diff --git a/package.json b/package.json
index 80836ebda..bafa987d1 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,6 @@
     "@antora/collector-extension": "1.0.3",
     "@asciidoctor/tabs": "1.0.0-beta.6",
     "@springio/antora-extensions": "1.14.11",
-    "@springio/asciidoctor-extensions": "1.0.0-alpha.10"
+    "@springio/asciidoctor-extensions": "1.0.0-alpha.18"
   }
 }