diff --git a/.woodpecker.yml b/.woodpecker.yml
index c4e3fda..1eaf723 100644
--- a/.woodpecker.yml
+++ b/.woodpecker.yml
@@ -7,7 +7,7 @@ steps:
       registry: git.sandbox.iuk.hdm-stuttgart.de
       repo: grosse/jupyterlab-datascience
       cache: false
-      tag: 4.0.12
+      tag: 4.0.12b
       context: Dockerfile
       username:
         from_secret: docker_username
diff --git a/Dockerfile b/Dockerfile
index e90336f..5d7741a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,16 +4,15 @@ ARG NB_UID="1000"
 ARG NB_GID="100"
 FROM ${LAB_IMAGE}
 # kaniko issue https://github.com/GoogleContainerTools/kaniko/issues/1087
-#SHELL ["/bin/bash", "-o", "pipefail", "-c"]
-#USER root
-#RUN apt-get update --yes 
-#USER ${NB_UID}
-#RUN echo "install custom extensions "
-#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
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+USER root
+RUN apt-get update --yes 
+USER ${NB_UID}
+RUN echo "install custom extensions "
+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
 #RUN pip install --extra-index-url https://git.sandbox.iuk.hdm-stuttgart.de/api/packages/grosse/pypi/simple jupyterlab-synthetic-data
-RUN pip install ipywebrtc==0.6.0 
-#opencv-python-headless==4.9.0.80 voila==0.5.5
+RUN pip install ipywebrtc==0.6.0 opencv-python-headless==4.9.0.80 voila==0.5.5
 RUN jupyter labextension disable "@jupyterlab/apputils-extension:announcements"
\ No newline at end of file