diff --git a/Gemfile.lock b/Gemfile.lock
index 1778846..ffdfc7c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     webpack-rails (0.9.9)
-      rails (>= 3.2.0)
+      railties (>= 3.2.0)
 
 GEM
   remote: https://rubygems.org/
@@ -140,6 +140,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  rails (>= 3.2.0)
   rake
   rspec
   rubocop
diff --git a/webpack-rails.gemspec b/webpack-rails.gemspec
index 72d2267..e7a00a1 100644
--- a/webpack-rails.gemspec
+++ b/webpack-rails.gemspec
@@ -17,6 +17,7 @@ Gem::Specification.new do |s|
   s.files = Dir["{app,config,db,lib,example}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
   s.test_files = Dir["test/**/*"]
 
-  s.add_dependency "rails", ">= 3.2.0"
+  s.add_dependency "railties", ">= 3.2.0"
+  s.add_development_dependency "rails", ">= 3.2.0"
   s.required_ruby_version = '>= 2.0.0'
 end