diff --git a/setup.py b/setup.py
index 9bc6b96c..a0210c1d 100644
--- a/setup.py
+++ b/setup.py
@@ -45,7 +45,7 @@
 ]
 
 grpc_deps = ['grpcio>=1.35,<1.43',
-             'grpcio-tools>=1.35,<1.44',
+             'grpcio-tools>=1.35,<1.51',
              'prometheus_client==0.13.1',
              'click'
              ]