diff --git a/OwnChar b/OwnChar
index b2f0a80..270a017 160000
--- a/OwnChar
+++ b/OwnChar
@@ -1 +1 @@
-Subproject commit b2f0a80872ccb736dd58eb95512d70a19087fa6e
+Subproject commit 270a01791c50011b9629e63d08c0298b9b4d67ad
diff --git a/OwnChar.App.Desktop/UI/Windows/MainWindow.cs b/OwnChar.App.Desktop/UI/Windows/MainWindow.cs
index 061d1ae..46ffe9c 100644
--- a/OwnChar.App.Desktop/UI/Windows/MainWindow.cs
+++ b/OwnChar.App.Desktop/UI/Windows/MainWindow.cs
@@ -1,6 +1,8 @@
 using OwnChar.App.Desktop.Api;
 using OwnChar.App.Desktop.Api.Parameters;
 using OwnChar.Data;
+using OwnChar.Data.Managers;
+using OwnChar.Data.Providers.JsonFile;
 using OwnChar.Manager;
 using Pilz.Plugins.Advanced;
 using Pilz.Plugins.Advanced.UI.Telerik;
@@ -13,7 +15,8 @@ namespace OwnChar.App.Desktop.UI.Windows
 {
     public partial class MainWindow : RadTabbedForm
     {
-        private readonly OwnCharManager? manager = new(new JsonFileDataProvider());
+        private readonly OwnCharManager manager = new();
+        private readonly IDataManager dataManager = new DefaultDataManager(new JsonFileDataProvider("test.json"));
 
         public MainWindowApi Api { get; }
 
@@ -28,7 +31,7 @@ namespace OwnChar.App.Desktop.UI.Windows
         {
             public MainWindow MainWindow { get; } = mainWindow;
 
-            public OwnCharManager? Manager => MainWindow.manager;
+            public OwnCharManager Manager => MainWindow.manager;
 
             public void OpenTab(Control content, string title)
             {