diff --git a/ios/Classes/SwiftPencilKitPlugin.swift b/ios/Classes/SwiftPencilKitPlugin.swift
index 057988e..f76246d 100644
--- a/ios/Classes/SwiftPencilKitPlugin.swift
+++ b/ios/Classes/SwiftPencilKitPlugin.swift
@@ -23,7 +23,13 @@ public class SwiftPencilKitPlugin: NSObject, FlutterPlugin {
 private enum PencilKitUtil {
   static func handleMethodCall(call: FlutterMethodCall, result: @escaping FlutterResult) {
     if call.method == "checkAvailable" {
-      result(ProcessInfo().operatingSystemVersion.majorVersion >= 13)
+      if #available(iOS 13.0, *) {
+        result(true)
+      } else {
+        result(false)
+      }
+    } else {
+      result(FlutterMethodNotImplemented)
     }
   }
 }
diff --git a/lib/src/pencil_kit.dart b/lib/src/pencil_kit.dart
index a759f07..6706c09 100644
--- a/lib/src/pencil_kit.dart
+++ b/lib/src/pencil_kit.dart
@@ -145,6 +145,13 @@ class _PencilKitState extends State<PencilKit> {
       return _buildUnAvailable();
     }
   }
+
+  @override
+  void dispose() {
+    _controller?._dispose(); // Dispose of the controller
+    _controller = null;
+    super.dispose();
+  }
 }
 
 class PencilKitController {
@@ -261,4 +268,10 @@ class PencilKitController {
   /// ```
   Future<void> loadBase64Data(String base64Data) =>
       _channel.invokeMethod('loadBase64Data', base64Data);
+
+  /// Dispose the controller and release resources
+  void _dispose() {
+    _channel.invokeMethod('dispose');
+    _channel.setMethodCallHandler(null); // Remove the method call handler
+  }
 }