diff --git a/setup.py b/setup.py
index b3eeec82..8ec7329c 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@
 def getRequires():
     deps = [
         'python_http_client>=3.2.1',
-        'starkbank-ecdsa>=1.0.0'
+        'starkbank-ecdsa>=1.0.0,<2.0.0'
     ]
     return deps