diff --git a/Gemfile b/Gemfile
index 48ec038..eace766 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
-ruby '2.2.1'
+ruby '3.1.3'
 
 gem 'sinatra', '~>1.4.4'
 gem 'thin'