diff --git a/Gemfile b/Gemfile
index bdfbb1f..c36fb20 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'http://rubygems.org'
 
-ruby '2.2.0'
+ruby '2.2.3'
 
 gem 'slack-ruby-bot'
 gem 'wolfram'