diff --git a/antora-playbook.yml b/antora-playbook.yml
index 633cacb4..5d9de5e2 100644
--- a/antora-playbook.yml
+++ b/antora-playbook.yml
@@ -26,13 +26,14 @@ asciidoc:
   extensions:
     - '@asciidoctor/tabs'
     - '@springio/asciidoctor-extensions'
+    - '@springio/asciidoctor-extensions/javadoc-extension'
 urls:
   latest_version_segment_strategy: redirect:to
   latest_version_segment: ''
   redirect_facility: httpd
 ui:
   bundle:
-    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.4.15/ui-bundle.zip
+    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.4.17/ui-bundle.zip
     snapshot: true
 runtime:
   log: