diff --git a/Procfile b/Procfile
index ae83197..e19ef67 100644
--- a/Procfile
+++ b/Procfile
@@ -1 +1 @@
-web: voila --Voila.ip=0.0.0.0 --template=osscar --VoilaConfiguration.enable_nbextensions=True notebook/ --port=$PORT --no-browser --MappingKernelManager.cull_interval=60 --MappingKernelManager.cull_idle_timeout=120 --MappingKernelManager.cull_busy=True 
+web: voila --Voila.ip=0.0.0.0 --classic-tree  --template=osscar --VoilaConfiguration.enable_nbextensions=True notebook/ --port=$PORT --no-browser --MappingKernelManager.cull_interval=60 --MappingKernelManager.cull_idle_timeout=120 --MappingKernelManager.cull_busy=True