diff --git a/pubspec.yaml b/pubspec.yaml
index f58c2c9..0d9646d 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -11,7 +11,7 @@ dependencies:
   grpc: ^4.0.1
   http: ^1.2.1
   meta: ^1.11.0
-  protobuf: ^3.1.0
+  protobuf: ^4.0.0
   synchronized: ^3.3.0
   uuid: ^4.3.2