diff --git a/pubspec.yaml b/pubspec.yaml
index 60c35c8..44ff7f4 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 1.6.0
 homepage: https://github.com/rufman/license_checker
 
 environment:
-  sdk: ">=2.15.1 <3.0.0"
+  sdk: ">=2.15.1 <4.0.0"
 
 dependencies:
   args: ^2.3.0