diff --git a/tool/update-NEWS-gemlist.rb b/tool/update-NEWS-gemlist.rb
index aa766b8846..6804900df1 100755
--- a/tool/update-NEWS-gemlist.rb
+++ b/tool/update-NEWS-gemlist.rb
@@ -1,4 +1,4 @@
-#!/usr/bin/ruby
+#!/usr/bin/env ruby
 require 'json'
 news = File.read("NEWS.md")
 prev = news[/since the \*+(\d+\.\d+\.\d+)\*+/, 1]