diff --git a/Gemfile b/Gemfile
index 5d475d0..3cf1e74 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,6 +4,7 @@ gem "sqlite3",                          :platforms => :ruby
 gem 'rubysl',                           :platforms => :rbx
 gem "jruby-openssl",                    :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
+gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
 gem "rails", "~>4.2"
 gem 'mongoid', '~>4.0' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
 gem 'sequel'
diff --git a/gemfiles/rails_4.0.gemfile b/gemfiles/rails_4.0.gemfile
index 7dace9d..c5c87eb 100644
--- a/gemfiles/rails_4.0.gemfile
+++ b/gemfiles/rails_4.0.gemfile
@@ -5,7 +5,7 @@ gem 'rubysl',                           :platforms => :rbx
 gem 'rubinius-developer_tools',         :platforms => :rbx
 gem "jruby-openssl",                    :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "mime-types", "~> 2"
+gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
 gem "rails", "4.0.13"
 gem 'mongoid', '~>4.0' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
 gem 'sequel'
diff --git a/gemfiles/rails_4.0_mongo_mapper.gemfile b/gemfiles/rails_4.0_mongo_mapper.gemfile
index 86b774d..ab15ea2 100644
--- a/gemfiles/rails_4.0_mongo_mapper.gemfile
+++ b/gemfiles/rails_4.0_mongo_mapper.gemfile
@@ -6,6 +6,7 @@ gem 'rubysl',                           :platforms => :rbx
 gem 'rubinius-developer_tools',         :platforms => :rbx
 gem "jruby-openssl",                    :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
+gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
 gem "rails", "4.0.13"
 gem 'sequel'
 gem 'mongo_mapper', '~>0.13'
diff --git a/gemfiles/rails_4.1.gemfile b/gemfiles/rails_4.1.gemfile
index f407c32..9bd8fcd 100644
--- a/gemfiles/rails_4.1.gemfile
+++ b/gemfiles/rails_4.1.gemfile
@@ -6,6 +6,7 @@ gem 'rubinius-developer_tools',         :platforms => :rbx
 gem "jruby-openssl",                    :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
 gem "rails", "4.1.14"
+gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
 gem 'mongoid', '~>4.0' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
 gem 'sequel'
 gem 'dynamoid', '~> 1',                 :platforms => :ruby
diff --git a/gemfiles/rails_4.1_mongo_mapper.gemfile b/gemfiles/rails_4.1_mongo_mapper.gemfile
index fc6954f..56147bb 100644
--- a/gemfiles/rails_4.1_mongo_mapper.gemfile
+++ b/gemfiles/rails_4.1_mongo_mapper.gemfile
@@ -6,6 +6,7 @@ gem 'rubysl',                           :platforms => :rbx
 gem 'rubinius-developer_tools',         :platforms => :rbx
 gem "jruby-openssl",                    :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
+gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
 gem "rails", "4.1.14"
 gem 'sequel'
 gem 'mongo_mapper', '~> 0.13'
diff --git a/gemfiles/rails_4.2.gemfile b/gemfiles/rails_4.2.gemfile
index 3d3532c..bbdafa7 100644
--- a/gemfiles/rails_4.2.gemfile
+++ b/gemfiles/rails_4.2.gemfile
@@ -5,6 +5,7 @@ gem 'rubysl',                           :platforms => :rbx
 gem 'rubinius-developer_tools',         :platforms => :rbx
 gem "jruby-openssl",                    :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
+gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
 gem "rails", "4.2.5"
 gem 'mongoid', '~>4.0' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
 gem 'sequel'
diff --git a/gemfiles/rails_4.2_mongo_mapper.gemfile b/gemfiles/rails_4.2_mongo_mapper.gemfile
index 604a7ee..62a8550 100644
--- a/gemfiles/rails_4.2_mongo_mapper.gemfile
+++ b/gemfiles/rails_4.2_mongo_mapper.gemfile
@@ -6,6 +6,7 @@ gem 'rubysl',                           :platforms => :rbx
 gem 'rubinius-developer_tools',         :platforms => :rbx
 gem "jruby-openssl",                    :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
+gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
 gem "rails", "4.2.5"
 gem 'sequel'
 gem 'mongo_mapper'
diff --git a/gemfiles/rails_4.2_mongoid_5.gemfile b/gemfiles/rails_4.2_mongoid_5.gemfile
index 249f34d..e17f547 100644
--- a/gemfiles/rails_4.2_mongoid_5.gemfile
+++ b/gemfiles/rails_4.2_mongoid_5.gemfile
@@ -5,6 +5,7 @@ gem 'rubysl',                           :platforms => :rbx
 gem 'rubinius-developer_tools',         :platforms => :rbx
 gem "jruby-openssl",                    :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
+gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
 gem "rails", "4.2.5"
 gem 'mongoid', '~>5.0' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
 gem 'sequel'