diff --git a/pubspec.yaml b/pubspec.yaml
index f22a0c1..524e874 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -6,9 +6,9 @@ description: |
 version: 1.2.1
 repository: https://github.com/pitabwire/xid
 environment:
-  sdk: ^2.18.0
+  sdk: '>=3.0.0 <4.0.0'
 
 dev_dependencies:
-  flutter_lints: ^2.0.2
+  flutter_lints: ^6.0.0
   test: ^1.16.0