diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..5633375
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,6 @@
+AllCops:
+  Include:
+    - 'Gemfile'
+  Exclude:
+    - 'vendor/**/*'
+    - 'benchmarks/**/*'
diff --git a/Gemfile b/Gemfile
index e7841aa..6639e3b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,5 +2,4 @@ source 'https://rubygems.org'
 
 gemspec
 
-gem 'devtools', :git => 'https://github.com/rom-rb/devtools.git'
-eval File.read('Gemfile.devtools')
+gem 'devtools', git: 'https://github.com/mbj/devtools.git', branch: 'master'
diff --git a/Gemfile.devtools b/Gemfile.devtools
deleted file mode 100644
index 318d37b..0000000
--- a/Gemfile.devtools
+++ /dev/null
@@ -1,71 +0,0 @@
-# encoding: utf-8
-
-group :development do
-  gem 'rake',       '~> 10.3.2'
-  gem 'rspec',      '~> 3.0.0'
-  gem 'rspec-its',  '~> 1.0.1'
-  gem 'yard',       '~> 0.8.7.4'
-
-  platform :rbx do
-    gem 'rubysl-singleton', '~> 2.0.0'
-  end
-end
-
-group :yard do
-  gem 'kramdown', '~> 1.3.3'
-end
-
-group :guard do
-  gem 'guard',         '~> 2.6.1'
-  gem 'guard-bundler', '~> 2.0.0'
-  gem 'guard-rspec',   '~> 4.2.9'
-  gem 'guard-rubocop', '~> 1.1.0'
-
-  # file system change event handling
-  gem 'listen',     '~> 2.7.7'
-  gem 'rb-fchange', '~> 0.0.6', require: false
-  gem 'rb-fsevent', '~> 0.9.4', require: false
-  gem 'rb-inotify', '~> 0.9.5', require: false
-
-  # notification handling
-  gem 'libnotify',               '~> 0.8.3', require: false
-  gem 'rb-notifu',               '~> 0.0.4', require: false
-  gem 'terminal-notifier-guard', '~> 1.5.3', require: false
-end
-
-group :metrics do
-  gem 'coveralls', '~> 0.7.0'
-  gem 'flay',      '~> 2.5.0'
-  gem 'flog',      '~> 4.2.1'
-  gem 'reek',      '~> 1.3.7'
-  gem 'rubocop',   '~> 0.23.0'
-  gem 'simplecov', '~> 0.7.1'
-  gem 'yardstick', '~> 0.9.9'
-
-  platforms :mri do
-    gem 'mutant',       '~> 0.6.0'
-    gem 'mutant-rspec', '~> 0.6.0'
-  end
-
-  platforms :ruby_19, :ruby_20 do
-    gem 'yard-spellcheck', '~> 0.1.5'
-  end
-
-  platform :rbx do
-    gem 'json',               '~> 1.8.1'
-    gem 'racc',               '~> 1.4.11'
-    gem 'rubysl-logger',      '~> 2.0.0'
-    gem 'rubysl-open-uri',    '~> 2.0.0'
-    gem 'rubysl-prettyprint', '~> 2.0.3'
-  end
-end
-
-group :benchmarks do
-  gem 'rbench', '~> 0.2.3'
-end
-
-platform :jruby do
-  group :jruby do
-    gem 'jruby-openssl', '~> 0.9.4'
-  end
-end
diff --git a/config/flay.yml b/config/flay.yml
index 1ae5a76..d5454bb 100644
--- a/config/flay.yml
+++ b/config/flay.yml
@@ -1,3 +1,3 @@
 ---
 threshold: 12
-total_score: 74
+total_score: 72
diff --git a/config/rubocop.yml b/config/rubocop.yml
new file mode 100644
index 0000000..0c154c9
--- /dev/null
+++ b/config/rubocop.yml
@@ -0,0 +1,113 @@
+inherit_from: ../.rubocop.yml
+
+# Avoid parameter lists longer than five parameters.
