diff --git a/deployments/data8/config/common.yaml b/deployments/data8/config/common.yaml
index 236540d19..bf0e4f28c 100644
--- a/deployments/data8/config/common.yaml
+++ b/deployments/data8/config/common.yaml
@@ -57,9 +57,12 @@ jupyterhub:
       #    - course::N::enrollment_type::ta
 
   singleuser:
+    extraEnv:
+      # Unset NotebookApp from hub/values. Necessary for recent lab versions.
+      JUPYTERHUB_SINGLEUSER_APP: "jupyter_server.serverapp.ServerApp"
     nodeSelector:
       hub.jupyter.org/pool-name: data8-pool
-    defaultUrl: /retro
+    defaultUrl: /tree
     storage:
       type: static
       static: