===================================================================
--- ruby/ext/io/console/io-console.gemspec      (revision 54582)
+++ ruby/ext/io/console/io-console.gemspec      (working copy)
@@ -9,7 +9,7 @@
   s.summary = "Console interface"
   s.email = "nobu@ruby-lang.org"
   s.description = "add console capabilities to IO instances."
-  s.required_ruby_version = ">= 2.0.0"
+  s.required_ruby_version = ">= 2.2.0"
   s.homepage = "http://www.ruby-lang.org"
   s.authors = ["Nobu Nakada"]
   s.require_path = %[lib]