diff --git a/book/_config.yml b/book/_config.yml
index 2c6585c..82c2340 100644
--- a/book/_config.yml
+++ b/book/_config.yml
@@ -17,9 +17,9 @@ sphinx:
   - teachbooks_favourites
   - teachbooks_sphinx_grasple
   - sphinx_apa_references
-  - sphinx_github_alerts
-  - sphinx_metadata_figure
+  - sphinx_gated_directives
   config:
+    language: en
     html_js_files:
     - https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.4/require.min.js
     thebe_config:
diff --git a/book/_toc.yml b/book/_toc.yml
index 4fc09d5..6441842 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -89,6 +89,7 @@ parts:
       - external: https://github.com/TeachBooks/Sphinx-ref-graph/blob/manual/README.md
       - external: https://github.com/TeachBooks/Sphinx-GitHub-Alerts/blob/main/README.md
       - external: https://github.com/TeachBooks/Sphinx-Metadata-Figure/blob/main/MANUAL.ipynb # BUMP
+      - external: https://github.com/TeachBooks/Sphinx-Gated-Directives/blob/main/MANUAL.md
     - file: features/visuals.md
       sections:
       - external: https://github.com/TeachBooks/Sphinx-Accessibility/blob/manual/README.md
diff --git a/book/images/nothing.svg b/book/images/nothing.svg
new file mode 100644
index 0000000..2c4a47c
--- /dev/null
+++ b/book/images/nothing.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1" height="1"></svg>
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 3b6ef5b..a244d27 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,9 @@
-teachbooks == 0.2.3
+# teachbooks == 0.2.3
+git+https://github.com/TeachBooks/TeachBooks@issue-127
 sphinx-inline-tabs
 
 git+https://github.com/TeachBooks/TeachBooks-Favourites
+sphinx-gated-directives
 
 teachbooks-sphinx-grasple