diff --git a/Programming/anaconda/2019.07/conda-env-defs/jupyterhub-4.0.2_lab3_py3.11/jupyterhub-4.0.2_lab3_py3.11.yml b/Programming/anaconda/2019.07/conda-env-defs/jupyterhub-4.0.2_lab3_py3.11/jupyterhub-4.0.2_lab3_py3.11.yml
index 79533cc..f913dff 100644
--- a/Programming/anaconda/2019.07/conda-env-defs/jupyterhub-4.0.2_lab3_py3.11/jupyterhub-4.0.2_lab3_py3.11.yml
+++ b/Programming/anaconda/2019.07/conda-env-defs/jupyterhub-4.0.2_lab3_py3.11/jupyterhub-4.0.2_lab3_py3.11.yml
@@ -8,6 +8,8 @@ dependencies:
   - nb_conda_kernels
   - jupyter_contrib_nbextensions
   - ipywidgets=7.6.3
+# needed for widgets!
+  - ipympl
   - pip
   - jupytext
   - python=3.11.6