diff --git a/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/Controllers/ProductController.cs b/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/Controllers/ProductController.cs
index 6ce51f034a..188b7693d2 100644
--- a/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/Controllers/ProductController.cs
+++ b/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/Controllers/ProductController.cs
@@ -1,5 +1,4 @@
 using Microsoft.AspNetCore.Mvc;
-using Newtonsoft.Json;
 
 namespace GlobalDefaultJsonSerializationoptions.Controllers;
 
@@ -16,6 +15,6 @@ public ActionResult CreateProduct(Product product)
     [HttpPost("save")]
     public ActionResult SaveProduct(Product product)
     {
-        return Ok(JsonConvert.SerializeObject(product));
+        return Ok(product);
     }
 }
diff --git a/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions.csproj b/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions.csproj
index c7cc13203b..a2273d15df 100644
--- a/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions.csproj
+++ b/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions.csproj
@@ -1,15 +1,15 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <InvariantGlobalization>true</InvariantGlobalization>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="10.0.10" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="10.2.3" />
   </ItemGroup>
 
 </Project>
diff --git a/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/Program.cs b/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/Program.cs
index 0397cc9e1d..5f0c309cb6 100644
--- a/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/Program.cs
+++ b/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptions/Program.cs
@@ -25,7 +25,7 @@
 
 builder.Services.ConfigureHttpJsonOptions(options =>
 {
-    options.SerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
+    options.SerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseUpper;
     options.SerializerOptions.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull;
     options.SerializerOptions.WriteIndented = false;
     options.SerializerOptions.Encoder = JavaScriptEncoder.Default;
@@ -34,15 +34,15 @@
     options.SerializerOptions.NumberHandling = JsonNumberHandling.AllowReadingFromString;
 });
 
-JsonConvert.DefaultSettings = () => new JsonSerializerSettings
+builder.Services.AddControllers().AddNewtonsoftJson(options =>
 {
-    ContractResolver = new CamelCasePropertyNamesContractResolver(),
-    Formatting = Formatting.Indented,
-    NullValueHandling = NullValueHandling.Ignore,
-    DateFormatString = "dd-MM-yyyy",
-    DefaultValueHandling = DefaultValueHandling.Ignore,
-    MaxDepth = 3
-};
+    options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
+    options.SerializerSettings.Formatting = Formatting.Indented;
+    options.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;
+    options.SerializerSettings.DateFormatString = "dd-MM-yyyy";
+    options.SerializerSettings.DefaultValueHandling = DefaultValueHandling.Ignore;
+    options.SerializerSettings.MaxDepth = 3;
+});
 
 var app = builder.Build();
 
diff --git a/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptionsUnitTests/GlobalDefaultJsonSerializationoptionsUnitTests.csproj b/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptionsUnitTests/GlobalDefaultJsonSerializationoptionsUnitTests.csproj
index f0985e8813..08d8727141 100644
--- a/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptionsUnitTests/GlobalDefaultJsonSerializationoptionsUnitTests.csproj
+++ b/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptionsUnitTests/GlobalDefaultJsonSerializationoptionsUnitTests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
 
@@ -10,11 +10,11 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.4" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="3.0.4" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.0.4" />
-    <PackageReference Include="coverlet.collector" Version="6.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.10" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.11.1" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.11.1" />
+    <PackageReference Include="coverlet.collector" Version="10.0.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptionsUnitTests/ProductControllerUnitTests.cs b/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptionsUnitTests/ProductControllerUnitTests.cs
index d49a23d6e6..f803382284 100644
--- a/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptionsUnitTests/ProductControllerUnitTests.cs
+++ b/json-csharp/GlobalDefaultJsonSerializationoptions/GlobalDefaultJsonSerializationoptionsUnitTests/ProductControllerUnitTests.cs
@@ -2,7 +2,6 @@
 using GlobalDefaultJsonSerializationoptions.Controllers;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
-using Newtonsoft.Json;
 
 namespace GlobalDefaultJsonSerializationoptionsUnitTests;
 
@@ -42,8 +41,6 @@ public void GivenValidProduct_WhenSaveProductIsCalled_ThenReturnsProductWithSame
         // Assert
         Assert.IsNotNull(result);
         Assert.AreEqual(200, result.StatusCode);
-
-        var expectedJson = JsonConvert.SerializeObject(product);
-        Assert.AreEqual(expectedJson, result?.Value?.ToString());
+        Assert.AreEqual(product, result.Value);
     }
 }