diff --git a/conf.py b/conf.py
index 966ee5b5..e0b57234 100644
--- a/conf.py
+++ b/conf.py
@@ -177,6 +177,10 @@
     "vale-styles/*",
     "CODE_OF_CONDUCT.md",
     "CLAUDE.md",
+    # Local virtualenv under the doc root; otherwise Sphinx/Myst scans site-packages.
+    ".venv",
+    "venv",
+    "env",
 ]
 
 # For sitemap generation