diff --git a/package.json b/package.json
index 557d9f174..eb77fd97d 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
     "@antora/collector-extension": "1.0.0-alpha.3",
     "@asciidoctor/tabs": "1.0.0-beta.6",
     "@springio/antora-extensions": "1.11.1",
-    "@springio/asciidoctor-extensions": "1.0.0-alpha.10",
+    "@springio/asciidoctor-extensions": "1.0.0-alpha.13",
     "asciidoctor-kroki": "0.18.1"
   }
 }