diff --git a/Scripts/Format/VRMExporter.cs b/Scripts/Format/VRMExporter.cs
index abdc32d42..7c749ebe6 100644
--- a/Scripts/Format/VRMExporter.cs
+++ b/Scripts/Format/VRMExporter.cs
@@ -16,7 +16,13 @@ namespace VRM
         {
             var gltf = new glTF_VRM();
             gltf.asset.generator = string.Format("UniVRM-{0}.{1}", VRMVersion.MAJOR, VRMVersion.MINOR);
-            using (var exporter = new VRMExporter(gltf))
+            using (var exporter = new VRMExporter(gltf)
+            {
+#if VRM_EXPORTER_USE_SPARSE
+                // experimental
+                UseSparseAccessorForBlendShape=true
+#endif
+            })
             {
                 _Export(gltf, exporter, go);
 
diff --git a/Scripts/Format/VRMImporter.cs b/Scripts/Format/VRMImporter.cs
index 18b8ca90a..cd79f8e14 100644
--- a/Scripts/Format/VRMImporter.cs
+++ b/Scripts/Format/VRMImporter.cs
@@ -78,8 +78,8 @@ namespace VRM
 
         public static CreateMaterialFunc GetMaterialFunc(List<glTF_VRM_Material> materials)
         {
-            var CreateDefault = gltfImporter.CreateMaterialFuncFromShader(Shader.Find("VRM/UnlitTexture"));
-            var CreateZWrite = gltfImporter.CreateMaterialFuncFromShader(Shader.Find("VRM/UnlitTransparentZWrite"));
+            var CreateDefault = gltfImporter.CreateMaterialFuncFromShader(new ShaderStore("VRM/UnlitTexture"));
+            var CreateZWrite = gltfImporter.CreateMaterialFuncFromShader(new ShaderStore("VRM/UnlitTransparentZWrite"));
             CreateMaterialFunc fallback = (ctx, i) =>
             {
                 var vrm = ctx.GLTF as glTF_VRM;
diff --git a/UniGLTF b/UniGLTF
index c8b19d3b8..ea5b240c0 160000
--- a/UniGLTF
+++ b/UniGLTF
@@ -1 +1 @@
-Subproject commit c8b19d3b8332cadff434a58646610abe2618f3c8
+Subproject commit ea5b240c079de93a36acc6ae187a488f6c2b7f01