diff --git a/pubspec.yaml b/pubspec.yaml
index bc06e84..baa8b1e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -21,5 +21,5 @@ dev_dependencies:
   alchemist: ^0.6.1
   flutter_test:
     sdk: flutter
-  mocktail: ^0.3.0
+  mocktail: ">=0.3.0 <2.0.0"
   very_good_analysis: ^5.0.0