diff --git a/Gemfile b/Gemfile
index 707bb89..8bef609 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,4 @@
+source 'https://rubygems.org'
 gem 'vcr'
 
 group :test do
--
libgit2 0.21.2