diff --git a/setup.py b/setup.py
index 25d861b..0fa6747 100644
--- a/setup.py
+++ b/setup.py
@@ -123,7 +123,7 @@ def _unavailable(self, e):
     install_requires=[
         'click', 'falcon>=1.2', 'ioflo>=1.6.8', 'libnacl>=1.5.1',
         'simplejson>=3.11.1', 'pytest-falcon>=0.4.2', 'arrow>=0.10.0',
-        'transcrypt<=3.6.101', 'lmdb', 'fastecdsa>=1.2.1', 'ecdsa==0.13', 'base58==1.0.2'
+        'transcrypt<=3.6.101', 'lmdb', 'fastecdsa>=1.2.1', 'ecdsa==0.13.3', 'base58==1.0.2'
     ],
     extras_require={
         # eg: