diff --git a/v5.rb b/v5.rb
index 2366a2f..ea20901 100644
--- a/v5.rb
+++ b/v5.rb
@@ -1,3 +1,4 @@
+#! /usr/bin/ruby3.0
 require 'sinatra'
 require 'erb'
 
@@ -68,4 +69,4 @@ end
 not_found do
 	status 404
 	erb :oops
-end
\ No newline at end of file
+end