diff --git a/book.json b/book.json
index e80fbe268..09e1bfd94 100644
--- a/book.json
+++ b/book.json
@@ -6,7 +6,6 @@
       "edit-link",
       "forkmegithub",
       "hints",
-      "numbered-headings",
       "page-toc",
       "terminal",
       "toolbar"