diff --git a/pubspec.yaml b/pubspec.yaml
index a675141..6418865 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -6,7 +6,7 @@ repository: https://github.com/Stacked-Org/themes.git
 issue_tracker: https://github.com/Stacked-Org/framework/issues
 
 environment:
-  sdk: ">=2.19.0 <3.0.0"
+  sdk: "<4.0.0"
 
 dependencies:
   flutter: