diff --git a/dev-ruby/celluloid-io/celluloid-io-0.17.3.ebuild b/dev-ruby/celluloid-io/celluloid-io-0.17.3.ebuild
index 8425b9cf50a6c..5e7f7bb856642 100644
--- a/dev-ruby/celluloid-io/celluloid-io-0.17.3.ebuild
+++ b/dev-ruby/celluloid-io/celluloid-io-0.17.3.ebuild
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=5
-USE_RUBY="ruby21 ruby22"
+USE_RUBY="ruby22 ruby23"
 
 RUBY_FAKEGEM_RECIPE_TEST="rspec3"
 RUBY_FAKEGEM_TASK_DOC=""