diff --git a/build.bat b/build.bat
index b055284c..f055fd4c 100644
--- a/build.bat
+++ b/build.bat
@@ -6,7 +6,7 @@ cd src
 rmdir /s /q bin
 rmdir /s /q obj
 dotnet publish SourceGit_48.csproj --nologo -c Release -r win-x86 -o ..\publish\net48
-ilrepack /ndebug /out:..\publish\SourceGit.exe ..\publish\net48\SourceGit.exe ..\publish\net48\Newtonsoft.Json.dll
+ilrepack /ndebug /wildcards /out:..\publish\SourceGit.exe ..\publish\net48\SourceGit.exe ..\publish\net48\*.dll
 cd ..\publish
 ren SourceGit.exe SourceGit_48.exe
 rmdir /s /q net48
diff --git a/src/Models/Issue.cs b/src/Models/Issue.cs
index 834e1f6c..9278e2d2 100644
--- a/src/Models/Issue.cs
+++ b/src/Models/Issue.cs
@@ -5,29 +5,14 @@ using System.Net;
 using System.Text;
 using System.Threading.Tasks;
 using System.Reflection;
-
-#if NET48
-using Newtonsoft.Json;
-#else
 using System.Text.Json;
 using System.Text.Json.Serialization;
-#endif
 
 namespace SourceGit.Models {
     /// <summary>
     ///     崩溃日志上报
     /// </summary>
     public class Issue {
-#if NET48
-        [JsonProperty(PropertyName = "access_token")]
-        public string AccessToken { get; set; }
-        [JsonProperty(PropertyName = "repo")]
-        public string Repo { get; set; }
-        [JsonProperty(PropertyName = "title")]
-        public string Title { get; set; }
-        [JsonProperty(PropertyName = "body")]
-        public string Body { get; set; }
-#else
         [JsonPropertyName("access_token")]
         public string AccessToken { get; set; }
         [JsonPropertyName("repo")]
@@ -36,7 +21,6 @@ namespace SourceGit.Models {
         public string Title { get; set; }
         [JsonPropertyName("body")]
         public string Body { get; set; }
-#endif
 
         /// <summary>
         ///     创建Gitee平台ISSUE
@@ -64,14 +48,9 @@ namespace SourceGit.Models {
                 req.Timeout = 1000;
 
                 using (var writer = req.GetRequestStream()) {
-#if NET48
-                    var data = JsonConvert.SerializeObject(issue);
+                    var data = JsonSerializer.Serialize(issue);
                     var raw = Encoding.UTF8.GetBytes(data);
                     writer.Write(raw, 0, raw.Length);
-#else
-                    var data = JsonSerializer.Serialize(issue);
-                    writer.Write(Encoding.UTF8.GetBytes(data));
-#endif
                 }
 
                 req.GetResponse();
diff --git a/src/Models/Preference.cs b/src/Models/Preference.cs
index f0dcc505..823b97a4 100644
--- a/src/Models/Preference.cs
+++ b/src/Models/Preference.cs
@@ -2,13 +2,8 @@ using Microsoft.Win32;
 using System;
 using System.Collections.Generic;
 using System.IO;
-
-#if NET48
-using Newtonsoft.Json;
-#else
 using System.Text.Json;
 using System.Text.Json.Serialization;
-#endif
 
