diff --git a/pubspec.yaml b/pubspec.yaml
index b288926..41de4fe 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,6 +5,7 @@ homepage: https://github.com/pinkfish/flutter_native_timezone
 
 environment:
   sdk: '>=2.12.0 <3.0.0'
+  flutter: ">=1.12.0"
 
 dependencies:
   flutter: