diff --git a/Gemfile b/Gemfile
index 6b23a59..8b6edbb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
-source 'http://rubygems.org'
+source 'https://rubygems.org'
 
 gem 'sinatra', '~> 2.0'
 gem 'jwt', '~> 2.1'