diff --git a/dev-ruby/digest/digest-3.2.1.ebuild b/dev-ruby/digest/digest-3.2.1.ebuild
index 38a746dff4b2d..a9a5049b655bf 100644
--- a/dev-ruby/digest/digest-3.2.1.ebuild
+++ b/dev-ruby/digest/digest-3.2.1.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=8
 
-USE_RUBY="ruby32 ruby33 ruby34"
+USE_RUBY="ruby32 ruby33 ruby34 ruby40"
 
 RUBY_FAKEGEM_BINWRAP=""
 RUBY_FAKEGEM_EXTENSIONS=(ext/digest/extconf.rb ext/digest/bubblebabble/extconf.rb ext/digest/md5/extconf.rb