diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dde3240..fc8cc2c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,5 @@
 variables:
-  FLUTTER_VERSION: 3.24.3
+  FLUTTER_VERSION: 3.29.2
 
 image: registry.gitlab.com/theonewiththebraid/flutter-dockerimages:${FLUTTER_VERSION}-base
 
diff --git a/lib/pkpass/models/barcode.dart b/lib/pkpass/models/barcode.dart
index 83bc06a..63a8a17 100644
--- a/lib/pkpass/models/barcode.dart
+++ b/lib/pkpass/models/barcode.dart
@@ -81,7 +81,7 @@ class PassBarcode {
     return PassBarcode(
       format: _allowedFormats[json['format']]!,
       barcodeData:
-          Uint8List.fromList(messageEncoding.encode(json['message'] as String)),
+          Uint8List.fromList(messageEncoding.encode((json['message'] as String).replaceAll('\\', '\\\\'))),
       messageEncoding: messageEncoding,
       altText: json['altText'] as String?,
     );
diff --git a/lib/pkpass/pass_file.dart b/lib/pkpass/pass_file.dart
index c0a4578..3c93fd1 100644
--- a/lib/pkpass/pass_file.dart
+++ b/lib/pkpass/pass_file.dart
@@ -5,7 +5,6 @@ import 'package:archive/archive.dart';
 import 'package:charset/charset.dart';
 import 'package:crypto/crypto.dart';
 import 'package:intl/locale.dart';
-
 import 'package:pkpass/pkpass.dart';
 import 'package:pkpass/pkpass/utils/file_matcher.dart';
 import 'package:pkpass/pkpass/utils/lproj_parser.dart';
@@ -36,7 +35,10 @@ class PassFile {
           final file = archive.files
               .singleWhere((element) => element.name == manifestEntry.key);
 
-          final content = file.byteContent;
+          final content = file.readBytes();
+          if (content == null) {
+            return;
+          }
 
           String hash = sha1.convert(content).toString();
 
@@ -80,7 +82,7 @@ class PassFile {
     );
     if (path == null) return null;
     final file = _folder.singleWhere((element) => element.name == path);
-    final content = file.byteContent;
+    final content = file.readBytes();
     return content;
   }
 
@@ -119,29 +121,25 @@ class PassFile {
 extension on ArchiveFile {
   String get stringContent {
     final codec = Charset.detect(
-          byteContent,
+          readBytes()!,
           defaultEncoding: utf8,
           orders: [
             utf8,
             ascii,
             gbk,
             latin1,
+            utf16,
           ],
         ) ??
         utf8;
-    return codec.decode(content);
-  }
-
-  Uint8List get byteContent {
-    decompress();
-
-    final content = this.content;
-    if (content is String) {
-      return utf8.encode(content);
-    } else if (content is Iterable) {
-      return Uint8List.fromList(content.cast<int>().toList());
-    } else {
-      return rawContent!.toUint8List();
+    try {
+      return codec.decode(content);
+    } on FormatException {
+      // utf8 and utf16 are hard to distinguish
+      if (codec is Utf8Codec) {
+        return utf16.decode(content);
+      }
+      rethrow;
     }
   }
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index c442e86..1b08fd3 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: pkpass
 description: A Dart native passbook parsing library supporting checksum verification, barcode parsing, localization and much more.
-version: 2.1.4
+version: 2.2.0
 repository: https://gitlab.com/TheOneWithTheBraid/dart_pkpass.git
 homepage: https://gitlab.com/TheOneWithTheBraid/dart_pkpass
 issue_tracker: https://gitlab.com/TheOneWithTheBraid/dart_pkpass/-/issues
@@ -12,7 +12,7 @@ environment:
   sdk: ^3.4.0
 
 dependencies:
-  archive: ^3.3.7
+  archive: ^4.0.5
   barcode: ^2.2.4
   charset: ^2.0.1
   crypto: ^3.0.3
@@ -27,5 +27,5 @@ topics:
 
 dev_dependencies:
   import_sorter: ^4.6.0
-  lints: ^5.0.0
+  lints: ^6.0.0
   test: ^1.21.0