diff --git a/TsinghuaNet.XF/TsinghuaNet.XF.iOS/Main.cs b/TsinghuaNet.XF/TsinghuaNet.XF.iOS/Main.cs
index ba0a33c..3562906 100644
--- a/TsinghuaNet.XF/TsinghuaNet.XF.iOS/Main.cs
+++ b/TsinghuaNet.XF/TsinghuaNet.XF.iOS/Main.cs
@@ -9,7 +9,7 @@ static void Main(string[] args)
         {
             // if you want to use a different Application Delegate class from "AppDelegate"
             // you can specify it here.
-            UIApplication.Main(args, null, "AppDelegate");
+            UIApplication.Main(args, null, typeof(AppDelegate));
         }
     }
 }
diff --git a/TsinghuaNet.XF/TsinghuaNet.XF.iOS/TsinghuaNet.XF.iOS.csproj b/TsinghuaNet.XF/TsinghuaNet.XF.iOS/TsinghuaNet.XF.iOS.csproj
index 1c0f8b2..49a0890 100644
--- a/TsinghuaNet.XF/TsinghuaNet.XF.iOS/TsinghuaNet.XF.iOS.csproj
+++ b/TsinghuaNet.XF/TsinghuaNet.XF.iOS/TsinghuaNet.XF.iOS.csproj
@@ -54,7 +54,6 @@
     <CodesignKey>Apple Development: strawberry_str@hotmail.com (MBF6HUAPAZ)</CodesignKey>
     <MtouchDebug>true</MtouchDebug>
     <MtouchI18n>cjk</MtouchI18n>
-    <CodesignProvision>iOS Team Provisioning Profile: com.berrysoft.TsinghuaNet.XF</CodesignProvision>
     <CodesignExtraArgs />
     <CodesignResourceRules />
     <MtouchLink>None</MtouchLink>
@@ -75,6 +74,7 @@
     <CodesignEntitlements>Entitlements.plist</CodesignEntitlements>
     <MtouchFloat32>true</MtouchFloat32>
     <MtouchExtraArgs>--linkskip=Xamarin.Forms.Core --linkskip=Xamarin.Forms.Platform --linkskip=Xamarin.Forms.Platform.iOS --linkskip=Xamarin.Forms.Xaml --linkskip=Syncfusion.Core.XForms --linkskip=Syncfusion.SfChart.XForms --linkskip=Syncfusion.SfComboBox.XForms --linkskip=Syncfusion.SfDataGrid.XForms --linkskip=Syncfusion.SfNumericTextBox.XForms --linkskip=Syncfusion.SfPopupLayout.XForms --linkskip=TsinghuaNet --linkskip=TsinghuaNet.XF --linkskip=TsinghuaNet.XF.iOS</MtouchExtraArgs>
+    <BuildIpa>true</BuildIpa>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(RunConfiguration)' == 'Default' ">
     <AppExtensionDebugBundleId />
diff --git a/TsinghuaNet/TsinghuaNet.csproj b/TsinghuaNet/TsinghuaNet.csproj
index 57337c6..59877f3 100644
--- a/TsinghuaNet/TsinghuaNet.csproj
+++ b/TsinghuaNet/TsinghuaNet.csproj
@@ -18,7 +18,7 @@
     </PackageReference>
     <PackageReference Include="Refractored.MvvmHelpers" Version="1.6.2" />
     <PackageReference Include="System.Linq.Async" Version="5.0.0" />
-    <PackageReference Include="System.Text.Json" Version="6.0.0" />
+    <PackageReference Include="System.Text.Json" Version="5.0.2" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">