diff --git a/Scripts/Format/VRMExporter.cs b/Scripts/Format/VRMExporter.cs
index f3698ce02..020d91117 100644
--- a/Scripts/Format/VRMExporter.cs
+++ b/Scripts/Format/VRMExporter.cs
@@ -112,7 +112,7 @@ namespace VRM
                     gltf.extensions.VRM.meta.title = meta.Title;
                     if (meta.Thumbnail != null)
                     {
-                        gltf.extensions.VRM.meta.texture = TextureIO.ExportTexture(gltf, gltf.buffers.Count - 1, meta.Thumbnail, false);
+                        gltf.extensions.VRM.meta.texture = TextureIO.ExportTexture(gltf, gltf.buffers.Count - 1, meta.Thumbnail, glTFTextureTypes.Unknown);
                     }
                     gltf.extensions.VRM.meta.licenseType = meta.LicenseType;
                     gltf.extensions.VRM.meta.otherLicenseUrl = meta.OtherLicenseUrl;
@@ -134,7 +134,7 @@ namespace VRM
                     gltf.extensions.VRM.meta.title = meta.Title;
                     if (meta.Thumbnail != null)
                     {
-                        gltf.extensions.VRM.meta.texture = TextureIO.ExportTexture(gltf, gltf.buffers.Count - 1, meta.Thumbnail, false);
+                        gltf.extensions.VRM.meta.texture = TextureIO.ExportTexture(gltf, gltf.buffers.Count - 1, meta.Thumbnail, glTFTextureTypes.Unknown);
                     }
 
                     // ussage pemission
diff --git a/UniGLTF b/UniGLTF
index 60d9b4802..2d708472e 160000
--- a/UniGLTF
+++ b/UniGLTF
@@ -1 +1 @@
-Subproject commit 60d9b4802a949fb82e776e960fb38803d2a98da7
+Subproject commit 2d708472ef2c9bc04a268b453be6a6197e026076