diff --git a/build.gradle b/build.gradle
index 43f6573..4a7d5ab 100644
--- a/build.gradle
+++ b/build.gradle
@@ -168,7 +168,7 @@ configurations {
   requireJavadoc
 }
 dependencies {
-  requireJavadoc 'org.plumelib:require-javadoc:1.0.8'
+  requireJavadoc 'org.plumelib:require-javadoc:1.0.9'
 }
 task requireJavadoc(type: JavaExec) {
   group = 'Documentation'