diff --git a/pubspec.yaml b/pubspec.yaml
index f97be67..48901b8 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,7 +5,7 @@ homepage: "https://github.com/MeowType/GraphDart"
 repository: "https://github.com/MeowType/GraphDart"
 issue_tracker: "https://github.com/MeowType/GraphDart/issues"
 environment:
-  sdk: ">=2.14.0 <3.0.0"
+  sdk: "<4.0.0"
 dependencies:
   some: ^2.0.0
 dev_dependencies: