diff --git a/build.gradle b/build.gradle
index 18e86d19..43f42f9e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -11,7 +11,7 @@ antora {
 		'@antora/atlas-extension': '1.0.0-alpha.1',
 		'@antora/collector-extension': '1.0.0-alpha.3',
 		'@asciidoctor/tabs': '1.0.0-beta.3',
-		'@springio/antora-extensions': '1.11.1',
+		'@springio/antora-extensions': '1.13.1',
 		'@springio/asciidoctor-extensions': '1.0.0-alpha.8',
 		'asciinema-player': '3.7.1'
 	]