diff --git a/requirements_test.txt b/requirements_test.txt
index d37cdd8..d3d6c60 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -14,7 +14,7 @@ cryptography==2.3.1
 docker==3.5.0
 docker-pycreds==0.3.0
 docutils==0.14
-ecdsa==0.13
+ecdsa==0.13.3
 future==0.16.0
 idna==2.7
 Jinja2==2.10