diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index d3216d8..757cf5a 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -31,6 +31,7 @@ jobs:
         run: |
           cp README.md content
           jupyter lite build --contents content --output-dir dist
+
       - name: Upload dist
         uses: actions/upload-pages-artifact@v3
         with:
diff --git a/content/notebooks/Intro.ipynb b/content/notebooks/Intro.ipynb
index a1279de..87361ba 100755
--- a/content/notebooks/Intro.ipynb
+++ b/content/notebooks/Intro.ipynb
@@ -97,7 +97,7 @@
   ],
   "metadata": {
     "kernelspec": {
-      "display_name": "Pyolite",
+      "display_name": "Python (Pyodide)",
       "language": "python",
       "name": "python"
     },
diff --git a/content/notebooks/Lorenz.ipynb b/content/notebooks/Lorenz.ipynb
index c9d21dc..878e0e6 100644
--- a/content/notebooks/Lorenz.ipynb
+++ b/content/notebooks/Lorenz.ipynb
@@ -14,15 +14,6 @@
         "Before we start, we import some preliminary libraries."
       ]
     },
-    {
-      "cell_type": "code",
-      "execution_count": null,
-      "metadata": {},
-      "outputs": [],
-      "source": [
-        "%pip install -q ipywidgets"
-      ]
-    },
     {
       "cell_type": "code",
       "execution_count": null,
@@ -35,7 +26,7 @@
         "from matplotlib import pyplot as plt\n",
         "from scipy import integrate\n",
         "\n",
-        "from ipywidgets import interactive, fixed"
+        "from ipywidgets import interactive"
       ]
     },
     {
@@ -67,7 +58,7 @@
         "    ax.set_xlim((-25, 25))\n",
         "    ax.set_ylim((-35, 35))\n",
         "    ax.set_zlim((5, 55))\n",
-        "    \n",
+        "\n",
         "    def lorenz_deriv(x_y_z, t0, sigma=sigma, beta=beta, rho=rho):\n",
         "        \"\"\"Compute the time-derivative of a Lorenz system.\"\"\"\n",
         "        x, y, z = x_y_z\n",
@@ -81,7 +72,7 @@
         "    t = np.linspace(0, max_time, int(250*max_time))\n",
         "    x_t = np.asarray([integrate.odeint(lorenz_deriv, x0i, t)\n",
         "                      for x0i in x0])\n",
-        "    \n",
+        "\n",
         "    # choose a different color for each trajectory\n",
         "    colors = plt.cm.viridis(np.linspace(0, 1, N))\n",
         "\n",
@@ -236,9 +227,9 @@
   ],
   "metadata": {
     "kernelspec": {
-      "display_name": "Pyolite",
+      "display_name": "Python (XPython)",
       "language": "python",
-      "name": "python"
+      "name": "xpython"
     },
     "language_info": {
       "codemirror_mode": {
diff --git a/environment-python.yml b/environment-python.yml
new file mode 100644
index 0000000..9d60e76
--- /dev/null
+++ b/environment-python.yml
@@ -0,0 +1,12 @@
+name: xeus-python-kernel
+channels:
+  - https://repo.prefix.dev/emscripten-forge-dev
+  - https://repo.prefix.dev/conda-forge
+dependencies:
+  - xeus-python
+  - numpy
+  - matplotlib
+  - pillow
+  - ipywidgets>=8.1.6
+  - ipyleaflet
+  - scipy
diff --git a/environment.yml b/environment-r.yml
similarity index 100%
rename from environment.yml
rename to environment-r.yml
diff --git a/jupyter_lite_config.json b/jupyter_lite_config.json
new file mode 100644
index 0000000..05367f8
--- /dev/null
+++ b/jupyter_lite_config.json
@@ -0,0 +1,8 @@
+{
+  "XeusAddon": {
+    "environment_file": [
+      "environment-python.yml",
+      "environment-r.yml"
+    ]
+  }
+}