diff --git a/pubspec.yaml b/pubspec.yaml
index af5085e..a08a68c 100755
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 0.1.0
 homepage: https://github.com/zesage/flutter_cube
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.18.0 <3.0.0'
 
 dependencies:
   flutter: