diff --git a/README.md b/README.md
index d7f9d07..48ada36 100644
--- a/README.md
+++ b/README.md
@@ -7,9 +7,9 @@ This instance builds on the `ml-base64` VM (which already provides all
 the needed software packages, on an Ubuntu 22.04 box). On top of that, it
 configures and launches a Jupyter Notebook process, exported as an HTTP service
 to a local port. It allows creating notebooks with two different kernels:
-  * Python 3.10 (plain Python, with additional libraries such as NumPy, SciPy,
+  * Python 3.10 (Python, with installed additional libraries such as NumPy, SciPy,
     Pandas, Matplotlib, Scikit-learn, etc), 
-  * R
+  * R (IRkernel)
 
 The repository also contains a number of small example notebooks.
 
@@ -17,7 +17,6 @@ The contents of the VM are:
 * Python 3.10
 * A virtualenv for Python 3.10 with a scientific Python stack (scipy, numpy, matplotplib, pandas, statmodels, scikit-learn, gensim, xgboost, networkx, seaborn, pylucene and a few others) plus IPython 8 + Jupyter notebook
 * R 4.3 with a few packages installed (rmarkdown, magrittr, dplyr, tidyr, data.table, ggplot2, caret, plus their dependencies).
-* A few small notebook extensions
 
 
 ## Installation
diff --git a/Vagrantfile b/Vagrantfile
index 3dbda0d..943f32d 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -5,7 +5,7 @@
 # **************************************************************************
 
 # --------------------------------------------------------------------------
-# Variables defining the configuration of notebook 
+# Variables defining the configuration of the notebook environment
 # Modify as needed
 
 # RAM memory used for the VM, in MB
@@ -60,10 +60,10 @@ Vagrant.configure(2) do |config|
 
     # The base box we are using. As fetched from ATLAS
     vgrml.vm.box = "paulovn/ml-base64"
-    vgrml.vm.box_version = "= 3.3.0"
+    vgrml.vm.box_version = "= 3.3.1"
 
     # Alternative place: box elsewhere
-    #vgrml.vm.box_url = "http://tiny.cc/ml-base64-330-box"
+    #vgrml.vm.box_url = "http://tiny.cc/ml-base64-331-box"
     # Alternative place: local box
     #vgrml.vm.box_url = "file:///almacen/VM/Export/VagrantBox/ml-base64-LOCAL.json"
 
