diff --git a/dev-ruby/gruff/gruff-0.7.0.ebuild b/dev-ruby/gruff/gruff-0.7.0.ebuild
index f6eee6617f089..14e5a2b1e10c9 100644
--- a/dev-ruby/gruff/gruff-0.7.0.ebuild
+++ b/dev-ruby/gruff/gruff-0.7.0.ebuild
@@ -1,8 +1,8 @@
-# Copyright 1999-2017 Gentoo Foundation
+# Copyright 1999-2018 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=5
-USE_RUBY="ruby21 ruby22 ruby23"
+USE_RUBY="ruby22 ruby23 ruby24"
 
 RUBY_FAKEGEM_TASK_DOC=""