diff --git a/dev-ruby/css_parser/css_parser-1.21.1.ebuild b/dev-ruby/css_parser/css_parser-1.21.1.ebuild
index b3b07a113558c..1c7194eec5627 100644
--- a/dev-ruby/css_parser/css_parser-1.21.1.ebuild
+++ b/dev-ruby/css_parser/css_parser-1.21.1.ebuild
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
-USE_RUBY="ruby31 ruby32 ruby33"
+USE_RUBY="ruby31 ruby32 ruby33 ruby34"
 
 RUBY_FAKEGEM_DOC_DIR="doc"
 RUBY_FAKEGEM_EXTRADOC="CHANGELOG.md README.md "