+ParameterLists:
+  Max: 3
+  CountKeywordArgs: true
+
+# Avoid more than `Max` levels of nesting.
+BlockNesting:
+  Max: 3
+
+# Align with the style guide.
+CollectionMethods:
+  PreferredMethods:
+    collect:  'map'
+    inject:   'reduce'
+    find:     'detect'
+    find_all: 'select'
+
+# Do not force public/protected/private keyword to be indented at the same
+# level as the def keyword. My personal preference is to outdent these keywords
+# because I think when scanning code it makes it easier to identify the
+# sections of code and visually separate them. When the keyword is at the same
+# level I think it sort of blends in with the def keywords and makes it harder
+# to scan the code and see where the sections are.
+AccessModifierIndentation:
+  Enabled: false
+
+# Limit line length
+LineLength:
+  Max: 106
+
+# Disable documentation checking until a class needs to be documented once
+Documentation:
+  Enabled: false
+
+# Do not always use &&/|| instead of and/or.
+AndOr:
+  Enabled: false
+
+# Do not favor modifier if/unless usage when you have a single-line body
+IfUnlessModifier:
+  Enabled: false
+
+# Allow case equality operator (in limited use within the specs)
+CaseEquality:
+  Enabled: false
+
+# Constants do not always have to use SCREAMING_SNAKE_CASE
+ConstantName:
+  Enabled: false
+
+# Not all trivial readers/writers can be defined with attr_* methods
+TrivialAccessors:
+  Enabled: false
+
+# Allow empty lines around class body
+EmptyLinesAroundClassBody:
+  Enabled: false
+
+# Allow empty lines around module body
+EmptyLinesAroundModuleBody:
+  Enabled: false
+
+# Allow empty lines around block body
+EmptyLinesAroundBlockBody:
+  Enabled: false
+
+# Allow multiple line operations to not require indentation
+MultilineOperationIndentation:
+  Enabled: false
+
+# Prefer String#% over Kernel#sprintf
+FormatString:
+  Enabled: false
+
+# Use square brackets for literal Array objects
+PercentLiteralDelimiters:
+  PreferredDelimiters:
+    '%':  '{}'
+    '%i': '[]'
+    '%q': ()
+    '%Q': ()
+    '%r': '{}'
+    '%s': ()
+    '%w': '[]'
+    '%W': '[]'
+    '%x': ()
+
+# Align if/else blocks with the variable assignment
+EndAlignment:
+  AlignWith: variable
+
+# Do not always align parameters when it is easier to read
+AlignParameters:
+  Exclude:
+    - spec/**/*_spec.rb
+
+# Prefer #kind_of? over #is_a?
+ClassCheck:
+  EnforcedStyle: kind_of?
+
+# Do not prefer double quotes to be used when %q or %Q is more appropriate
+UnneededPercentQ:
+  Enabled: false
+
+# Allow a maximum ABC score
+Metrics/AbcSize:
+  Max: 21.02
+
+# Do not prefer lambda.call(...) over lambda.(...)
+LambdaCall:
+  Enabled: false
diff --git a/lib/request.rb b/lib/request.rb
index 1c2a88b..407028b 100644
--- a/lib/request.rb
+++ b/lib/request.rb
@@ -9,13 +9,22 @@
 # Library namespace and abstract base class
 class Request
 
