diff --git a/ember-cli-rails.gemspec b/ember-cli-rails.gemspec
index ae6c6816..4c81e5e7 100644
--- a/ember-cli-rails.gemspec
+++ b/ember-cli-rails.gemspec
@@ -17,6 +17,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency "ember-cli-rails-assets", ">= 0.6.2", "< 1.0"
   spec.add_dependency "railties", ">= 4.2"
+  spec.add_dependency "rack", ">= 2.1", "< 4.0"
   spec.add_dependency "terrapin", "~> 0.6.0"
   spec.add_dependency "html_page", "~> 0.1.0"
 
diff --git a/lib/ember_cli/deploy/file.rb b/lib/ember_cli/deploy/file.rb
index c4d055bb..04fc41ee 100644
--- a/lib/ember_cli/deploy/file.rb
+++ b/lib/ember_cli/deploy/file.rb
@@ -13,7 +13,7 @@ def mountable?
       end
 
       def to_rack
-        Rack::File.new(app.dist_path.to_s, rack_headers)
+        Rack::Files.new(app.dist_path.to_s, rack_headers)
       end
 
       def index_html
diff --git a/spec/lib/ember_cli/deploy/file_spec.rb b/spec/lib/ember_cli/deploy/file_spec.rb
index b15ffa51..27f63cfb 100644
--- a/spec/lib/ember_cli/deploy/file_spec.rb
+++ b/spec/lib/ember_cli/deploy/file_spec.rb
@@ -33,7 +33,7 @@
   end
 
   describe "#to_rack" do
-    it "creates a Rack::File instance" do
+    it "creates a Rack::Files instance" do
       deploy = EmberCli::Deploy::File.new(build_app)
 
       rack_app = deploy.to_rack