diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4dc1a0c8..93297461 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -66,4 +66,4 @@ jobs:
           deploy-message: "Preview Deploy from GitHub Actions"
         env:
           NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
-          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
\ No newline at end of file
+          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
diff --git a/environment.yml b/environment.yml
index 924640a8..20b5dae6 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,7 +6,7 @@ dependencies:
   - anaconda=2020.11
   - pip
   - pip:
-    - jupyter-book==0.10.2
+    - jupyter-book==0.11.1
     - sphinx-multitoc-numbering==0.1.3
     - quantecon-book-theme==0.2.3
     - sphinx-tojupyter==0.1.1
diff --git a/lectures/_toc.yml b/lectures/_toc.yml
index 32014a21..b18d4890 100644
--- a/lectures/_toc.yml
+++ b/lectures/_toc.yml
@@ -1,35 +1,34 @@
-- file: intro
+format: jb-book
+root: intro
+parts:
+- caption: Introduction to Python
   numbered: true
-
-- part: Introduction to Python
   chapters:
-    - file: about_py
-    - file: getting_started
-    - file: python_by_example
-    - file: functions
-    - file: python_essentials
-    - file: oop_intro
-    - file: python_oop
-
-- part: The Scientific Libraries
+  - file: about_py
+  - file: getting_started
+  - file: python_by_example
+  - file: functions
+  - file: python_essentials
+  - file: oop_intro
+  - file: python_oop
+- caption: The Scientific Libraries
+  numbered: true
   chapters:
-    - file: need_for_speed
-    - file: numpy
-    - file: matplotlib
-    - file: scipy
-    - file: numba
-    - file: parallelization
-    - file: pandas
-
-- part: Advanced Python Programming
+  - file: need_for_speed
+  - file: numpy
+  - file: matplotlib
+  - file: scipy
+  - file: numba
+  - file: parallelization
+  - file: pandas
+- caption: Advanced Python Programming
+  numbered: true
   chapters:
-    - file: writing_good_code
-    - file: python_advanced_features
-    - file: debugging
-
-# Placeholder for other pages
-
-- part: Other
+  - file: writing_good_code
+  - file: python_advanced_features
+  - file: debugging
+- caption: Other
+  numbered: true
   chapters:
-    - file: troubleshooting
-    - file: status
\ No newline at end of file
+  - file: troubleshooting
+  - file: status
\ No newline at end of file