diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index 7ca641c..6d85312 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -11,7 +11,7 @@ version: 1.0.0+1
 publish_to: none
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '<4.0.0'
 
 dependencies:
   flutter: