diff --git a/repo2docker/detectors.py b/repo2docker/detectors.py
index 995fa436..dbbe51fb 100644
--- a/repo2docker/detectors.py
+++ b/repo2docker/detectors.py
@@ -510,10 +510,10 @@ class PythonBuildPack(BuildPack):
             "${NB_USER}",
             r"""
             pip install --no-cache-dir \
-                notebook==5.0.0 \
+                notebook==5.2.0 \
                 jupyterhub==${JUPYTERHUB_VERSION} \
                 ipywidgets==6.0.0 \
-                jupyterlab==0.27 && \
+                jupyterlab==0.28 && \
             jupyter nbextension enable --py widgetsnbextension --sys-prefix && \
             jupyter serverextension enable --py jupyterlab --sys-prefix
             """
diff --git a/repo2docker/files/conda/environment.yml b/repo2docker/files/conda/environment.yml
index 76c12272..93a73600 100644
--- a/repo2docker/files/conda/environment.yml
+++ b/repo2docker/files/conda/environment.yml
@@ -1,6 +1,6 @@
 dependencies:
   - python==3.6.1
-  - notebook==5.0.0
+  - notebook==5.2.0
   - ipython==6.0.0
   - ipykernel==4.6.0
   - ipywidgets==6.0.0