diff --git a/src/VaultSharp/Core/Polymath.cs b/src/VaultSharp/Core/Polymath.cs
index bab2e03..84637c3 100644
--- a/src/VaultSharp/Core/Polymath.cs
+++ b/src/VaultSharp/Core/Polymath.cs
@@ -12,6 +12,7 @@
 using VaultSharp.V1.Commons;
 using System.Text.Json.Nodes;
 using System.Text.Json;
+using System.Net.Http.Json;
 
 namespace VaultSharp.Core
 {
@@ -199,7 +200,7 @@ public async Task MakeVaultApiRequest(string resourcePath, HttpMethod httpMethod
                 var requestUri = new Uri(_httpClient.BaseAddress, new Uri(resourcePath, UriKind.Relative));
 
                 var requestContent = requestData != null
-                    ? new StringContent(JsonSerializer.Serialize(requestData), Encoding.UTF8)
+                    ? JsonContent.Create(requestData)
                     : null;
 
                 HttpRequestMessage httpRequestMessage = null;
@@ -233,7 +234,7 @@ public async Task MakeVaultApiRequest(string resourcePath, HttpMethod httpMethod
                         httpRequestMessage = new HttpRequestMessage(httpMethod, requestUri)
                         {
                             Content = requestData != null 
-                            ? new StringContent(JsonSerializer.Serialize(requestData), Encoding.UTF8, "application/merge-patch+json")
+                            ? JsonContent.Create(requestData, mediaType: new System.Net.Http.Headers.MediaTypeHeaderValue("application/merge-patch+json"))
                             : null
                         };
 
diff --git a/src/VaultSharp/VaultSharp.csproj b/src/VaultSharp/VaultSharp.csproj
index 4accb0c..4778562 100644
--- a/src/VaultSharp/VaultSharp.csproj
+++ b/src/VaultSharp/VaultSharp.csproj
@@ -96,6 +96,9 @@ This library is built with .NET Standard 2.0, .NET Standard 2.1, 4.6.2, 4.7.2*,
     <PackageReference Include="System.Text.Json">
       <Version>7.0.2</Version>
     </PackageReference>
+    <PackageReference Include="System.Net.Http.Json">
+      <Version>7.0.1</Version>
+    </PackageReference>
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net47'">
@@ -105,6 +108,9 @@ This library is built with .NET Standard 2.0, .NET Standard 2.1, 4.6.2, 4.7.2*,
     <PackageReference Include="System.Text.Json">
       <Version>7.0.2</Version>
     </PackageReference>
+    <PackageReference Include="System.Net.Http.Json">
+      <Version>7.0.1</Version>
+    </PackageReference>
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net471'">
@@ -114,6 +120,9 @@ This library is built with .NET Standard 2.0, .NET Standard 2.1, 4.6.2, 4.7.2*,
     <PackageReference Include="System.Text.Json">
       <Version>7.0.2</Version>
     </PackageReference>
+    <PackageReference Include="System.Net.Http.Json">
+      <Version>7.0.1</Version>
+    </PackageReference>
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net472'">
@@ -123,6 +132,9 @@ This library is built with .NET Standard 2.0, .NET Standard 2.1, 4.6.2, 4.7.2*,
     <PackageReference Include="System.Text.Json">
       <Version>7.0.2</Version>
     </PackageReference>
+    <PackageReference Include="System.Net.Http.Json">
+      <Version>7.0.1</Version>
+    </PackageReference>
   </ItemGroup>
   
   <PropertyGroup Condition="'$(TargetFramework)' == 'net48'">
@@ -136,6 +148,9 @@ This library is built with .NET Standard 2.0, .NET Standard 2.1, 4.6.2, 4.7.2*,
     <PackageReference Include="System.Text.Json">
       <Version>7.0.2</Version>
     </PackageReference>
+    <PackageReference Include="System.Net.Http.Json">
+      <Version>7.0.1</Version>
+    </PackageReference>
   </ItemGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'net481'">
@@ -149,6 +164,9 @@ This library is built with .NET Standard 2.0, .NET Standard 2.1, 4.6.2, 4.7.2*,
     <PackageReference Include="System.Text.Json">
       <Version>7.0.2</Version>
     </PackageReference>
+    <PackageReference Include="System.Net.Http.Json">
+      <Version>7.0.1</Version>
+    </PackageReference>
   </ItemGroup>
 
 
@@ -160,6 +178,9 @@ This library is built with .NET Standard 2.0, .NET Standard 2.1, 4.6.2, 4.7.2*,
     <PackageReference Include="System.Text.Json">
       <Version>7.0.2</Version>
     </PackageReference>
+    <PackageReference Include="System.Net.Http.Json">
+      <Version>7.0.1</Version>
+    </PackageReference>
   </ItemGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'netstandard2.1'">
@@ -170,6 +191,9 @@ This library is built with .NET Standard 2.0, .NET Standard 2.1, 4.6.2, 4.7.2*,
     <PackageReference Include="System.Text.Json">
       <Version>7.0.2</Version>
     </PackageReference>
+    <PackageReference Include="System.Net.Http.Json">
+      <Version>7.0.1</Version>
+    </PackageReference>
   </ItemGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)'=='net6.0'">