diff --git a/setup.py b/setup.py
index ee5f40e..5f576e1 100644
--- a/setup.py
+++ b/setup.py
@@ -47,6 +47,6 @@ def get_entry_points():
         **get_entry_points()
     },
     install_requires=[
-        'ssh-mitm>=0.4.1'
+        'ssh-mitm>=0.4.1,<1.0.0'
     ]
 )