diff --git a/.rubocop.yml b/.rubocop.yml
index 7a593149..c82ce1d8 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,11 +1,7 @@
 AllCops:
-  Include:
-    - 'Gemfile'
   Exclude:
-    - 'Gemfile.devtools'
     - 'vendor/**/*'
     - 'tmp/**/*'
     - 'test_app/**/*'
-    - 'benchmarks/**/*'
     - 'bin/mutant'
   TargetRubyVersion: 2.2
diff --git a/Rakefile b/Rakefile
index 7c8b3edb..6a30d31c 100644
--- a/Rakefile
+++ b/Rakefile
@@ -16,23 +16,10 @@ namespace :metrics do
       --use rspec
       --zombie
     ]
-    arguments.concat(%W[--jobs 4]) if ENV.key?('CIRCLE_CI')
+    arguments.concat(%w[--jobs 4]) if ENV.key?('CIRCLE_CI')
 
     arguments.concat(%w[-- Mutant*])
 
-    success = Kernel.system(*arguments) or fail 'Mutant task is not successful'
-  end
-end
-
-desc 'Generate mutation operator listing'
-task :list do
-  require 'mutant'
-  # TODO: Add a nice public interface
-  registry = Mutant::Mutator::Registry.send(:registry)
-  registry.keys.select do |key|
-    key.is_a?(Symbol)
-  end.sort.each do |type|
-    mutator = registry.fetch(type)
-    puts '%-18s: %s' % [type, mutator.name.sub(/\AMutant::Mutator::Node::/, '')]
+    Kernel.system(*arguments) or fail 'Mutant task is not successful'
   end
 end
diff --git a/config/rubocop.yml b/config/rubocop.yml
index 64d93f50..a4eb1cef 100644
--- a/config/rubocop.yml
+++ b/config/rubocop.yml
@@ -29,9 +29,17 @@ LineLength:
 Documentation:
   Enabled: false
 
-# Do not always use &&/|| instead of and/or.
+# Permit
+#
+#     boolean_check? or fail
+#
+# Reject
+#
+#     if foo or bar
+#       ...
+#     end
 AndOr:
-  Enabled: false
+  EnforcedStyle: conditionals
 
 # Do not favor modifier if/unless usage when you have a single-line body
 IfUnlessModifier:
@@ -90,11 +98,6 @@ SymbolArray:
 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?
@@ -152,10 +155,25 @@ RedundantFreeze:
 IndentArray:
   Enabled: false
 
-# My style is not supported
+# Prefer
+#
+#     some_receiver
+#       .foo
+#       .bar
+#       .baz
+#
+# Over
+#
+#     some_receiver.foo
+#                  .bar
+#                  .baz
 MultilineMethodCallIndentation:
-  Enabled: false
+  EnforcedStyle: indented
 
 # Align keys and values in a multiline hash
-Style/AlignHash:
+AlignHash:
   EnforcedColonStyle: table
+
+# Prefer `public_send` and `__send__` over `send`
+Send:
+  Enabled: true
diff --git a/mutant.gemspec b/mutant.gemspec
index 7cfcf911..418421f8 100644
--- a/mutant.gemspec
+++ b/mutant.gemspec
@@ -10,9 +10,9 @@ Gem::Specification.new do |gem|
   gem.homepage    = 'https://github.com/mbj/mutant'
   gem.license     = 'MIT'
 
-  gem.require_paths    = %w[lib]
+  gem.require_paths = %w[lib]
 
-  mutant_integration_files   = `git ls-files -- lib/mutant/integration/*.rb`.split("\n")
+  mutant_integration_files = `git ls-files -- lib/mutant/integration/*.rb`.split("\n")
 
   gem.files            = `git ls-files`.split("\n") - mutant_integration_files
   gem.test_files       = `git ls-files -- spec/{unit,integration}`.split("\n")
diff --git a/spec/support/xspec.rb b/spec/support/xspec.rb
index 84884e72..24f75643 100644
--- a/spec/support/xspec.rb
+++ b/spec/support/xspec.rb
@@ -9,7 +9,7 @@ module XSpec
 
     def call(observation)
       event_list.map do |event, object|
-        send(event, observation, object)
+        __send__(event, observation, object)
       end.last
     end
 
diff --git a/spec/unit/mutant/parallel/master_spec.rb b/spec/unit/mutant/parallel/master_spec.rb
index c42f70db..899d55bb 100644
--- a/spec/unit/mutant/parallel/master_spec.rb
+++ b/spec/unit/mutant/parallel/master_spec.rb
@@ -72,7 +72,7 @@ RSpec.describe Mutant::Parallel::Master do
 
   # Needed because of rubies undefined-ivar-read-is-nil stuff
   describe 'object initialization' do
-    let(:object) { described_class.send(:new, config, actor_env.mailbox(:master)) }
+    let(:object) { described_class.__send__(:new, config, actor_env.mailbox(:master)) }
 
     it 'initializes falsy ivars' do
       expect(object.instance_variable_get(:@stop)).to be(false)