diff --git a/demos/pyvista-terrain-following-mesh/app.py b/demos/pyvista-terrain-following-mesh/app.py
index ebfb79c..7c55ba0 100644
--- a/demos/pyvista-terrain-following-mesh/app.py
+++ b/demos/pyvista-terrain-following-mesh/app.py
@@ -1,9 +1,10 @@
 import dash
+from dash import dcc, html, Input, Output
 import dash_vtk
 import dash_bootstrap_components as dbc
-import dash_html_components as html
-import dash_core_components as dcc
-from dash.dependencies import Input, Output, State
+#import dash_html_components as html
+#import dash_core_components as dcc
+#from dash.dependencies import Input, Output, State
 
 import random
 import json