diff --git a/doc/local-playbook.yml b/doc/local-playbook.yml
index adbc75aea..3b4775b67 100644
--- a/doc/local-playbook.yml
+++ b/doc/local-playbook.yml
@@ -19,6 +19,8 @@ ui:
 
 antora:
   extensions:
+    - require: '@antora/lunr-extension' # https://gitlab.com/antora/antora-lunr-extension
+      index_latest_only: true
     - require: '@antora/collector-extension'
     - require: '@cppalliance/antora-cpp-tagfiles-extension'
       cpp-tagfiles: