diff --git a/example/pubspec.lock b/example/pubspec.lock
index 073b6a2..021a757 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -49,7 +49,7 @@ packages:
       name: cupertino_icons
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.3"
+    version: "1.0.3"
   fake_async:
     dependency: transitive
     description:
@@ -165,3 +165,4 @@ packages:
     version: "2.1.0"
 sdks:
   dart: ">=2.12.0 <3.0.0"
+  flutter: ">=1.12.0"
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index b3a6f9a..d336726 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -22,7 +22,7 @@ dependencies:
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^0.1.3
+  cupertino_icons: ^1.0.3
 
 dev_dependencies:
   flutter_test:
diff --git a/pubspec.lock b/pubspec.lock
index 6c42877..c72185d 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -151,3 +151,4 @@ packages:
     version: "2.1.0"
 sdks:
   dart: ">=2.12.0 <3.0.0"
+  flutter: ">=1.12.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index c6673d8..43ec08f 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -6,6 +6,7 @@ author: vn.apnic@gmail.com
 
 environment:
   sdk: ">=2.12.0 <3.0.0"
+  flutter: ">=1.12.0 <2.0.0"
 
 dependencies:
   flutter: