diff --git a/Gemfile b/Gemfile
index 4356f44..9edd33a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,2 +1,3 @@
+source 'https://rubygems.org'
 gem 'twitter', '~> 5.8.0'
 gem 'proxifier', '~> 1.0.3'
--
libgit2 0.21.2