diff --git a/Helpers/SimApiUtil.cs b/Helpers/SimApiUtil.cs
index cded92d..af35990 100644
--- a/Helpers/SimApiUtil.cs
+++ b/Helpers/SimApiUtil.cs
@@ -24,10 +24,10 @@ public static class SimApiUtil
     /// </summary>
     public static JsonSerializerOptions JsonOption => new()
     {
-        ReferenceHandler = ReferenceHandler.Preserve,
+        // ReferenceHandler = ReferenceHandler.Preserve,
         Encoder = JavaScriptEncoder.Create(UnicodeRanges.All),
         PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
-        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
+        // DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
     };
 
     /// <summary>
diff --git a/SimApi.csproj b/SimApi.csproj
index ac39b06..91d4719 100644
--- a/SimApi.csproj
+++ b/SimApi.csproj
@@ -14,8 +14,8 @@
         <SynchReleaseVersion>false</SynchReleaseVersion>
         <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
         <PackageVersion>5.0.2</PackageVersion>
-        <TargetFramework>net8.0</TargetFramework>
         <Nullable>enable</Nullable>
+        <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
     </PropertyGroup>
 
     <ItemGroup>
diff --git a/SimApiExtensions.cs b/SimApiExtensions.cs
index ec50def..7a1a22f 100644
--- a/SimApiExtensions.cs
+++ b/SimApiExtensions.cs
@@ -3,7 +3,6 @@ using System.Diagnostics;
 using System.Linq;
 using System.Reflection;
 using System.Text.Json;
-using System.Text.Json.Serialization;
 using Hangfire;
 using Hangfire.Console;
 using Hangfire.Redis.StackExchange;