diff --git a/pubspec.yaml b/pubspec.yaml
index 71132dbf..bea4efc2 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -12,7 +12,7 @@ dependencies:
   http: '>=0.13.0 <2.0.0'
   logging: ^1.0.0
   meta: '>=1.9.1 <2.0.0'
-  protobuf: '>=2.0.0 <4.0.0'
+  protobuf: ">=2.0.0 <5.0.0"
   quiver: '>=3.0.0 <4.0.0'
 
 dev_dependencies: