diff --git a/python/setup.py b/python/setup.py
index bc3d5c9c..11f677a4 100644
--- a/python/setup.py
+++ b/python/setup.py
@@ -39,7 +39,7 @@ def has_ext_modules(self):
     license='Apache License, Version 2.0',
     python_requires='>=3.5,<4',
     install_requires=[
-        'protobuf>=3.8.0,<4',
+        'protobuf>=3.8.0,<7',
     ],
     extras_require={
         'tensorflow': ['tensorflow>=1.15,<3'],