diff --git a/pubspec.yaml b/pubspec.yaml
index d1051aa..6089fff 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,4 +5,4 @@ description: mqtt dart client library
 homepage: https://github.com/jnguillerme/mqtt.dart
 dependencies:
   ini: any
-  unittest: any
+  unittest: '>= 0.11'