diff --git a/Gemfile b/Gemfile
index 9944c0a..39026d3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
 source "https://rubygems.org"
-ruby '2.2.0'
+ruby '2.4.0'
 gem 'sinatra', '1.4.7'
-gem 'encrypted_strings'
\ No newline at end of file
+gem 'encrypted_strings'