diff --git a/src/Util/XmlUtil.cs b/src/Util/XmlUtil.cs
index ec31f93..aaaaa2e 100644
--- a/src/Util/XmlUtil.cs
+++ b/src/Util/XmlUtil.cs
@@ -1,5 +1,6 @@
 using System.Reflection;
 using System.Xml.Serialization;
+using System.Text;
 
 namespace sodoff.Util;
 public class XmlUtil {
@@ -9,9 +10,13 @@ public class XmlUtil {
             return (T)serializer.Deserialize(reader);
     }
 
+    private class Utf8StringWriter : StringWriter {
+        public override Encoding Encoding => Encoding.UTF8;
+    }
+
     public static string SerializeXml<T>(T xmlObject) {
         var serializer = new XmlSerializer(typeof(T));
-        using (var writer = new StringWriter()) {
+        using (var writer = new Utf8StringWriter()) {
             serializer.Serialize(writer, xmlObject);
             return writer.ToString();
         }