diff --git a/setup.py b/setup.py
index a5c06779..005e6ce0 100644
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,7 @@
         'colorama==0.3.9',
         'coloredlogs==9.0',
         'web3==4.0.0b11',
-        'ecdsa==0.13',
+        'ecdsa==0.13.3',
         'requests==2.20.0',
 
         # fixed requirements of ethereum