diff --git a/example/pubspec.lock b/example/pubspec.lock
index 0d90938..f171e6b 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -102,7 +102,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "1.2.5"
+    version: "1.2.6"
   fuchsia_remote_debug_protocol:
     dependency: transitive
     description: flutter
diff --git a/pubspec.yaml b/pubspec.yaml
index 98b77cf..9c40acc 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 1.2.6
 homepage: https://github.com/yosemiteyss/flutter_volume_controller
 
 environment:
-  sdk: ">=2.17.6 <3.0.0"
+  sdk: ">=2.17.6 <4.0.0"
   flutter: ">=2.5.0"
 
 dependencies: