diff --git a/pubspec.yaml b/pubspec.yaml
index 3903f40..a6eab66 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -8,6 +8,9 @@ dependencies:
   flutter:
     sdk: flutter
 
+environment:
+  sdk: ">=2.0.0-dev.58.0 <3.0.0"
+
 # For information on the generic Dart part of this file, see the
 # following page: https://www.dartlang.org/tools/pub/pubspec