diff --git a/src/SocketIO.Serializer.SystemTextJson/SocketIO.Serializer.SystemTextJson.csproj b/src/SocketIO.Serializer.SystemTextJson/SocketIO.Serializer.SystemTextJson.csproj
index ab85d3f6..19137e87 100644
--- a/src/SocketIO.Serializer.SystemTextJson/SocketIO.Serializer.SystemTextJson.csproj
+++ b/src/SocketIO.Serializer.SystemTextJson/SocketIO.Serializer.SystemTextJson.csproj
@@ -1,7 +1,7 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFrameworks>netstandard2.0;net6.0</TargetFrameworks>
     <LangVersion>latest</LangVersion>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>../SocketIOClient/SocketIOClient.snk</AssemblyOriginatorKeyFile>
@@ -18,7 +18,7 @@
     <ProjectReference Include="..\SocketIO.Serializer.Core\SocketIO.Serializer.Core.csproj" />
   </ItemGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
     <PackageReference Include="System.Text.Json" Version="9.0.4" />
   </ItemGroup>