Update requirements.txt

MarkMelotto · web-flow · commit 7a5f3c2da3e0 · 2026-03-03T14:57:39.000+01:00
diff --git a/requirements.txt b/requirements.txt
@@ -8,6 +8,7 @@ teachbooks-sphinx-tippy
 sphinx-iframes
 sphinx-named-colors
 sphinx-dropdown-toggle
+mermaid
 
 # Now list the packages you want to download directly from GitHub
 git+https://github.com/TeachBooks/Sphinx-Thebe
