diff --git a/setup.py b/setup.py
index e4c6157..c75a3d6 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
     packages=find_packages(),
     install_requires=[
         "grpcio>=1.64.1",
-        "protobuf<6.0.0,>=5.26.1",
+        "protobuf>=5.26.1,<7.0.0",
         "google>=3.0",
         "requests>=2.32.3",
         "PyJWT>=2.8,<2.10",