diff --git a/Gemfile b/Gemfile
index 2266ada..d278d37 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,6 +7,7 @@ gem "riak-client", :github => "5apps/riak-ruby-client", :branch => "invalid_uri_
 gem "fog"
 gem "rest-client"
 gem "redis"
+gem "mime-types", "~> 2.6.1", require: 'mime/types/columnar'
 
 group :test do
   gem 'rake'
diff --git a/Gemfile.lock b/Gemfile.lock
index e5ea118..9049590 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -102,6 +102,7 @@ DEPENDENCIES
   activesupport (~> 3.2)
   fog
   m
+  mime-types (~> 2.6.1)
   purdytest
   rainbows
   rake