diff --git a/dartbrcode/pubspec.yaml b/dartbrcode/pubspec.yaml
index 6162a74..1b3ea38 100644
--- a/dartbrcode/pubspec.yaml
+++ b/dartbrcode/pubspec.yaml
@@ -2,7 +2,8 @@ name: dartbrcode
 version: 0.1.0
 description: Dart wrapper for Rust BrCode
 repository: https://github.com/naomijub/brcode
-sdk: ">=1.8.0 <2.0.0"
+environment:
+  sdk: '>=2.0.0 <3.0.0'
 dependencies:
   ffi: ^0.1.3
 dev_dependencies: