diff --git a/build.json b/build.json
index ee04e8f6..bac7ade3 100644
--- a/build.json
+++ b/build.json
@@ -1,7 +1,7 @@
 {
   "variable": {
     "PYTHON_VERSION": {
-      "default": "3.9.13"
+      "default": "3.10.11"
     },
     "PGSQL_VERSION": {
       "default": "15"
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 6da4c94d..d4d4fe31 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -5,3 +5,4 @@ pytest
 pytest-docker
 doit
 dunamai
+pyyaml<=5.3.1
diff --git a/stack/full-stack/Dockerfile b/stack/full-stack/Dockerfile
index 2a39b0ec..82d4e54b 100644
--- a/stack/full-stack/Dockerfile
+++ b/stack/full-stack/Dockerfile
@@ -22,7 +22,7 @@ RUN if [ "$TARGETARCH" = "arm64" ]; then \
 fi
 
 RUN fix-permissions "${CONDA_DIR}"
-RUN fix-permissions "/home/${NB_USER}/.aiida"
+RUN fix-permissions "/home/${NB_USER}"
 
 USER ${NB_USER}
 
diff --git a/stack/lab/Dockerfile b/stack/lab/Dockerfile
index 9b36cc98..0fdeac66 100644
--- a/stack/lab/Dockerfile
+++ b/stack/lab/Dockerfile
@@ -85,7 +85,7 @@ WORKDIR "/home/${NB_USER}"
 
 RUN  mkdir -p /home/${NB_USER}/apps
 
-# When a Jupyter notebook server looses a connection to the frontend,
+# NOTE 1: When a Jupyter notebook server looses a connection to the frontend,
 # it keeps the messages in a buffer. If there is a background thread running
 # and trying to update the frontend, the buffer grows indefinitely,
 # eventually consuming all available RAM.
@@ -95,8 +95,10 @@ RUN  mkdir -p /home/${NB_USER}/apps
 # but that may come with other problems for people with flaky internet connections.
 # Instead, here we configure Jupyter to kill all kernels that have been alive for
 # more than 12 hours. We also close all inactive terminals after 10 minutes.
+# NOTE 2: show_banner=False disables the banner for upgrading to Notebook 7.
 ENV NOTEBOOK_ARGS \
      "--NotebookApp.default_url='/apps/apps/home/start.ipynb'" \
+     "--NotebookApp.show_banner=False" \
      "--ContentsManager.allow_hidden=True" \
      "--MappingKernelManager.buffer_offline_messages=True" \
      "--MappingKernelManager.cull_busy=True" \