diff --git a/vmfiles/IPNB/Examples/c Pandas/01 Pandas dataframe.ipynb b/vmfiles/IPNB/Examples/c Pandas/01 Pandas dataframe.ipynb
index 765b33a..14f97e9 100644
--- a/vmfiles/IPNB/Examples/c Pandas/01 Pandas dataframe.ipynb	
+++ b/vmfiles/IPNB/Examples/c Pandas/01 Pandas dataframe.ipynb	
@@ -17,8 +17,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from __future__ import print_function \n",
-    "\n",
     "# Import Pandas & NumPy\n",
     "import pandas as pd\n",
     "import numpy as np"
@@ -404,7 +402,7 @@
    "outputs": [],
    "source": [
     "# Now append this set of rows to the original one\n",
-    "df = df.append(df2, sort=False)\n",
+    "df = pd.concat([df, df2], sort=False)\n",
     "df"
    ]
   },
@@ -485,7 +483,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -499,9 +497,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.6"
+   "version": "3.10.12"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 1
+ "nbformat_minor": 4
 }
diff --git a/vmfiles/IPNB/Examples/e R/01 R basics.ipynb b/vmfiles/IPNB/Examples/e R/01 R basics.ipynb
index 269ae7a..327db29 100644
--- a/vmfiles/IPNB/Examples/e R/01 R basics.ipynb	
+++ b/vmfiles/IPNB/Examples/e R/01 R basics.ipynb	
@@ -5,13 +5,17 @@
    "metadata": {},
    "source": [
     "# Simple tests for an R kernel\n",
-    "This shows basic R manipulation. No access to Spark yet."
+    "<!-- version: 1.2, 2023 -->\n",
+    "This shows basic R manipulation. No access to Spark."
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {
-    "collapsed": true
+    "collapsed": true,
+    "jupyter": {
+     "outputs_hidden": true
+    }
    },
    "source": [
     "## Data manipulation"
@@ -100,7 +104,7 @@
     "library('ggplot2')\n",
     "\n",
     "# A density plot\n",
-    "qplot( dvalue1, data=exdf, geom=\"density\" )"
+    "ggplot(data=exdf, aes(x=dvalue1)) + geom_density()"
    ]
   },
   {
@@ -110,10 +114,10 @@
    "outputs": [],
    "source": [
     "# Change default plot size (values in inches)\n",
-    "options(repr.plot.width = 10, repr.plot.height = 5)\n",
+    "options(repr.plot.width = 12, repr.plot.height = 8)\n",
     "\n",
     "# A scatterplot, discriminating by the factor in the 'vtype' column\n",
-    "qplot( dvalue1, dvalue2, color=vtype, data=exdf )"
+    "ggplot(data=exdf, aes(x=dvalue1, y=dvalue2, color=vtype)) + geom_point()"
    ]
   },
   {
@@ -156,9 +160,9 @@
    "mimetype": "text/x-r-source",
    "name": "R",
    "pygments_lexer": "r",
-   "version": "3.6.2"
+   "version": "4.3.1"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 1
+ "nbformat_minor": 4
 }
diff --git a/vmfiles/IPNB/Examples/g Misc/10 ipywidgets.ipynb b/vmfiles/IPNB/Examples/g Misc/10 ipywidgets.ipynb
index 4b6a387..6388824 100644
--- a/vmfiles/IPNB/Examples/g Misc/10 ipywidgets.ipynb	
+++ b/vmfiles/IPNB/Examples/g Misc/10 ipywidgets.ipynb	
@@ -5,6 +5,7 @@
    "metadata": {},
    "source": [
     "# Ipywidgets\n",
+    "<!-- version: 1.1, 2023 -->\n",
     "\n",
     "[ipywidgets](https://ipywidgets.readthedocs.io/en/stable/) is a Python package providing interactive widgets for Jupyter notebooks.\n",
     "* [ipywidgets installation](https://github.com/jupyter-widgets/ipywidgets/blob/master/README.md#install)\n",
@@ -17,7 +18,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from __future__ import print_function\n",
     "from ipywidgets import widgets"
    ]
   },
@@ -27,7 +27,7 @@
    "source": [
     "## Text example\n",
     "\n",
-    "This example shows a text box. The widget handler just receives the text and prints it out."
+    "This example shows a text box. The widget handler just receives the text and fills another widget (a text label) with it."
    ]
   },
   {
@@ -38,18 +38,25 @@
    "source": [
     "from IPython.display import display\n",
     "\n",
-    "def handle_submit(sender):\n",
-    "    print(\"Submitted:\", text.value)\n",
-    "    \n",
+    "lbl = widgets.Label()\n",
     "text = widgets.Text()\n",
-    "display(text)\n",
-    "text.on_submit(handle_submit)"
+    "\n",
+    "def handle_submit(sender):\n",
+    "    lbl.value = f\" The text is: {text.value}\"\n",
+    "\n",
+    "display(widgets.HBox([text, lbl]))\n",
+    "\n",
+    "text.continuous_update = False\n",
+    "text.observe(handle_submit)"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {
-    "collapsed": true
+    "collapsed": true,
+    "jupyter": {
+     "outputs_hidden": true
+    }
    },
    "source": [
     "## Interact\n",
@@ -114,7 +121,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Boxes"
+    "## Layout\n",
+    "\n",
+    "Build a more complex layout by adding together widgets vertically and/or horizontally."
    ]
   },
   {
@@ -154,7 +163,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -168,9 +177,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.7"
+   "version": "3.10.12"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }