diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index a4ed45eea4b2094dfc68292cb19b98229305f132..354f01325aa19a9fd6598274ecb6bb0cba112f4a 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -6,7 +6,7 @@ description: Demonstrates how to use the recognition_qrcode plugin.
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 
 environment:
-  sdk: ">=2.12.0 <=3.0.6"
+  sdk: ">=2.12.0 <=4.0.6"
 
 dependencies:
   flutter:
diff --git a/pubspec.yaml b/pubspec.yaml
index af2075a92edd533188ba8afa59e814b0bb21d489..e56eed08c8068217ad9465b26d2441d0e5c41cca 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 2.0.0
 homepage: https://github.com/liranhao/recognition_qrcode
 
 environment:
-  sdk: ">=2.12.0 <=3.0.6"
+  sdk: ">=2.12.0 <=4.0.6"
   flutter: ">=2.0.0"
 
 dependencies: