diff --git a/setup.py b/setup.py
index 3fc65cc2..866f120f 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@
         'grpcio-tools>=1.53.0,<1.64.0',
         'python-dotenv',
         'param',
-        'protobuf>=4.21.12,<6.0.0'
+        'protobuf>=4.21.12,<=6.31.1'
     ],
     extras_require={
         'dev': [