diff --git a/pubspec.yaml b/pubspec.yaml
index ea6ec720..fc146e9d 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 1.1.1
 author: Tobe O <thosakwe@gmail.com>
 homepage: https://github.com/angel-dart/proxy
 environment:
-  sdk: ">=1.19.0"
+  sdk: ">=1.19.0 <3.0.0"
 dependencies:
   angel_framework: ^1.1.0-alpha
   http: ^0.11.3