diff --git a/lib/models/file_metadata.dart b/lib/models/file_metadata.dart
index 6e1d9ed..60d23c2 100644
--- a/lib/models/file_metadata.dart
+++ b/lib/models/file_metadata.dart
@@ -23,10 +23,6 @@ class FileMetadata extends base.FileMetadata with DataModelMixin<FileMetadata> {
         super.fromJson();
 
   Map<String, dynamic> toJson() => super.toMap();
-
-  // String? get version => tagMap['version']?.firstOrNull;
-  int? get versionCode => int.tryParse(event.getTag('version') ?? '');
-  String? get apkSignatureHash => event.getTag('apk_signature_hash');
 }
 
 mixin FileMetadataAdapter on Adapter<FileMetadata> {
diff --git a/lib/models/local_app.dart b/lib/models/local_app.dart
index 7058dce..1884eed 100644
--- a/lib/models/local_app.dart
+++ b/lib/models/local_app.dart
@@ -10,6 +10,7 @@ import 'package:zapstore/main.data.dart';
 import 'package:zapstore/models/app.dart';
 import 'package:zapstore/utils/extensions.dart';
 import 'package:zapstore/utils/system_info.dart';
+import 'package:zapstore/utils/version.dart';
 
 part 'local_app.g.dart';
 
@@ -166,8 +167,9 @@ mixin LocalAppAdapter on Adapter<LocalApp> {
       comp = app.latestMetadata!.versionCode!.compareTo(code);
     }
 
+    // If versionCode was not available or not enough, compare string version
     if (comp == 0) {
-      comp = app.latestMetadata!.version!.compareTo(installedVersion);
+      comp = compareVersions(installedVersion, app.latestMetadata!.version!);
     }
 
     if (comp == 1) return AppInstallStatus.updatable;
diff --git a/lib/utils/version.dart b/lib/utils/version.dart
new file mode 100644
index 0000000..d6545f7
--- /dev/null
+++ b/lib/utils/version.dart
@@ -0,0 +1,40 @@
+import 'dart:math';
+
+int compareVersions(String version1, String version2) {
+  // Split the versions into main and pre-release components
+  final parts1 = version1.split('-');
+  final parts2 = version2.split('-');
+
+  // Split the main version into numeric parts
+  final mainVersion1 = parts1[0].split('.').map(int.parse).toList();
+  final mainVersion2 = parts2[0].split('.').map(int.parse).toList();
+
+  // Compare the main version parts
+  for (var i = 0; i < max(mainVersion1.length, mainVersion2.length); i++) {
+    final v1 = i < mainVersion1.length ? mainVersion1[i] : 0;
+    final v2 = i < mainVersion2.length ? mainVersion2[i] : 0;
+
+    if (v1 < v2) return 1; // version2 is higher
+    if (v1 > v2) return -1; // version1 is higher
+  }
+
+  // If main versions are equal, compare pre-release versions if they exist
+  final preRelease1 = parts1.length > 1 ? parts1[1] : '';
+  final preRelease2 = parts2.length > 1 ? parts2[1] : '';
+
+  if (preRelease1.isEmpty && preRelease2.isNotEmpty)
+    return -1; // version2 is higher
+  if (preRelease2.isEmpty && preRelease1.isNotEmpty)
+    return 1; // version1 is higher
+
+  if (preRelease1.isEmpty && preRelease2.isEmpty) return 0; // both are equal
+
+  // Compare pre-release versions lexicographically
+  final comparison = preRelease1.compareTo(preRelease2);
+
+  return comparison < 0
+      ? -1
+      : comparison > 0
+          ? 1
+          : 0;
+}
diff --git a/pubspec.lock b/pubspec.lock
index 8df2ca8..4aa7bd8 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -1018,8 +1018,8 @@ packages:
     dependency: "direct main"
     description:
       path: "."
-      ref: "6e7c86bc98a8a08b67b8fe8f70d3fcbd58d6476c"
-      resolved-ref: "6e7c86bc98a8a08b67b8fe8f70d3fcbd58d6476c"
+      ref: "512eab9828d2d1ca9e1b7e48a5742a3b08b9b99f"
+      resolved-ref: "512eab9828d2d1ca9e1b7e48a5742a3b08b9b99f"
       url: "https://github.com/purplebase/purplebase"
     source: git
     version: "0.2.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index 77fade0..2c5cb58 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -60,7 +60,7 @@ dependency_overrides:
     # path: ../../purplebase/purplebase
     git:
       url: https://github.com/purplebase/purplebase
-      ref: 6e7c86bc98a8a08b67b8fe8f70d3fcbd58d6476c
+      ref: 512eab9828d2d1ca9e1b7e48a5742a3b08b9b99f
   flutter_data:
     git:
       url: https://github.com/zapstore/flutter_data
diff --git a/test/version_test.dart b/test/version_test.dart
new file mode 100644
index 0000000..587b84e
--- /dev/null
+++ b/test/version_test.dart
@@ -0,0 +1,18 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:zapstore/utils/version.dart';
+
+void main() {
+  group('version parsing', () {
+    test('returns correct comparison', () {
+      expect(compareVersions("1.2.3", "1.2.3"), 0);
+      expect(compareVersions("1.2.3", "1.2.3-alpha"), -1);
+      expect(compareVersions("1.2.3-alpha", "1.2.3-beta"), -1);
+      expect(compareVersions("1.2.3-beta", "1.2.3-alpha"), 1);
+      expect(compareVersions("1.9.0", "1.10.0"), 1);
+      expect(compareVersions("1.26.8", "1.27.2"), 1);
+      expect(compareVersions("0.2.7", "0.2.11"), 1);
+      expect(compareVersions("0.2.11", "0.2.7"), -1);
+      expect(compareVersions("2024.9", "2024.10-beta2"), 1);
+    });
+  });
+}