13 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -2,7 +2,7 @@ pip
 setuptools
 wheel
 future==0.17.1
-ecdsa==0.13
+ecdsa==0.13.3
 requests==2.21.0
 websocket-client==0.54.0
 pytz==2018.9