diff --git a/Gemfile b/Gemfile
index 333a9eb..e6219a5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
-source :rubygems
+source 'https://rubygems.org'
 
 gem 'rake'
 gem 'mime-types'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1b21fb3..726af09 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,5 +1,5 @@
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
     bitly (0.9.0)
       httparty (>= 0.7.6)