diff --git a/Assets/VRM/UniGLTF/Editor/Tests/UniGLTFTests.cs b/Assets/VRM/UniGLTF/Editor/Tests/UniGLTFTests.cs
index 067cdb83f..1db2c13fa 100644
--- a/Assets/VRM/UniGLTF/Editor/Tests/UniGLTFTests.cs
+++ b/Assets/VRM/UniGLTF/Editor/Tests/UniGLTFTests.cs
@@ -666,10 +666,7 @@ namespace UniGLTF
 
                 // import new version
                 {
-                    var context = new ImporterContext
-                    {
-                        SerializerType = SerializerTypes.UniJSON
-                    };
+                    var context = new ImporterContext();
                     context.ParseJson(json, new SimpleStorage(new ArraySegment<byte>(new byte[1024 * 1024])));
                     //Debug.LogFormat("{0}", context.Json);
                     context.Load();
diff --git a/Assets/VRM/UniGLTF/Scripts/Format/SerializerTypes.cs b/Assets/VRM/UniGLTF/Scripts/Format/SerializerTypes.cs
index 9dc459c36..fcdee0804 100644
--- a/Assets/VRM/UniGLTF/Scripts/Format/SerializerTypes.cs
+++ b/Assets/VRM/UniGLTF/Scripts/Format/SerializerTypes.cs
@@ -2,8 +2,8 @@
 {
     public enum SerializerTypes
     {
+        Generated, // generated, No AOT Problem
         JsonSerializable, // manual, Obsolete
-        UniJSON, // reflection
-        Generated, // generated, experimental for mobile
+        UniJSON, // reflection, Obsolete
     }
 }
diff --git a/Assets/VRM/UniGLTF/Scripts/Format/glTF.cs b/Assets/VRM/UniGLTF/Scripts/Format/glTF.cs
index f7de69655..b9be6d1b6 100644
--- a/Assets/VRM/UniGLTF/Scripts/Format/glTF.cs
+++ b/Assets/VRM/UniGLTF/Scripts/Format/glTF.cs
@@ -427,10 +427,10 @@ namespace UniGLTF
 
         void Traverse(ListTreeNode<JsonValue> node, JsonFormatter f, Utf8String parentKey)
         {
-            if(node.IsMap())
+            if (node.IsMap())
             {
                 f.BeginMap();
-                foreach(var kv in node.ObjectItems())
+                foreach (var kv in node.ObjectItems())
                 {
                     if (parentKey == s_extensions)
                     {
@@ -444,10 +444,10 @@ namespace UniGLTF
                 }
                 f.EndMap();
             }
-            else if(node.IsArray())
+            else if (node.IsArray())
             {
                 f.BeginList();
-                foreach(var x in node.ArrayItems())
+                foreach (var x in node.ArrayItems())
                 {
                     Traverse(x, f, default(Utf8String));
                 }
@@ -468,11 +468,12 @@ namespace UniGLTF
             return f.ToString();
         }
 
-        public byte[] ToGlbBytes(SerializerTypes serializer = SerializerTypes.UniJSON)
+        public byte[] ToGlbBytes(SerializerTypes serializer = SerializerTypes.Generated)
         {
             string json;
             if (serializer == SerializerTypes.UniJSON)
             {
+                // Obsolete
                 var c = new JsonSchemaValidationContext(this)
                 {
                     EnableDiagnosisForNotRequiredFields = true,
@@ -485,7 +486,7 @@ namespace UniGLTF
                 f.GenSerialize(this);
                 json = f.ToString().ParseAsJson().ToString("  ");
             }
-            else if(serializer == SerializerTypes.JsonSerializable)
+            else if (serializer == SerializerTypes.JsonSerializable)
             {
                 // Obsolete
                 json = ToJson();
diff --git a/Assets/VRM/UniGLTF/Scripts/IO/ImporterContext.cs b/Assets/VRM/UniGLTF/Scripts/IO/ImporterContext.cs
index b1dcafbad..0da87dba6 100644
--- a/Assets/VRM/UniGLTF/Scripts/IO/ImporterContext.cs
+++ b/Assets/VRM/UniGLTF/Scripts/IO/ImporterContext.cs
@@ -271,7 +271,7 @@ namespace UniGLTF
             }
         }
 
-        private SerializerTypes _serializerType = SerializerTypes.UniJSON;
+        private SerializerTypes _serializerType = SerializerTypes.Generated;
         public SerializerTypes SerializerType { get { return _serializerType; } set { _serializerType = value; } }
 
         public virtual void ParseJson(string json, IStorage storage)
@@ -281,6 +281,7 @@ namespace UniGLTF
 
             if (_serializerType == SerializerTypes.UniJSON)
             {
+                // Obsolete
                 Json.ParseAsJson().Deserialize(ref GLTF);
             }
             else if (_serializerType == SerializerTypes.Generated)
diff --git a/Assets/VRM/UniVRM/Editor/Format/VRMEditorExporter.cs b/Assets/VRM/UniVRM/Editor/Format/VRMEditorExporter.cs
index 0e5902c8a..d74dd2cc5 100644
--- a/Assets/VRM/UniVRM/Editor/Format/VRMEditorExporter.cs
+++ b/Assets/VRM/UniVRM/Editor/Format/VRMEditorExporter.cs
@@ -231,7 +231,7 @@ namespace VRM
                 // vrm.extensions.VRM.meta.contactInformation = settings.ContactInformation;
                 // vrm.extensions.VRM.meta.reference = settings.Reference;
 
-                var bytes = vrm.ToGlbBytes(settings.UseExperimentalExporter ? SerializerTypes.Generated : SerializerTypes.UniJSON);
+                var bytes = vrm.ToGlbBytes();
                 File.WriteAllBytes(path, bytes);
                 Debug.LogFormat("Export elapsed {0}", sw.Elapsed);
             }
diff --git a/Assets/VRM/UniVRM/Editor/Format/VRMExportSettings.cs b/Assets/VRM/UniVRM/Editor/Format/VRMExportSettings.cs
index 9c2dc96e5..154443c4a 100644
--- a/Assets/VRM/UniVRM/Editor/Format/VRMExportSettings.cs
+++ b/Assets/VRM/UniVRM/Editor/Format/VRMExportSettings.cs
@@ -18,12 +18,6 @@ namespace VRM
         [Tooltip("Require only first time")]
         public bool PoseFreeze = true;
 
-        /// <summary>
-        /// エクスポート時に新しいJsonSerializerを使う
-        /// </summary>
-        [Tooltip("Use new JSON serializer")]
-        public bool UseExperimentalExporter = false;
-
         /// <summary>
         /// BlendShapeのシリアライズにSparseAccessorを使う
         /// </summary>