diff --git a/environment.yml b/environment.yml
index 8e9f8cbbc..179d50756 100644
--- a/environment.yml
+++ b/environment.yml
@@ -7,7 +7,7 @@ dependencies:
   - pip
   - pip:
     - jupyter-book>=1.0.4post1,<2.0
-    - quantecon-book-theme==0.16.0
+    - quantecon-book-theme==0.17.1
     - sphinx-tojupyter==0.6.0
     - sphinxext-rediraffe==0.3.0
     - sphinx-exercise==1.2.1
diff --git a/lectures/_config.yml b/lectures/_config.yml
index 62c3539fb..cce72be01 100644
--- a/lectures/_config.yml
+++ b/lectures/_config.yml
@@ -91,6 +91,7 @@ sphinx:
       keywords: Python, QuantEcon, Quantitative Economics, Economics, Sloan, Alfred P. Sloan Foundation, Tom J. Sargent, John Stachurski
       analytics:
         google_analytics_id: G-J0SMYR4SG3
+      sticky_contents: true
       launch_buttons:
         colab_url                 : https://colab.research.google.com
     intersphinx_mapping: