diff --git a/pubspec.yaml b/pubspec.yaml
index 4a36d61..649e34e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ description: >
   RFC4122 (v1, v4, v5, v6, v7, v8) UUID Generator and Parser for Dart
 homepage: https://github.com/Daegalus/dart-uuid
 environment:
-  sdk: ">=2.14.0 <3.0.0"
+  sdk: ">=2.14.0 <4.0.0"
 dependencies:
   crypto: ^3.0.0
   sprintf: ^7.0.0