diff --git a/Assets/UniGLTF/Runtime/UniGLTF/Format/glbTypes.cs b/Assets/UniGLTF/Runtime/UniGLTF/Format/glbTypes.cs
index cb10dd6df..2b8e0bf4a 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/Format/glbTypes.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/Format/glbTypes.cs
@@ -219,6 +219,11 @@ namespace UniGLTF
         }
 
         public static Glb Parse(Byte[] bytes)
+        {
+            return Parse(new ArraySegment<byte>(bytes));
+        }
+
+        public static Glb Parse(ArraySegment<Byte> bytes)
         {
             if (TryParse(bytes, out Glb glb, out Exception ex))
             {
diff --git a/Assets/VRM10/Runtime/Migration.meta b/Assets/VRM10/Runtime/Migration.meta
new file mode 100644
index 000000000..26398a409
--- /dev/null
+++ b/Assets/VRM10/Runtime/Migration.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 475aa606f7fac0648a504be5102a6f16
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM10/Runtime/Migration/Migration.cs b/Assets/VRM10/Runtime/Migration/Migration.cs
new file mode 100644
index 000000000..8f15afb7b
--- /dev/null
+++ b/Assets/VRM10/Runtime/Migration/Migration.cs
@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using UniGLTF.Extensions.VRMC_vrm;
+using UniJSON;
+
+namespace UniVRM10
+{
+    /// <summary>
+    /// Convert vrm0 binary to vrm1 binary. Json processing
+    /// </summary>
+    public static class Migration
+    {
+        static bool TryGet(this UniGLTF.glTFExtensionImport extensions, string key, out ListTreeNode<JsonValue> value)
+        {
+            foreach (var kv in extensions.ObjectItems())
+            {
+                if (kv.Key.GetString() == key)
+                {
+                    value = kv.Value;
+                    return true;
+                }
+            }
+
+            value = default;
+            return false;
+        }
+
+        public static byte[] Migrate(byte[] src)
+        {
+            var glb = UniGLTF.Glb.Parse(src);
+            var json = glb.Json.Bytes.ParseAsJson();
+
+            var gltf = UniGLTF.GltfDeserializer.Deserialize(json);
+            if (!(gltf.extensions is UniGLTF.glTFExtensionImport import))
+            {
+                throw new Exception("not extensions");
+            }
+            if (!import.TryGet("VRM", out ListTreeNode<JsonValue> vrm))
+            {
+                throw new Exception("no vrm");
+            }
+
+            {
+                var vrm1 = new VRMC_vrm();
+                var f = new JsonFormatter();
+                GltfSerializer.Serialize(f, vrm1);
+                gltf.extensions = new UniGLTF.glTFExtensionExport().Add(VRMC_vrm.ExtensionName, f.GetStoreBytes());
+            }
+
+            ArraySegment<byte> vrm1Json = default;
+            {
+                var f = new JsonFormatter();
+                UniGLTF.GltfSerializer.Serialize(f, gltf);
+                vrm1Json = f.GetStoreBytes();
+            }
+
+            return UniGLTF.Glb.Create(vrm1Json, glb.Binary.Bytes).ToBytes();
+        }
+    }
+}
diff --git a/Assets/VRM10/Runtime/Migration/Migration.cs.meta b/Assets/VRM10/Runtime/Migration/Migration.cs.meta
new file mode 100644
index 000000000..09c343804
--- /dev/null
+++ b/Assets/VRM10/Runtime/Migration/Migration.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: ab1292ee15555c249af9108c10133c99
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM10/Tests/MigrationTests.cs b/Assets/VRM10/Tests/MigrationTests.cs
new file mode 100644
index 000000000..fd70d6b45
--- /dev/null
+++ b/Assets/VRM10/Tests/MigrationTests.cs
@@ -0,0 +1,47 @@
+using System.IO;
+using NUnit.Framework;
+using UnityEngine;
+using UniJSON;
+
+namespace UniVRM10
+{
+    public class MigrationTests
+    {
+        static string AliciaPath
+        {
+            get
+            {
+                return Path.GetFullPath(Application.dataPath + "/../Tests/Models/Alicia_vrm-0.51/AliciaSolid_vrm-0.51.vrm")
+                    .Replace("\\", "/");
+            }
+        }
+
+        UniGLTF.Extensions.VRMC_vrm.VRMC_vrm GetVRM(UniGLTF.glTFExtension extensions)
+        {
+            if (extensions is UniGLTF.glTFExtensionImport import)
+            {
+                foreach (var kv in import.ObjectItems())
+                {
+                    if (kv.Key.GetUtf8String() == UniGLTF.Extensions.VRMC_vrm.VRMC_vrm.ExtensionNameUtf8)
+                    {
+                        return UniGLTF.Extensions.VRMC_vrm.GltfDeserializer.Deserialize(kv.Value);
+                    }
+                }
+            }
+
+            return default;
+        }
+
+        [Test]
+        public void Migrate0to1()
+        {
+            var vrm0 = File.ReadAllBytes(AliciaPath);
+            var vrm1 = Migration.Migrate(vrm0);
+            var glb = UniGLTF.Glb.Parse(vrm1);
+            var json = glb.Json.Bytes.ParseAsJson();
+            var gltf = UniGLTF.GltfDeserializer.Deserialize(json);
+            var vrm = GetVRM(gltf.extensions);
+            Assert.NotNull(vrm);
+        }
+    }
+}
diff --git a/Assets/VRM10/Tests/MigrationTests.cs.meta b/Assets/VRM10/Tests/MigrationTests.cs.meta
new file mode 100644
index 000000000..2bfe03e08
--- /dev/null
+++ b/Assets/VRM10/Tests/MigrationTests.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 856d7b1293642ed4dbce5341b397b74e
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: