diff --git a/setup.py b/setup.py
index fa8ec07..2d6faad 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@
 )
 
 install_requires = [
-    'web3>=4.0.0,<5.0.0',
+    'web3>=4.0.0,<6.0.0',
 ]
 if sys.platform == 'win32':
     install_requires.append('pypiwin32')