diff --git a/setup.py b/setup.py
index 904fb60..bd8c143 100644
--- a/setup.py
+++ b/setup.py
@@ -39,7 +39,7 @@
         url=f"https://github.com/ansys/{package_name}",
         license="MIT",
         python_requires=">=3.10",
-        install_requires=["grpcio~=1.44", "protobuf>=3.19,<6"],
+        install_requires=["grpcio~=1.44", "protobuf>=3.19,<7"],
         packages=setuptools.find_namespace_packages(".", include=("ansys.*",)),
         package_data={
             "": ["*.proto", "*.pyi", "py.typed", "VERSION"],