diff --git a/src/Cnblogs.DashScope.Core/Cnblogs.DashScope.Core.csproj b/src/Cnblogs.DashScope.Core/Cnblogs.DashScope.Core.csproj
index 7d46d37..b164ed0 100644
--- a/src/Cnblogs.DashScope.Core/Cnblogs.DashScope.Core.csproj
+++ b/src/Cnblogs.DashScope.Core/Cnblogs.DashScope.Core.csproj
@@ -13,6 +13,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.DeepDev.TokenizerLib" Version="1.3.3" />
+    <PackageReference Include="System.Text.Json" Version="8.0.5" />
   </ItemGroup>
   
 </Project>
diff --git a/src/Cnblogs.DashScope.Core/DashScopeClientCore.cs b/src/Cnblogs.DashScope.Core/DashScopeClientCore.cs
index fdbed71..e0f3159 100644
--- a/src/Cnblogs.DashScope.Core/DashScopeClientCore.cs
+++ b/src/Cnblogs.DashScope.Core/DashScopeClientCore.cs
@@ -18,7 +18,7 @@ public class DashScopeClientCore : IDashScopeClient
         new()
         {
             DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
-            PropertyNamingPolicy = JsonSnakeCaseLowerNamingPolicy.SnakeCaseLower,
+            PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower
         };
 
     private readonly HttpClient _httpClient;
diff --git a/src/Cnblogs.DashScope.Core/Internals/JsonSeparatorNamingPolicy.cs b/src/Cnblogs.DashScope.Core/Internals/JsonSeparatorNamingPolicy.cs
deleted file mode 100644
index 761ae20..0000000
--- a/src/Cnblogs.DashScope.Core/Internals/JsonSeparatorNamingPolicy.cs
+++ /dev/null
@@ -1,128 +0,0 @@
-using System.Buffers;
-using System.Globalization;
-using System.Runtime.CompilerServices;
-using System.Text.Json;
-
-namespace Cnblogs.DashScope.Core.Internals;
-
-// back-porting from dotnet/runtime
-internal abstract class JsonSeparatorNamingPolicy : JsonNamingPolicy
-{
-    private readonly bool _lowercase;
-    private readonly char _separator;
-
-    internal JsonSeparatorNamingPolicy(bool lowercase, char separator)
-    {
-        _lowercase = lowercase;
-        _separator = separator;
-    }
-
-    public sealed override string ConvertName(string? name)
-    {
-        if (name == null)
-        {
-            throw new ArgumentNullException(nameof(name));
-        }
-
-        return ConvertNameCore(_separator, _lowercase, name.AsSpan());
-    }
-
-    private static string ConvertNameCore(char separator, bool lowercase, ReadOnlySpan<char> chars)
-    {
-        var rentedBuffer = (char[]?)null;
-        var minimumLength = (int)(1.2 * chars.Length);
-        var destination = minimumLength > 128 /*0x80*/
-            ? (Span<char>)(rentedBuffer = ArrayPool<char>.Shared.Rent(minimumLength))
-            : stackalloc char[128 /*0x80*/];
-        var separatorState = SeparatorState.NotStarted;
-        var charsWritten = 0;
-        for (var index = 0; index < chars.Length; ++index)
-        {
-            var c = chars[index];
-            var unicodeCategory = char.GetUnicodeCategory(c);
-            switch (unicodeCategory)
-            {
-                case UnicodeCategory.UppercaseLetter:
-                    switch (separatorState)
-                    {
-                        case SeparatorState.UppercaseLetter:
-                            if (index + 1 < chars.Length && char.IsLower(chars[index + 1]))
-                            {
-                                WriteChar(separator, ref destination);
-                            }
-
-                            break;
-                        case SeparatorState.LowercaseLetterOrDigit:
-                        case SeparatorState.SpaceSeparator:
-                            WriteChar(separator, ref destination);
-                            break;
-                    }
-
-                    if (lowercase)
-                        c = char.ToLowerInvariant(c);
-                    WriteChar(c, ref destination);
-                    separatorState = SeparatorState.UppercaseLetter;
-                    break;
-                case UnicodeCategory.LowercaseLetter:
-                case UnicodeCategory.DecimalDigitNumber:
-                    if (separatorState == SeparatorState.SpaceSeparator)
-                        WriteChar(separator, ref destination);
-                    if (!lowercase && unicodeCategory == UnicodeCategory.LowercaseLetter)
-                        c = char.ToUpperInvariant(c);
-                    WriteChar(c, ref destination);
-                    separatorState = SeparatorState.LowercaseLetterOrDigit;
-                    break;
-                case UnicodeCategory.SpaceSeparator:
-                    if (separatorState != SeparatorState.NotStarted)
-                    {
-                        separatorState = SeparatorState.SpaceSeparator;
-                    }
-
-                    break;
-                default:
-                    WriteChar(c, ref destination);
-                    separatorState = SeparatorState.NotStarted;
-                    break;
-            }
-        }
-
-        var str = destination.Slice(0, charsWritten).ToString();
-        if (rentedBuffer != null)
-        {
-            destination.Slice(0, charsWritten).Clear();
-            ArrayPool<char>.Shared.Return(rentedBuffer);
-        }
-
-        return str;
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        void WriteChar(char value, ref Span<char> destination)
-        {
-            if (charsWritten == destination.Length)
-                ExpandBuffer(ref destination);
-            destination[charsWritten++] = value;
-        }
-
-        void ExpandBuffer(ref Span<char> destination)
-        {
-            var destination1 = ArrayPool<char>.Shared.Rent(checked(destination.Length * 2));
-            destination.CopyTo((Span<char>)destination1);
-            if (rentedBuffer != null)
-            {
-                destination.Slice(0, charsWritten).Clear();
-                ArrayPool<char>.Shared.Return(rentedBuffer);
-            }
-
-            rentedBuffer = destination1;
-            destination = (Span<char>)rentedBuffer;
-        }
-    }
-
-    private enum SeparatorState
-    {
-        NotStarted,
-        UppercaseLetter,
-        LowercaseLetterOrDigit,
-        SpaceSeparator,
-    }
-}
diff --git a/src/Cnblogs.DashScope.Core/Internals/JsonSnakeCaseLowerNamingPolicy.cs b/src/Cnblogs.DashScope.Core/Internals/JsonSnakeCaseLowerNamingPolicy.cs
deleted file mode 100644
index 23d1f48..0000000
--- a/src/Cnblogs.DashScope.Core/Internals/JsonSnakeCaseLowerNamingPolicy.cs
+++ /dev/null
@@ -1,11 +0,0 @@
-namespace Cnblogs.DashScope.Core.Internals;
-
-internal class JsonSnakeCaseLowerNamingPolicy : JsonSeparatorNamingPolicy
-{
-    public static readonly JsonSnakeCaseLowerNamingPolicy SnakeCaseLower = new();
-
-    private JsonSnakeCaseLowerNamingPolicy()
-        : base(true, '_')
-    {
-    }
-}