diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index c81d0cf62143..c5a9e97054fa 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -66,6 +66,10 @@ xmlunit-assertj = { module = "org.xmlunit:xmlunit-assertj3", version.ref = "xmlu
 xmlunit-placeholders = { module = "org.xmlunit:xmlunit-placeholders", version.ref = "xmlunit" }
 testingAnnotations = { module = "com.gradle:gradle-enterprise-testing-annotations", version = "1.1.1" }
 
+# These are only declared here so Dependabot knows when to update the referenced versions
+asciidoctorj-diagram = { module = "org.asciidoctor:asciidoctorj-diagram", version.ref = "asciidoctorj-diagram" }
+asciidoctorj-pdf = { module = "org.asciidoctor:asciidoctorj-pdf", version.ref = "asciidoctorj-pdf" }
+
 [bundles]
 ant = ["ant", "ant-junit", "ant-junitlauncher"]
 log4j = ["log4j-core", "log4j-jul"]