diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 957e1d9..0ac7af7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
           auto-update-conda: true
           auto-activate-base: true
           miniconda-version: 'latest'
-          python-version: "3.12"
+          python-version: "3.13"
           environment-file: environment.yml
           activate-environment: quantecon
       - name: Install latex dependencies
diff --git a/environment.yml b/environment.yml
index b41712b..d138535 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,12 +2,12 @@ name: quantecon
 channels:
   - default
 dependencies:
-  - python=3.12
-  - anaconda=2024.10
+  - python=3.13
+  - anaconda=2025.06
   - pip
   - pip:
     - jupyter-book==1.0.3
-    - quantecon-book-theme==0.8.2
+    - quantecon-book-theme==0.9.0
     - sphinx-tojupyter==0.3.0
     - sphinxext-rediraffe==0.2.7
     - sphinx-reredirects==0.1.4
diff --git a/lectures/_config.yml b/lectures/_config.yml
index 4c3c0ff..02a385d 100644
--- a/lectures/_config.yml
+++ b/lectures/_config.yml
@@ -46,6 +46,7 @@ sphinx:
       og_logo_url: https://assets.quantecon.org/img/qe-og-logo.png
       description: This website presents a set of lectures on python programming for economics, designed and written by Thomas J. Sargent and John Stachurski.
       keywords: Python, QuantEcon, Quantitative Economics, Economics, Sloan, Alfred P. Sloan Foundation, Tom J. Sargent, John Stachurski
+      enable_rtl: True
       analytics:
         google_analytics_id: G-X7DH1M2DPY
       launch_buttons: