diff --git a/pubspec.yaml b/pubspec.yaml
index 3963f1b..6909d53 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 1.0.0+1
 publish_to: none
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '<4.0.0'
 
 dependencies:
   flutter: