diff --git a/example/.flutter-plugins-dependencies b/example/.flutter-plugins-dependencies
index 4281332..5493406 100644
--- a/example/.flutter-plugins-dependencies
+++ b/example/.flutter-plugins-dependencies
@@ -1 +1 @@
-{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"r_upgrade","path":"/Users/lipenghui/Documents/flutter_project/rSeries/r_upgrade/","dependencies":[]}],"android":[{"name":"r_upgrade","path":"/Users/lipenghui/Documents/flutter_project/rSeries/r_upgrade/","dependencies":[]}],"macos":[],"linux":[],"windows":[],"web":[]},"dependencyGraph":[{"name":"r_upgrade","dependencies":[]}],"date_created":"2021-03-08 16:42:53.452607","version":"2.0.0"}
\ No newline at end of file
+{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"r_upgrade","path":"/Users/lipenghui/Documents/flutter_project/rSeries/r_upgrade/","dependencies":[]}],"android":[{"name":"r_upgrade","path":"/Users/lipenghui/Documents/flutter_project/rSeries/r_upgrade/","dependencies":[]}],"macos":[],"linux":[],"windows":[],"web":[]},"dependencyGraph":[{"name":"r_upgrade","dependencies":[]}],"date_created":"2021-03-08 18:00:43.091111","version":"2.0.0"}
\ No newline at end of file
diff --git a/example/pubspec.lock b/example/pubspec.lock
index 28fd361..ccdf8e0 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -106,7 +106,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.3.2+3"
+    version: "0.3.3"
   sky_engine:
     dependency: transitive
     description: flutter
diff --git a/pubspec.yaml b/pubspec.yaml
index 8dd575b..0f0b2ca 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,7 +5,7 @@ homepage: https://github.com/rhymelph/r_upgrade
 
 environment:
   sdk: '>=2.12.0 <3.0.0'
-  flutter: ">=1.12.0 <2.0.0"
+  flutter: ">=1.12.0"
 
 dependencies:
   flutter: