diff --git a/src/DotNetCore.CAP.Kafka/IConnectionPool.Default.cs b/src/DotNetCore.CAP.Kafka/IConnectionPool.Default.cs
index 0271d1d..69d22c5 100644
--- a/src/DotNetCore.CAP.Kafka/IConnectionPool.Default.cs
+++ b/src/DotNetCore.CAP.Kafka/IConnectionPool.Default.cs
@@ -3,11 +3,11 @@
 
 using System;
 using System.Collections.Concurrent;
-using System.Text.Json;
 using System.Threading;
 using Confluent.Kafka;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using Newtonsoft.Json;
 
 namespace DotNetCore.CAP.Kafka
 {
@@ -24,7 +24,7 @@ namespace DotNetCore.CAP.Kafka
             _producerPool = new ConcurrentQueue<IProducer<string, byte[]>>();
             _maxSize = _options.ConnectionPoolSize;
 
-            logger.LogDebug("Kafka configuration of CAP :\r\n {0}", JsonSerializer.Serialize(_options.AsKafkaConfig()));
+            logger.LogDebug("Kafka configuration of CAP :\r\n {0}", JsonConvert.SerializeObject(_options.AsKafkaConfig()));
         }
 
         public string ServersAddress => _options.Servers;
diff --git a/src/DotNetCore.CAP/DotNetCore.CAP.csproj b/src/DotNetCore.CAP/DotNetCore.CAP.csproj
index b3667f3..2bfc74f 100644
--- a/src/DotNetCore.CAP/DotNetCore.CAP.csproj
+++ b/src/DotNetCore.CAP/DotNetCore.CAP.csproj
@@ -13,8 +13,8 @@
     <PackageReference Include="JetBrains.Annotations" Version="2019.1.3" />
     <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="3.0.0" />
     <PackageReference Include="Microsoft.Extensions.Options" Version="3.0.0" />
+    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
     <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="4.6.0" />
-    <PackageReference Include="System.Text.Json" Version="4.6.0" />
   </ItemGroup>
  
 </Project>
\ No newline at end of file
diff --git a/src/DotNetCore.CAP/Serialization/ISerializer.JsonUtf8.cs b/src/DotNetCore.CAP/Serialization/ISerializer.JsonUtf8.cs
index 5362342..f638751 100644
--- a/src/DotNetCore.CAP/Serialization/ISerializer.JsonUtf8.cs
+++ b/src/DotNetCore.CAP/Serialization/ISerializer.JsonUtf8.cs
@@ -1,7 +1,11 @@
-using System;
+// Copyright (c) .NET Core Community. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for license information.
+
+using System;
+using System.Text;
 using System.Threading.Tasks;
 using DotNetCore.CAP.Messages;
-using System.Text.Json;
+using Newtonsoft.Json;
 
 namespace DotNetCore.CAP.Serialization
 {
@@ -9,7 +13,8 @@ namespace DotNetCore.CAP.Serialization
     {
         public Task<TransportMessage> SerializeAsync(Message message)
         {
-            return Task.FromResult(new TransportMessage(message.Headers, JsonSerializer.SerializeToUtf8Bytes(message.Value)));
+            var json = JsonConvert.SerializeObject(message.Value);
+            return Task.FromResult(new TransportMessage(message.Headers, Encoding.UTF8.GetBytes(json)));
         }
 
         public Task<Message> DeserializeAsync(TransportMessage transportMessage, Type valueType)
@@ -19,7 +24,8 @@ namespace DotNetCore.CAP.Serialization
                 return Task.FromResult(new Message(transportMessage.Headers, null));
             }
 
-            return Task.FromResult(new Message(transportMessage.Headers, JsonSerializer.Deserialize(transportMessage.Body, valueType)));
+            var json = Encoding.UTF8.GetString(transportMessage.Body);
+            return Task.FromResult(new Message(transportMessage.Headers, JsonConvert.DeserializeObject(json, valueType)));
         }
     }
 }
diff --git a/src/DotNetCore.CAP/Serialization/ISerializer.cs b/src/DotNetCore.CAP/Serialization/ISerializer.cs
index c38d064..0c831f7 100644
--- a/src/DotNetCore.CAP/Serialization/ISerializer.cs
+++ b/src/DotNetCore.CAP/Serialization/ISerializer.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) .NET Core Community. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for license information.
+
+using System;
 using System.Threading.Tasks;
 using DotNetCore.CAP.Messages;
 using JetBrains.Annotations;
diff --git a/src/DotNetCore.CAP/Serialization/StringSerializer.cs b/src/DotNetCore.CAP/Serialization/StringSerializer.cs
index 8e89111..3c96647 100644
--- a/src/DotNetCore.CAP/Serialization/StringSerializer.cs
+++ b/src/DotNetCore.CAP/Serialization/StringSerializer.cs
@@ -1,5 +1,8 @@
-using DotNetCore.CAP.Messages;
-using System.Text.Json;
+// Copyright (c) .NET Core Community. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for license information.
+
+using DotNetCore.CAP.Messages;
+using Newtonsoft.Json;
 
 namespace DotNetCore.CAP.Serialization
 {
@@ -7,12 +10,12 @@ namespace DotNetCore.CAP.Serialization
     {
         public static string Serialize(Message message)
         {
-            return JsonSerializer.Serialize(message);
+            return JsonConvert.SerializeObject(message);
         }
 
         public static Message DeSerialize(string json)
         {
-            return JsonSerializer.Deserialize<Message>(json);
+            return JsonConvert.DeserializeObject<Message>(json);
         }
     }
 }
\ No newline at end of file