diff --git a/Dockerfile b/Dockerfile
index 6ba2893..7c10bbb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,15 @@
 ARG LAB_IMAGE=quay.io/jupyter/scipy-notebook:lab-4.0.12
-
+ARG NB_USER="jovyan"
+ARG NB_UID="1000"
+ARG NB_GID="100"
 FROM ${LAB_IMAGE}
 RUN echo "install custom extensions"
-#RUN python3 -m pip install --upgrade pip setuptools wheel
-RUN pip install --extra-index-url https://git.sandbox.iuk.hdm-stuttgart.de/api/packages/grosse/pypi/simple jupyterlab-sandbox-theme
+USER root
+RUN apt-get install --yes --no-install-recommends \
+    git-lfs 
+USER ${NB_UID}
+
+RUN pip install --extra-index-url https://git.sandbox.iuk.hdm-stuttgart.de/api/packages/grosse/pypi/simple jupyterlab-sandbox-theme==0.1.4
 RUN pip install --extra-index-url https://git.sandbox.iuk.hdm-stuttgart.de/api/packages/grosse/pypi/simple jupyterlab-sandbox-announcement==0.1.3
 #RUN pip install --extra-index-url https://git.sandbox.iuk.hdm-stuttgart.de/api/packages/grosse/pypi/simple jupyterlab-data-pool
 #RUN pip install --extra-index-url https://git.sandbox.iuk.hdm-stuttgart.de/api/packages/grosse/pypi/simple jupyterlab-training