diff --git a/setup.py b/setup.py
index 5b14702..43dcf58 100644
--- a/setup.py
+++ b/setup.py
@@ -35,7 +35,7 @@
         url=f"https://github.com/ansys/{package_name}",
         license="MIT",
         python_requires=">=3.7",
-        install_requires=["grpcio~=1.17", "protobuf~=3.19"],
+        install_requires=["grpcio~=1.17", "protobuf>=3.19,<5"],
         package_dir = {"": "src"},
         packages=setuptools.find_namespace_packages("src", include=("ansys.*",)),
         package_data={