diff --git a/Scripts/Format/VRMExporter.cs b/Scripts/Format/VRMExporter.cs
index 5b56fcc61..4dea58798 100644
--- a/Scripts/Format/VRMExporter.cs
+++ b/Scripts/Format/VRMExporter.cs
@@ -108,7 +108,7 @@ namespace VRM
                     gltf.extensions.VRM.meta.title = meta.Title;
                     if (meta.Thumbnail != null)
                     {
-                        gltf.extensions.VRM.meta.texture = gltfExporter.ExportTexture(gltf, gltf.buffers.Count - 1, meta.Thumbnail);
+                        gltf.extensions.VRM.meta.texture = TextureIO.ExportTexture(gltf, gltf.buffers.Count - 1, meta.Thumbnail);
                     }
                     gltf.extensions.VRM.meta.licenseType = meta.LicenseType;
                     gltf.extensions.VRM.meta.otherLicenseUrl = meta.OtherLicenseUrl;
@@ -130,7 +130,7 @@ namespace VRM
                     gltf.extensions.VRM.meta.title = meta.Title;
                     if (meta.Thumbnail != null)
                     {
-                        gltf.extensions.VRM.meta.texture = gltfExporter.ExportTexture(gltf, gltf.buffers.Count - 1, meta.Thumbnail);
+                        gltf.extensions.VRM.meta.texture = TextureIO.ExportTexture(gltf, gltf.buffers.Count - 1, meta.Thumbnail);
                     }
 
                     // ussage pemission
diff --git a/Scripts/Format/VRMImporter.cs b/Scripts/Format/VRMImporter.cs
index 4c87c9170..ca99c23d1 100644
--- a/Scripts/Format/VRMImporter.cs
+++ b/Scripts/Format/VRMImporter.cs
@@ -55,11 +55,11 @@ namespace VRM
             "VRM/MToon",
         };
 
-        public static CreateMaterialFunc GetMaterialFunc(List<glTF_VRM_Material> materials)
+        public static MaterialIO.CreateMaterialFunc GetMaterialFunc(List<glTF_VRM_Material> materials)
         {
-            var CreateDefault = gltfImporter.CreateMaterialFuncFromShader(new ShaderStore("VRM/UnlitTexture"));
-            var CreateZWrite = gltfImporter.CreateMaterialFuncFromShader(new ShaderStore("VRM/UnlitTransparentZWrite"));
-            CreateMaterialFunc fallback = (ctx, i) =>
+            var CreateDefault = MaterialIO.CreateMaterialFuncFromShader(new ShaderStore("VRM/UnlitTexture"));
+            var CreateZWrite = MaterialIO.CreateMaterialFuncFromShader(new ShaderStore("VRM/UnlitTransparentZWrite"));
+            MaterialIO.CreateMaterialFunc fallback = (ctx, i) =>
             {
                 var vrm = ctx.GLTF;
                 if (vrm != null && vrm.materials[i].name.ToLower().Contains("zwrite"))
diff --git a/UniGLTF b/UniGLTF
index 522dbaa13..dfdfbfe21 160000
--- a/UniGLTF
+++ b/UniGLTF
@@ -1 +1 @@
-Subproject commit 522dbaa1399b6df27e47264b14f25f91c8820ba0
+Subproject commit dfdfbfe2156bae29bab301b203d94ad087712fc4