diff --git a/dev-ruby/session/session-3.1.2.ebuild b/dev-ruby/session/session-3.1.2.ebuild
index e92bb738299d6..f83083cdc1c5b 100644
--- a/dev-ruby/session/session-3.1.2.ebuild
+++ b/dev-ruby/session/session-3.1.2.ebuild
@@ -4,7 +4,7 @@
 
 EAPI=5
 
-USE_RUBY="ruby20"
+USE_RUBY="ruby20 ruby21"
 
 RUBY_FAKEGEM_TASK_TEST=""
 RUBY_FAKEGEM_TASK_DOC=""