 namespace SourceGit.Models {
 
@@ -193,11 +188,7 @@ namespace SourceGit.Models {
                 instance = new Preference();
             } else {
                 try {
-#if NET48
-                    instance = JsonConvert.DeserializeObject<Preference>(File.ReadAllText(SAVE_PATH));
-#else
                     instance = JsonSerializer.Deserialize<Preference>(File.ReadAllText(SAVE_PATH));
-#endif
                 } catch {
                     instance = new Preference();
                 }
@@ -219,12 +210,7 @@ namespace SourceGit.Models {
         public static void Save() {
             var dir = Path.GetDirectoryName(SAVE_PATH);
             if (!Directory.Exists(dir)) Directory.CreateDirectory(dir);
-
-#if NET48
-            var data = JsonConvert.SerializeObject(instance, Formatting.Indented);
-#else
             var data = JsonSerializer.Serialize(instance, new JsonSerializerOptions() { WriteIndented = true });
-#endif
             File.WriteAllText(SAVE_PATH, data);
         }
         #endregion
diff --git a/src/Models/Repository.cs b/src/Models/Repository.cs
index 36df309b..7b90f08f 100644
--- a/src/Models/Repository.cs
+++ b/src/Models/Repository.cs
@@ -1,10 +1,5 @@
 using System.Collections.Generic;
-
-#if NET48
-using Newtonsoft.Json;
-#else
 using System.Text.Json.Serialization;
-#endif
 
 namespace SourceGit.Models {
 
diff --git a/src/Models/Version.cs b/src/Models/Version.cs
index 0567c85b..19da6cfb 100644
--- a/src/Models/Version.cs
+++ b/src/Models/Version.cs
@@ -4,13 +4,8 @@ using System.Reflection;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
-
-#if NET48
-using Newtonsoft.Json;
-#else
 using System.Text.Json;
 using System.Text.Json.Serialization;
-#endif
 
 namespace SourceGit.Models {
 
@@ -18,22 +13,6 @@ namespace SourceGit.Models {
     ///     Gitee开放API中Release信息格式
     /// </summary>
     public class Version {
-#if NET48
-        [JsonProperty(PropertyName = "id")]
-        public ulong Id { get; set; }
-        [JsonProperty(PropertyName = "tag_name")]
-        public string TagName { get; set; }
-        [JsonProperty(PropertyName = "target_commitish")]
-        public string CommitSHA { get; set; }
-        [JsonProperty(PropertyName = "prerelease")]
-        public bool PreRelease { get; set; }
-        [JsonProperty(PropertyName = "name")]
-        public string Name { get; set; }
-        [JsonProperty(PropertyName = "body")]
-        public string Body { get; set; }
-        [JsonProperty(PropertyName = "created_at")]
-        public DateTime CreatedAt { get; set; }
-#else
         [JsonPropertyName("id")]
         public ulong Id { get; set; }
         [JsonPropertyName("tag_name")]
@@ -48,7 +27,7 @@ namespace SourceGit.Models {
         public string Body { get; set; }
         [JsonPropertyName("created_at")]
         public DateTime CreatedAt { get; set; }
-#endif
+
         public string PublishTime {
             get { return CreatedAt.ToLocalTime().ToString("yyyy-MM-dd HH:mm:ss"); }
         }
@@ -68,11 +47,7 @@ namespace SourceGit.Models {
                     try {
                         var web = new WebClient() { Encoding = Encoding.UTF8 };
                         var raw = web.DownloadString("https://gitee.com/api/v5/repos/sourcegit/sourcegit/releases/latest");
-#if NET48
-                        var ver = JsonConvert.DeserializeObject<Version>(raw);
-#else
                         var ver = JsonSerializer.Deserialize<Version>(raw);
-#endif
                         var cur = Assembly.GetExecutingAssembly().GetName().Version;
 
                         var matches = Regex.Match(ver.TagName, @"^v(\d+)\.(\d+).*");
diff --git a/src/SourceGit_48.csproj b/src/SourceGit_48.csproj
index 0731cf71..1f1bc156 100644
--- a/src/SourceGit_48.csproj
+++ b/src/SourceGit_48.csproj
@@ -20,6 +20,6 @@
         <AssemblyName>SourceGit</AssemblyName>
     </PropertyGroup>
     <ItemGroup>
-      <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+      <PackageReference Include="System.Text.Json" Version="5.0.2" />
     </ItemGroup>
 </Project>
\ No newline at end of file