diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 6a0043d..8f50956 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -20,13 +20,20 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
-      - name: Install Conda environment from environment.yml
-        uses: mamba-org/provision-with-micromamba@v12
+
+      - name: Install mamba
+        uses: mamba-org/setup-micromamba@v1
+        with:
+          micromamba-version: '1.5.1-0'
+          environment-file: build-environment.yml
+          cache-environment: true
+
       - name: Build the JupyterLite site
         shell: bash -l {0}
         run: |
           cp README.md content
           jupyter lite build --contents content --output-dir dist
+
       - name: Upload dist
         uses: actions/upload-pages-artifact@v1
         with:
diff --git a/.readthedocs.yml b/.readthedocs.yml
index 603fbe5..02f2629 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -6,7 +6,7 @@ build:
     python: "mambaforge-4.10"
 
 conda:
-  environment: environment.yml
+  environment: build-environment.yml
 
 sphinx:
    configuration: conf.py
diff --git a/build-environment.yml b/build-environment.yml
new file mode 100644
index 0000000..f3668ee
--- /dev/null
+++ b/build-environment.yml
@@ -0,0 +1,27 @@
+name: try-jupyter-build
+channels:
+- conda-forge
+dependencies:
+- python=3.10
+- mamba
+- pydata-sphinx-theme
+- myst-parser
+- bqplot
+- ipycanvas >=0.9.1
+- ipyleaflet
+- ipympl>=0.8.2
+- ipywidgets>=8.1.1,<9
+- jupyterlab>=3.5.2,<4
+- jupyterlab-language-pack-fr-FR
+- jupyterlab-language-pack-zh-CN
+- jupyterlab-fasta>=3,<4
+- jupyterlab-geojson>=3,<4
+- jupyterlab-tour
+- jupyterlab-night
+- jupyterlite-core=0.1.2
+- jupyterlite-xeus-python=0.9.4
+- jupyterlite-sphinx>=0.9.1,<0.10
+- plotly>=5,<6
+- pip:
+  - jupyterlite-xeus-sqlite==0.2.1
+  - jupyterlab-open-url-parameter
diff --git a/content/notebooks/Intro.ipynb b/content/notebooks/Intro.ipynb
index a175ef9..c76462d 100755
--- a/content/notebooks/Intro.ipynb
+++ b/content/notebooks/Intro.ipynb
@@ -1,7 +1,7 @@
 {
   "metadata": {
     "kernelspec": {
-      "display_name": "Pyolite",
+      "display_name": "Python (XPython)",
       "language": "python",
       "name": "python"
     },
diff --git a/content/notebooks/Lorenz.ipynb b/content/notebooks/Lorenz.ipynb
index c9d21dc..790bc20 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,
@@ -236,7 +227,7 @@
   ],
   "metadata": {
     "kernelspec": {
-      "display_name": "Pyolite",
+      "display_name": "Python (XPython)",
       "language": "python",
       "name": "python"
     },
diff --git a/environment.yml b/environment.yml
index c93f6c0..b4602ef 100644
--- a/environment.yml
+++ b/environment.yml
@@ -1,27 +1,10 @@
 name: try-jupyter
 channels:
-- conda-forge
+  - https://repo.mamba.pm/emscripten-forge
+  - conda-forge
 dependencies:
-- python=3.10
-- mamba
-- pydata-sphinx-theme
-- myst-parser
-- bqplot
-- ipycanvas >=0.9.1
-- ipyleaflet
-- ipympl>=0.8.2
-- ipywidgets>=8,<9
-- jupyterlab>=3.5.2,<4
-- jupyterlab-language-pack-fr-FR
-- jupyterlab-language-pack-zh-CN
-- jupyterlab-fasta>=3,<4
-- jupyterlab-geojson>=3,<4
-- jupyterlab-tour
-- jupyterlab-night
-- jupyterlite-core=0.1.2
-- jupyterlite-pyodide-kernel=0.1.1
-- jupyterlite-sphinx>=0.9.1,<0.10
-- plotly>=5,<6
-- pip:
-  - jupyterlite-xeus-sqlite==0.2.1
-  - jupyterlab-open-url-parameter
+  - ipywidgets >=8.1.1,<9
+  - matplotlib
+  - numpy >=1.17.3,<1.25 # for scipy
+  - scipy=1.8
+
diff --git a/jupyter-lite.json b/jupyter-lite.json
index 8eaeedc..7f900eb 100644
--- a/jupyter-lite.json
+++ b/jupyter-lite.json
@@ -2,6 +2,7 @@
   "jupyter-lite-schema-version": 0,
   "jupyter-config-data": {
     "appName": "Try Jupyter!",
+    "defaultKernelName": "python",
     "disabledExtensions": [
       "@jupyterlab/server-proxy",
       "jupyterlab-server-proxy",