diff --git a/lib/epubmaker/content.rb b/lib/epubmaker/content.rb
index 4fee295d4..df0f4c8a2 100644
--- a/lib/epubmaker/content.rb
+++ b/lib/epubmaker/content.rb
@@ -39,7 +39,7 @@ def inspect
     # Construct Content object by passing a sequence of parameters or hash.
     # Keys of +hash+ relate with each parameters.
     # +file+ (or +hash+["file"]) is required. Others are optional.
-    def initialize(fileorhash, id = nil, media = nil, title = nil, level = nil, notoc = nil, properties = nil, chaptype = nil)
+    def initialize(fileorhash, id = nil, media = nil, title = nil, level = nil, notoc = nil, properties = nil, chaptype = nil) # rubocop:disable Metrics/ParameterLists
       if fileorhash.instance_of?(Hash)
         @id = fileorhash['id']
         @file = fileorhash['file']
diff --git a/lib/review/epubmaker.rb b/lib/review/epubmaker.rb
index 103c94023..6935a9f40 100644
--- a/lib/review/epubmaker.rb
+++ b/lib/review/epubmaker.rb
@@ -490,7 +490,7 @@ def push_contents(_basetmpdir)
           hash['id'] = args[:id]
         end
         if args[:properties].present?
-          hash['properties'] = args[:properties].split(' ')
+          hash['properties'] = args[:properties].split(' ') # rubocop:disable Style/RedundantArgument
         end
         if args[:notoc].present?
           hash['notoc'] = args[:notoc]
diff --git a/lib/review/exception.rb b/lib/review/exception.rb
index 91164fcff..ca0d781c9 100644
--- a/lib/review/exception.rb
+++ b/lib/review/exception.rb
@@ -10,10 +10,16 @@
 
 module ReVIEW
   class Error < ::StandardError; end
+
   class ApplicationError < Error; end
+
   class ConfigError < ApplicationError; end
+
   class CompileError < ApplicationError; end
+
   class SyntaxError < CompileError; end
+
   class FileNotFound < ApplicationError; end
+
   class KeyError < CompileError; end
 end
diff --git a/lib/review/latexutils.rb b/lib/review/latexutils.rb
index fada74977..19126d6a5 100644
--- a/lib/review/latexutils.rb
+++ b/lib/review/latexutils.rb
@@ -59,7 +59,7 @@ def initialize_metachars(texcommand)
         end
       end
 
-      @metachars_re = /[#{Regexp.escape(@metachars.keys.join(''))}]/u
+      @metachars_re = /[#{Regexp.escape(@metachars.keys.join(''))}]/u # rubocop:disable Style/RedundantArgument
 
       @metachars_invert = @metachars.invert
     end
diff --git a/review.gemspec b/review.gemspec
index 5e67e5b90..a937d82f5 100644
--- a/review.gemspec
+++ b/review.gemspec
@@ -25,8 +25,9 @@ Gem::Specification.new do |gem|
   gem.add_dependency('rubyzip')
   gem.add_development_dependency('pygments.rb')
   gem.add_development_dependency('rake')
-  gem.add_development_dependency('rubocop', '~> 1.3.0')
+  gem.add_development_dependency('rubocop', '~> 1.6.0')
   gem.add_development_dependency('rubocop-performance')
+  gem.add_development_dependency('rubocop-rake')
   gem.add_development_dependency('simplecov')
   gem.add_development_dependency('test-unit')
   gem.add_development_dependency('unicode-eaw')