diff --git a/pubspec.yaml b/pubspec.yaml
index 55e0a06..6ddd31f 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,7 +5,7 @@ homepage: https://www.wafrat.com
 repository: https://github.com/atn832/firebase_storage_mocks
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.12.0 <4.0.0"
 
 dependencies:
   flutter: