diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7ed98a1..e8de460 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -13,7 +13,7 @@ on:
     types: [opened, reopened, synchronize]
 
 env:
-  FLUTTER_VERSION: '3.41.7'
+  FLUTTER_VERSION: 3.x
 
 jobs:
 
diff --git a/.github/workflows/installers.yaml b/.github/workflows/installers.yaml
index 0a68668..7103178 100644
--- a/.github/workflows/installers.yaml
+++ b/.github/workflows/installers.yaml
@@ -48,7 +48,7 @@ env:
   MACOS_APP_RELEASE_UNSIGNED_PATH: build/macos/Build/Products/Release-unsigned
   MACOS_APP_RELEASE_STAGING_PATH: build/macos/Build/Products/Release-staging
   MACOS_APP_RELEASE_DEV_PATH: build/macos/Build/Products/Release-dev
-  FLUTTER_VERSION: "3.41.7"
+  FLUTTER_VERSION: 3.x
 
 jobs:
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae84316..64b3aef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ utilised by the flutter version_widget package.
 
 ## 0.1 Stable beta release
 
++ Use file_picker v12.x API [0.0.13]
 + Remove null/empty values from output JSON [0.0.12 20260511 tonypioneer]
 + Update file_picker dependency [0.0.11 20260424 anushkavid]
 + Migrate to universal_web to allow native web build [0.0.10 20260217 dc]
diff --git a/analysis_options.yaml b/analysis_options.yaml
index 42239ef..3f6e284 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -28,3 +28,4 @@ analyzer:
   exclude:
     - ignore/**
     - ignore/
+    - build/**
diff --git a/lib/src/widgets/button_file_saver.dart b/lib/src/widgets/button_file_saver.dart
index af926d4..44e9a6c 100644
--- a/lib/src/widgets/button_file_saver.dart
+++ b/lib/src/widgets/button_file_saver.dart
@@ -24,12 +24,11 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 ///
-/// Authors: Tony Chen
+/// Authors: Tony Chen, Dawei Chen
 
 library;
 
 import 'dart:convert';
-import 'dart:io' show File;
 
 import 'package:flutter/foundation.dart' show kIsWeb;
 import 'package:flutter/material.dart';
@@ -129,35 +128,35 @@ Future<void> saveDataForNonWeb(
 ) async {
   final messenger = ScaffoldMessenger.of(context);
 
-  String? selectedFile = await FilePicker.saveFile(
-    dialogTitle: 'Please choose a filename and path to save the result',
-    fileName: defaultFileName,
-    type: FileType.custom,
-    allowedExtensions: ['json'],
-  );
-
-  if (selectedFile != null) {
-    final file = File(selectedFile);
+  try {
     final jsonContent = jsonEncoder.convert(data);
 
-    try {
-      await file.writeAsString(jsonContent);
-      debugPrint('File saved at $selectedFile');
+    final selectedFileUri = await FilePicker.saveFile(
+      dialogTitle: 'Please choose a filename and path to save the result',
+      fileName: defaultFileName,
+      bytes: utf8.encode(jsonContent),
+      mimeType: 'application/json',
+      type: FileType.custom,
+      allowedExtensions: ['json'],
+    );
+
+    if (selectedFileUri != null) {
+      debugPrint('File saved at $selectedFileUri');
 
       messenger.showSnackBar(
-        SnackBar(content: Text('Data saved as $selectedFile')),
+        SnackBar(content: Text('Data saved as $selectedFileUri')),
       );
-    } catch (e) {
-      debugPrint('Error saving file: $e');
-
+    } else {
+      debugPrint('Save file dialog was cancelled.');
       messenger.showSnackBar(
-        SnackBar(content: Text('Error saving file: $e')),
+        const SnackBar(content: Text('Save cancelled.')),
       );
     }
-  } else {
-    debugPrint('Save file dialog was cancelled.');
+  } catch (e) {
+    debugPrint('Error saving file: $e');
+
     messenger.showSnackBar(
-      const SnackBar(content: Text('Save cancelled.')),
+      SnackBar(content: Text('Error saving file: $e')),
     );
   }
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index b0ff0ae..3c8b602 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: markdown_widget_builder
 description: "Widget builder for surveys defined using markdown-like syntax."
-version: 0.0.12
+version: 0.0.13
 homepage: https://github.com/anusii/markdown_widget_builder
 
 environment:
@@ -18,15 +18,15 @@ dependencies:
   flutter:
     sdk: flutter
 
-  audioplayers: ^6.5.1
-  file_picker: ^11.0.2
-  flutter_markdown_plus: ^1.0.7
+  audioplayers: ^6.8.1
+  file_picker: ^12.1.3
+  flutter_markdown_plus: ^1.0.12
   http: ^1.6.0
   media_kit: ^1.2.6
   media_kit_libs_video: ^1.0.7
   media_kit_video: ^2.0.1
   path: ^1.9.1
-  path_provider: ^2.1.5
+  path_provider: ^2.1.6
   # universal_html: ^2.3.0
   universal_web: ^1.1.1+1
   url_launcher: ^6.3.2
@@ -34,7 +34,7 @@ dependencies:
 dev_dependencies:
   custom_lint: ^0.8.1
   flutter_lints: ^6.0.0
-  import_order_lint: ^0.2.2
+  import_order_lint: ^0.2.3
 
 flutter:
   uses-material-design: true