diff --git a/rack-protection/Gemfile b/rack-protection/Gemfile
index 8e70942a..66d7b035 100644
--- a/rack-protection/Gemfile
+++ b/rack-protection/Gemfile
@@ -1,4 +1,4 @@
-source "http://rubygems.org"
+source "https://rubygems.org"
 # encoding: utf-8
 
 gem 'rake'