diff --git a/book.json b/book.json
index 07628e3..a97a009 100644
--- a/book.json
+++ b/book.json
@@ -15,11 +15,10 @@
         "-search",
         "splitter",
         "search-pro",
-        "expandable-chapters-small",
         "github-buttons@2.1.0",
         "prism",
         "back-to-top-button",
-        "chapter-fold",
+        "expandable-chapters",
         "pageview-count",
         "flexible-alerts",
         "atoc",