diff --git a/Scripts/Editor/VRMTest.cs b/Scripts/Editor/VRMTest.cs
index 595d62b1b..23810459b 100644
--- a/Scripts/Editor/VRMTest.cs
+++ b/Scripts/Editor/VRMTest.cs
@@ -61,7 +61,7 @@ public class VRMTest
                 // import
                 context.ParseJson(gltf.ToJson(), new SimpleStorage());
                 Debug.LogFormat("{0}", context.Json);
-                gltfImporter.Import(context);
+                gltfImporter.Load(context);
 
                 AssertAreEqual(go.transform, context.Root.transform);
             }
diff --git a/Scripts/Format/VRMFormat.cs b/Scripts/Format/VRMFormat.cs
index 811b6dd10..554fbfbc7 100644
--- a/Scripts/Format/VRMFormat.cs
+++ b/Scripts/Format/VRMFormat.cs
@@ -17,7 +17,7 @@ namespace UniGLTF
         }
     }
 
-    public partial class glTF_extensions : JsonSerializableBase
+    public partial class glTF_extensions : ExtensionBase
     {
         public VRM.glTF_VRM_extensions VRM = new VRM.glTF_VRM_extensions();
 
diff --git a/Scripts/Format/VRMImporter.cs b/Scripts/Format/VRMImporter.cs
index afb0286a7..838fa6c6d 100644
--- a/Scripts/Format/VRMImporter.cs
+++ b/Scripts/Format/VRMImporter.cs
@@ -44,7 +44,7 @@ namespace VRM
         {
             context.CreateMaterial = VRMImporter.GetMaterialFunc(glTF_VRM_Material.Parse(context.Json));
 
-            gltfImporter.Import(context);
+            gltfImporter.Load(context);
             if (string.IsNullOrEmpty(context.Path))
             {
                 if (string.IsNullOrEmpty(context.GLTF.extensions.VRM.meta.title))
diff --git a/UniGLTF b/UniGLTF
index c0902e94e..f58f73ae7 160000
--- a/UniGLTF
+++ b/UniGLTF
@@ -1 +1 @@
-Subproject commit c0902e94e4db7029c9a7d1eb505d732b216ebbfa
+Subproject commit f58f73ae752617142be5d9503f9002eb664768a6