diff --git a/pubspec.yaml b/pubspec.yaml
index 04fb22bb..baf82ec8 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -20,7 +20,7 @@ dependencies:
   http: '>=0.13.3 <2.0.0'
   logging: ^1.0.1
   path: ^1.8.0
-  protobuf: '>2.0.0 < 4.0.0'
+  protobuf: '^3.1.0'
   stack_trace: ^1.10.0
 
 dev_dependencies: