diff --git a/api_taster.gemspec b/api_taster.gemspec
index 4114d80..6f5666b 100644
--- a/api_taster.gemspec
+++ b/api_taster.gemspec
@@ -14,7 +14,7 @@ Gem::Specification.new do |s|
   s.files      = `git ls-files`.split($\)
   s.test_files = Dir["spec/**/*"]
 
-  s.add_dependency 'rails', '~> 3.2.0'
+  s.add_dependency 'rails', '~> 4.0.0'
   s.add_dependency 'jquery-rails'
   s.add_dependency 'sass-rails'
   s.add_dependency 'bootstrap-sass', '~> 2.1'
diff --git a/spec/dummy/config/environments/development.rb b/spec/dummy/config/environments/development.rb
index 3b9e645..9121010 100644
--- a/spec/dummy/config/environments/development.rb
+++ b/spec/dummy/config/environments/development.rb
@@ -6,9 +6,6 @@
   # since you don't have to restart the web server when you make code changes.
   config.cache_classes = false
 
-  # Log error messages when you accidentally call methods on nil.
-  config.whiny_nils = true
-
   # Show full error reports and disable caching
   config.consider_all_requests_local       = true
   config.action_controller.perform_caching = false
@@ -34,4 +31,6 @@
 
   # Expands the lines which load the assets
   config.assets.debug = true
+
+  config.eager_load = false
 end
diff --git a/spec/dummy/config/environments/production.rb b/spec/dummy/config/environments/production.rb
index 166953a..91c400f 100644
--- a/spec/dummy/config/environments/production.rb
+++ b/spec/dummy/config/environments/production.rb
@@ -64,4 +64,6 @@
   # Log the query plan for queries taking more than this (works
   # with SQLite, MySQL, and PostgreSQL)
   # config.active_record.auto_explain_threshold_in_seconds = 0.5
+
+  config.eager_load = true
 end
diff --git a/spec/dummy/config/environments/test.rb b/spec/dummy/config/environments/test.rb
index 5eeb1e4..87c5f75 100644
--- a/spec/dummy/config/environments/test.rb
+++ b/spec/dummy/config/environments/test.rb
@@ -11,9 +11,6 @@
   config.serve_static_assets = true
   config.static_cache_control = "public, max-age=3600"
 
-  # Log error messages when you accidentally call methods on nil
-  config.whiny_nils = true
-
   # Show full error reports and disable caching
   config.consider_all_requests_local       = true
   config.action_controller.perform_caching = false
@@ -34,4 +31,6 @@
 
   # Print deprecation notices to the stderr
   config.active_support.deprecation = :stderr
+
+  config.eager_load = false
 end
diff --git a/spec/mapper_spec.rb b/spec/mapper_spec.rb
index 1127ef4..4b6f481 100644
--- a/spec/mapper_spec.rb
+++ b/spec/mapper_spec.rb
@@ -36,7 +36,7 @@ module ApiTaster
     before(:all) do
       Rails.application.routes.draw do
         resources :dummy_users do
-          member { map_method :patch, :update }
+          member { map_method :patch, [:update] }
         end
       end