-  KEYS = %W(
-    path_info protocol port request_method
-    host if_modified_since query_params query_params_hash
-    query_string content_length content_type body
-  ).map(&:to_sym).freeze
-
-  METHODS = (KEYS + %W(rack_env get? post?)).map(&:to_sym).freeze
+  KEYS = %w[
+    path_info
+    protocol
+    port
+    request_method
+    host
+    if_modified_since
+    query_params
+    query_params_hash
+    query_string
+    content_length
+    content_type
+    body
+  ].map(&:to_sym).freeze
+
+  METHODS = (KEYS + %w[rack_env get? post?]).map(&:to_sym).freeze
 
   include Adamantium::Flat, AbstractType, Equalizer.new(*KEYS)
 
@@ -98,7 +107,7 @@ def uid
   #
   def query_params_hash
     query_params.each_with_object({}) do |(key, value), hash|
-      hash[key]=value
+      hash[key] = value
     end
   end
   memoize :query_params_hash
@@ -153,7 +162,7 @@ def root_uri
   # @api private
   #
   def host_with_port
-    uhost, uport = self.host, self.port
+    uhost, uport = host, port
     if port != protocol.default_port
       "#{uhost}:#{uport}"
     else
diff --git a/lib/request/method.rb b/lib/request/method.rb
index 880a64d..8dcca2a 100644
--- a/lib/request/method.rb
+++ b/lib/request/method.rb
@@ -22,7 +22,7 @@ class Method
     attr_reader :verb
 
     INDEX = ALL.each_with_object({}) do |method, index|
-      index[method.verb]=method
+      index[method.verb] = method
     end.freeze
 
     # Return request method
diff --git a/lib/request/rack.rb b/lib/request/rack.rb
index 8cf42cd..c7c9348 100644
--- a/lib/request/rack.rb
+++ b/lib/request/rack.rb
@@ -94,7 +94,7 @@ def content_length
       end
 
       unless value =~ CONTENT_LENGTH_REGEXP
-        raise InvalidKeyError, 'invalid content length'
+        fail InvalidKeyError, 'invalid content length'
       end
 
       value.to_i
@@ -125,18 +125,18 @@ def query_params
     def if_modified_since
       value = @rack_env.fetch(IF_MODIFIED_SINCE) { return }
       begin
-        Time.httpdate(value) 
-      rescue ArgumentError 
+        Time.httpdate(value)
+      rescue ArgumentError
         nil
       end
     end
     memoize :if_modified_since
 
-    accessor(:path_info,    Key.new('PATH_INFO')        )
-    accessor(:host,         Key.new('SERVER_NAME')      )
-    accessor(:query_string, Key.new('QUERY_STRING')     )
+    accessor(:path_info,    Key.new('PATH_INFO'))
+    accessor(:host,         Key.new('SERVER_NAME'))
+    accessor(:query_string, Key.new('QUERY_STRING'))
     accessor(:content_type, Key.new('CONTENT_TYPE'), nil)
-    accessor(:body,         Key.new('rack.input')       )
+    accessor(:body,         Key.new('rack.input'))
 
   private
 
diff --git a/spec/shared/rack_env_accessor_behavior.rb b/spec/shared/rack_env_accessor_behavior.rb
index 8aa8df6..8ff62eb 100644
--- a/spec/shared/rack_env_accessor_behavior.rb
+++ b/spec/shared/rack_env_accessor_behavior.rb
@@ -23,7 +23,7 @@
 
   it 'should not freeze the input env' do
     subject
-    env.frozen?.should be(false)
+    expect(env.frozen?).to be(false)
   end
 end
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 5855b55..8479c74 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,8 +1,6 @@
 # encoding: utf-8
 
-require 'request'
 require 'devtools'
-Devtools.init_spec_helper
+require 'request'
 
-RSpec.configure do |config|
-end
+Devtools.init_spec_helper
diff --git a/spec/unit/request/key/hash_spec.rb b/spec/unit/request/key/hash_spec.rb
index 4c84887..0c09f5a 100644
--- a/spec/unit/request/key/hash_spec.rb
+++ b/spec/unit/request/key/hash_spec.rb
@@ -3,7 +3,7 @@
 describe Request::Key, '#hash' do
   subject { described_class.new(string).hash }
 
-  let(:string) { "teststring" }
+  let(:string) { 'teststring' }
 
   it { should == string.hash }
-end
\ No newline at end of file
+end
diff --git a/spec/unit/request/rack/content_length_spec.rb b/spec/unit/request/rack/content_length_spec.rb
index d2d1133..81e5abb 100644
--- a/spec/unit/request/rack/content_length_spec.rb
+++ b/spec/unit/request/rack/content_length_spec.rb
@@ -3,7 +3,7 @@
 describe Request::Rack, '#content_length' do
   subject { object.content_length }
 
-  let(:rack_key) { 'CONTENT_LENGTH'}
+  let(:rack_key) { 'CONTENT_LENGTH' }
 
   context 'with decimal positive integer' do
     it_should_behave_like 'a rack env accessor' do
@@ -40,7 +40,7 @@
 
     it_should_behave_like 'a rack env accessor' do
 
-      let(:expected_value) { 0                }
+      let(:expected_value) { 0 }
 
     end
   end