diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0916536..bb1deb6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -10,11 +10,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.7
+        python-version: "3.10"
     - name: Install Python dependencies
       run: |
         sudo apt-get install python3-pip
diff --git a/content/Introduction.md b/content/Introduction.md
index ce28cfa..547ac35 100644
--- a/content/Introduction.md
+++ b/content/Introduction.md
@@ -1,5 +1,5 @@
 # Python REU Tutorial
-## Summer 2022
+## Summer 2023
 
 ![xkcd](01-python-basics/python.png)
 
diff --git a/content/_config.yml b/content/_config.yml
index 90e72cb..d0f1560 100644
--- a/content/_config.yml
+++ b/content/_config.yml
@@ -4,7 +4,7 @@
 title: REU Tutorial on Python
 author: <a href="https://zingale.github.io">Michael Zingale</a>
 #logo: logo.png
-copyright: "2021"
+copyright: "2023"
 
 # Force re-execution of notebooks on each build.
 # See https://jupyterbook.org/content/execute.html
@@ -29,13 +29,28 @@ html:
   use_repository_button: true
   extra_footer: |
     <p>
-    &copy; 2021; CC-BY-NC-SA 4.0
+    &copy; 2023; CC-BY-NC-SA 4.0
     <p>
 
 sphinx:
   config:
     html_show_copyright: false
+    nbsphinx_timeout: 300
+    nb_execution_timeout: 300
 
 launch_buttons:
    binderhub_url: "https://mybinder.org"
    colab_url: "https://colab.research.google.com"
+
+parse:
+  extensions:
+    - myst_parser
+    - sphinx_design
+
+  myst_enable_extensions:
+    # don't forget to list any other extensions you want enabled,
+    # including those that are enabled by default!
+    - amsmath
+    - dollarmath
+    - linkify
+    - colon_fence
diff --git a/content/_static/myfile.css b/content/_static/myfile.css
new file mode 100644
index 0000000..aeeec94
--- /dev/null
+++ b/content/_static/myfile.css
@@ -0,0 +1,10 @@
+@import url('https://fonts.googleapis.com/css2?family=Lato:ital,wght@0,100;0,300;0,400;0,700;0,900;1,100;1,300;1,400;1,700;1,900&display=swap');
+@import url('https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500;1,600;1,700&display=swap');
+
+body {
+    font-family: "Open Sans", sans-serif;
+}
+
+.heading-style, h1, h2, h3, h4, h5, h6 {
+    font-family: "Open Sans", sans-serif;
+}