diff --git a/lib/Foswiki/Plugins/ClassificationPlugin/DEPENDENCIES b/lib/Foswiki/Plugins/ClassificationPlugin/DEPENDENCIES
index 88eb857..e071bea 100644
--- a/lib/Foswiki/Plugins/ClassificationPlugin/DEPENDENCIES
+++ b/lib/Foswiki/Plugins/ClassificationPlugin/DEPENDENCIES
@@ -1,5 +1,5 @@
 Foswiki::Contrib::JSTreeContrib,>=1.03,perl,Required
-Foswiki::Contrib::WikiWorkbenchContrib,>=1.20,perl,Required
+Foswiki::Contrib::WikiWorkbenchContrib,>=1.31,perl,Required
 Foswiki::Plugins::DBCachePlugin,>=4.10,perl,Required
 Foswiki::Plugins::FilterPlugin,>=1.40,perl,Required
 Foswiki::Plugins::FlexFormPlugin,>=2.61,perl,Required