diff --git a/app/application.rb b/app/application.rb
index 0ffa81b..bee989a 100755
--- a/app/application.rb
+++ b/app/application.rb
@@ -1,6 +1,6 @@
-#!/usr/bin/env ruby
+#!/usr/bin/env ruby2.5
 # coding: utf-8
-Encoding.default_internal = "UTF-8"
+Encoding.default_external = "UTF-8"
 require 'kconv'
 require 'cgi'