diff --git a/pyproject.toml b/pyproject.toml
index d6eae5238b83..674659cf8197 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,7 +68,7 @@ flower-client-app = "flwr.client.supernode:run_client_app" # Deprecated
 python = "^3.9"
 # Mandatory dependencies
 numpy = ">=1.26.0,<3.0.0"
-grpcio = "^1.60.0,!=1.64.2,<=1.64.3"
+grpcio = "^1.69.0"
 protobuf = "^4.25.2"
 cryptography = "^42.0.4"
 pycryptodome = "^3.18.0"
diff --git a/src/py/flwr/client/grpc_client/connection.py b/src/py/flwr/client/grpc_client/connection.py
index 2c855a65ce12..ccedc0a996f1 100644
--- a/src/py/flwr/client/grpc_client/connection.py
+++ b/src/py/flwr/client/grpc_client/connection.py
@@ -47,12 +47,6 @@
 )
 from flwr.proto.transport_pb2_grpc import FlowerServiceStub  # pylint: disable=E0611
 
-# The following flags can be uncommented for debugging. Other possible values:
-# https://github.com/grpc/grpc/blob/master/doc/environment_variables.md
-# import os
-# os.environ["GRPC_VERBOSITY"] = "debug"
-# os.environ["GRPC_TRACE"] = "tcp,http"
-
 
 def on_channel_state_change(channel_connectivity: str) -> None:
     """Log channel connectivity."""
diff --git a/src/py/flwr/common/grpc.py b/src/py/flwr/common/grpc.py
index 5fc96d8666b4..8c2801b818b1 100644
--- a/src/py/flwr/common/grpc.py
+++ b/src/py/flwr/common/grpc.py
@@ -16,6 +16,7 @@
 
 
 import concurrent.futures
+import os
 import sys
 from collections.abc import Sequence
 from logging import DEBUG, ERROR
@@ -35,6 +36,12 @@
 
 AddServicerToServerFn = Callable[..., Any]
 
+if "GRPC_VERBOSITY" not in os.environ:
+    os.environ["GRPC_VERBOSITY"] = "error"
+# The following flags can be uncommented for debugging. Other possible values:
+# https://github.com/grpc/grpc/blob/master/doc/environment_variables.md
+# os.environ["GRPC_TRACE"] = "tcp,http"
+
 
 def create_channel(
     server_address: str,