diff --git a/src/SKIT.FlurlHttpClient.Wechat.Api/Converters/System.Text.Json/Boolean/TextualBooleanConverter.cs b/src/SKIT.FlurlHttpClient.Wechat.Api/Converters/System.Text.Json/Boolean/TextualBooleanConverter.cs
deleted file mode 100644
index 84b68a26..00000000
--- a/src/SKIT.FlurlHttpClient.Wechat.Api/Converters/System.Text.Json/Boolean/TextualBooleanConverter.cs
+++ /dev/null
@@ -1,22 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-
-namespace System.Text.Json.Converters
-{
-    internal class TextualBooleanConverter : JsonConverter<bool>
-    {
-        private readonly JsonConverter<bool?> _converter = new TextualNullableBooleanConverter();
-
-        public override bool Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
-        {
-            return _converter.Read(ref reader, typeToConvert, options) ?? default;
-        }
-
-        public override void Write(Utf8JsonWriter writer, bool value, JsonSerializerOptions options)
-        {
-            _converter.Write(writer, value, options);
-        }
-    }
-}
diff --git a/src/SKIT.FlurlHttpClient.Wechat.Api/Converters/System.Text.Json/Boolean/TextualNullableBooleanConverter.cs b/src/SKIT.FlurlHttpClient.Wechat.Api/Converters/System.Text.Json/Boolean/TextualNullableBooleanConverter.cs
deleted file mode 100644
index bd6598ba..00000000
--- a/src/SKIT.FlurlHttpClient.Wechat.Api/Converters/System.Text.Json/Boolean/TextualNullableBooleanConverter.cs
+++ /dev/null
@@ -1,44 +0,0 @@
-using System.Text.Json.Serialization;
-
-namespace System.Text.Json.Converters
-{
-    internal class TextualNullableBooleanConverter : JsonConverter<bool?>
-    {
-        public override bool? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
-        {
-            if (reader.TokenType == JsonTokenType.Null)
-            {
-                return null;
-            }
-            else if (reader.TokenType == JsonTokenType.True)
-            {
-                return true;
-            }
-            else if (reader.TokenType == JsonTokenType.False)
-            {
-                return false;
-            }
-            else if (reader.TokenType == JsonTokenType.String)
-            {
-                string? value = reader.GetString();
-                if (value == null)
-                    return null;
-
-                if ("true".Equals(value, StringComparison.OrdinalIgnoreCase))
-                    return true;
-                else if ("false".Equals(value, StringComparison.OrdinalIgnoreCase))
-                    return false;
-            }
-
-            throw new JsonException();
-        }
-
-        public override void Write(Utf8JsonWriter writer, bool? value, JsonSerializerOptions options)
-        {
-            if (value.HasValue)
-                writer.WriteStringValue(value.Value ? "true" : "false");
-            else
-                writer.WriteNullValue();
-        }
-    }
-}