diff --git a/.rubocop.yml b/.rubocop.yml
index c82ce1d8d..17439fba3 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,7 +1,7 @@
 AllCops:
+  DisplayCopNames: true
   Exclude:
-    - 'vendor/**/*'
-    - 'tmp/**/*'
     - 'test_app/**/*'
-    - 'bin/mutant'
+    - 'tmp/**/*'
+    - 'vendor/**/*'
   TargetRubyVersion: 2.2
diff --git a/bin/mutant b/bin/mutant
index 63516c24c..7472a46cb 100755
--- a/bin/mutant
+++ b/bin/mutant
@@ -21,7 +21,7 @@ namespace =
         .curry
         .call(Kernel),
       root_require:     'mutant',
-      includes: %w[
+      includes:         %w[
         mutant
         unparser
         morpher
diff --git a/config/rubocop.yml b/config/rubocop.yml
index a4eb1cef5..8e1a43dad 100644
--- a/config/rubocop.yml
+++ b/config/rubocop.yml
@@ -177,3 +177,6 @@ AlignHash:
 # Prefer `public_send` and `__send__` over `send`
 Send:
   Enabled: true
+
+Lint/UnifiedInteger:
+  Enabled: false
diff --git a/lib/mutant/color.rb b/lib/mutant/color.rb
index d2c65642e..703eeeedc 100644
--- a/lib/mutant/color.rb
+++ b/lib/mutant/color.rb
@@ -29,8 +29,7 @@ def format(text)
       # Initialize null color
       #
       # @return [undefined]
-      def initialize
-      end
+      def initialize; end
 
     end.new
 
diff --git a/lib/mutant/mutator/node/literal/nil.rb b/lib/mutant/mutator/node/literal/nil.rb
index e508cfd9f..f6d6ad8cd 100644
--- a/lib/mutant/mutator/node/literal/nil.rb
+++ b/lib/mutant/mutator/node/literal/nil.rb
@@ -12,8 +12,7 @@ class Nil < self
           # Emit mutations
           #
           # @return [undefined]
-          def dispatch
-          end
+          def dispatch; end
 
         end # Nil
       end # Literal
diff --git a/meta/case.rb b/meta/case.rb
index 5ff2ab860..4c767d4e6 100644
--- a/meta/case.rb
+++ b/meta/case.rb
@@ -29,6 +29,7 @@
   RUBY
 end
 
+# rubocop:disable Metrics/BlockLength
 Mutant::Meta::Example.add :case do
   source <<-RUBY
     case condition
diff --git a/mutant.gemspec b/mutant.gemspec
index 1022ae02a..5a069f635 100644
--- a/mutant.gemspec
+++ b/mutant.gemspec
@@ -1,5 +1,6 @@
 require File.expand_path('../lib/mutant/version', __FILE__)
 
+# rubocop:disable Metrics/BlockLength
 Gem::Specification.new do |gem|
   gem.name        = 'mutant'
   gem.version     = Mutant::VERSION.dup
diff --git a/spec/support/xspec.rb b/spec/support/xspec.rb
index 6467a1ad5..2638dcca5 100644
--- a/spec/support/xspec.rb
+++ b/spec/support/xspec.rb
@@ -77,9 +77,9 @@ def self.assert_not_empty(event_list)
     private_class_method :assert_not_empty
 
     def self.assert_total(event_list)
-      if event_list[0..-2].map(&:first).any?(&TERMINATE_EVENTS.method(:include?))
-        fail "Reaction not total: #{event_list}"
-      end
+      return unless event_list[0..-2].map(&:first).any?(&TERMINATE_EVENTS.method(:include?))
+
+      fail "Reaction not total: #{event_list}"
     end
     private_class_method :assert_total
   end # MessageReaction
diff --git a/spec/unit/mutant/env/bootstrap_spec.rb b/spec/unit/mutant/env/bootstrap_spec.rb
index 10cb404d8..2606fe087 100644
--- a/spec/unit/mutant/env/bootstrap_spec.rb
+++ b/spec/unit/mutant/env/bootstrap_spec.rb
@@ -93,8 +93,7 @@ def self.name
         # Fix Class#name so other specs do not see this one
         class << invalid_class
           undef :name
-          def name
-          end
+          def name; end
         end
       end
 
@@ -151,8 +150,7 @@ def self.name
         # Fix Class#name so other specs do not see this one
         class << invalid_class
           undef :name
-          def name
-          end
+          def name; end
         end
       end
 
diff --git a/spec/unit/mutant/matcher/methods/instance_spec.rb b/spec/unit/mutant/matcher/methods/instance_spec.rb
index f4621b93f..4b93b6c31 100644
--- a/spec/unit/mutant/matcher/methods/instance_spec.rb
+++ b/spec/unit/mutant/matcher/methods/instance_spec.rb
@@ -4,11 +4,9 @@
 
   let(:class_under_test) do
     parent = Module.new do
-      def method_d
-      end
+      def method_d; end
 
-      def method_e
-      end
+      def method_e; end
     end
 
     Class.new do
@@ -16,18 +14,15 @@ def method_e
 
       private :method_d
 
-      def method_a
-      end
+      def method_a; end
 
     protected
 
-      def method_b
-      end
+      def method_b; end
 
     private
 
-      def method_c
-      end
+      def method_c; end
     end
   end
 
diff --git a/spec/unit/mutant/matcher/methods/singleton_spec.rb b/spec/unit/mutant/matcher/methods/singleton_spec.rb
index 7f8970df7..ac5e2682d 100644
--- a/spec/unit/mutant/matcher/methods/singleton_spec.rb
+++ b/spec/unit/mutant/matcher/methods/singleton_spec.rb
@@ -4,25 +4,20 @@
 
   let(:class_under_test) do
     parent = Module.new do
-      def method_d
-      end
+      def method_d; end
 
-      def method_e
-      end
+      def method_e; end
     end
 
     Class.new do
       extend parent
 
-      def self.method_a
-      end
+      def self.method_a; end
 
-      def self.method_b
-      end
+      def self.method_b; end
       class << self; protected :method_b; end
 
-      def self.method_c
-      end
+      def self.method_c; end
       private_class_method :method_c
 
     end
diff --git a/spec/unit/mutant/repository/diff_spec.rb b/spec/unit/mutant/repository/diff_spec.rb
index eef3760ff..a7957d170 100644
--- a/spec/unit/mutant/repository/diff_spec.rb
+++ b/spec/unit/mutant/repository/diff_spec.rb
@@ -27,6 +27,7 @@
     subject { object.touches?(path, line_range) }
 
     shared_context 'test if git tracks the file' do
+      # rubocop:disable Lint/UnneededSplatExpansion
       before do
         expect(config.kernel).to receive(:system)
           .ordered
diff --git a/spec/unit/mutant/subject/method/instance_spec.rb b/spec/unit/mutant/subject/method/instance_spec.rb
index 5ee5fb112..23fb1ef89 100644
--- a/spec/unit/mutant/subject/method/instance_spec.rb
+++ b/spec/unit/mutant/subject/method/instance_spec.rb
@@ -20,8 +20,7 @@ def initialize
         @bar = :boo
       end
 
-      def foo
-      end
+      def foo; end
 
       def self.name
         'Test'
@@ -84,8 +83,7 @@ def self.name
     let(:scope) do
       Class.new do
         include Memoizable
-        def foo
-        end
+        def foo; end
         memoize :foo
       end
     end