diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 566eec83..56b6555a 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,77 +1,28 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2018-12-18 20:02:43 -0300 using RuboCop version 0.59.2.
+# on 2019-01-23 23:57:48 -0300 using RuboCop version 0.50.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 1
-# Configuration parameters: Include.
-# Include: **/*.gemspec
-Gemspec/RequiredRubyVersion:
-  Exclude:
-    - 'exception_notification.gemspec'
-
-# Offense count: 2
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyleAlignWith, AutoCorrect, Severity.
-# SupportedStylesAlignWith: keyword, variable, start_of_line
-Layout/EndAlignment:
-  Exclude:
-    - 'lib/exception_notifier/campfire_notifier.rb'
-    - 'lib/exception_notifier/hipchat_notifier.rb'
-
-# Offense count: 2
-# Cop supports --auto-correct.
-Layout/RescueEnsureAlignment:
-  Exclude:
-    - 'lib/exception_notifier/modules/error_grouping.rb'
-    - 'test/exception_notifier/webhook_notifier_test.rb'
-
-# Offense count: 2
-# Configuration parameters: AllowSafeAssignment.
-Lint/AssignmentInCondition:
-  Exclude:
-    - 'lib/exception_notifier/modules/error_grouping.rb'
-
-# Offense count: 12
+# Offense count: 4
 Lint/RescueException:
   Exclude:
-    - 'examples/sinatra/sinatra_app.rb'
     - 'lib/exception_notification/rack.rb'
     - 'lib/exception_notification/sidekiq.rb'
     - 'lib/exception_notifier.rb'
-    - 'test/exception_notifier/campfire_notifier_test.rb'
-    - 'test/exception_notifier/hipchat_notifier_test.rb'
-    - 'test/exception_notifier/irc_notifier_test.rb'
-    - 'test/exception_notifier/slack_notifier_test.rb'
-    - 'test/exception_notifier/sns_notifier_test.rb'
-    - 'test/exception_notifier/webhook_notifier_test.rb'
-
-# Offense count: 2
-# Configuration parameters: ContextCreatingMethods, MethodCreatingMethods.
-Lint/UselessAccessModifier:
-  Exclude:
-    - 'lib/exception_notifier/datadog_notifier.rb'
-    - 'test/exception_notifier/datadog_notifier_test.rb'
-
-# Offense count: 1
-Lint/UselessAssignment:
-  Exclude:
-    - 'lib/exception_notifier/sns_notifier.rb'
 
 # Offense count: 18
 Metrics/AbcSize:
-  Max: 97
+  Max: 98
 
 # Offense count: 3
 # Configuration parameters: CountComments, ExcludedMethods.
-# ExcludedMethods: refine
 Metrics/BlockLength:
   Max: 88
 
-# Offense count: 10
+# Offense count: 11
 # Configuration parameters: CountComments.
 Metrics/ClassLength:
   Max: 186
@@ -80,8 +31,14 @@ Metrics/ClassLength:
 Metrics/CyclomaticComplexity:
   Max: 24
 
-# Offense count: 28
-# Configuration parameters: CountComments, ExcludedMethods.
+# Offense count: 253
+# Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
+# URISchemes: http, https
+Metrics/LineLength:
+  Max: 226
+
+# Offense count: 29
+# Configuration parameters: CountComments.
 Metrics/MethodLength:
   Max: 90
 
@@ -90,8 +47,12 @@ Metrics/PerceivedComplexity:
   Max: 24
 
 # Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: AutoCorrect, EnforcedStyle.
+Style/CaseEquality:
+  Exclude:
+    - 'test/exception_notification/resque_test.rb'
+
+# Offense count: 1
+# Configuration parameters: EnforcedStyle, SupportedStyles.
 # SupportedStyles: nested, compact
 Style/ClassAndModuleChildren:
   Exclude:
@@ -103,7 +64,7 @@ Style/ClassVars:
     - 'lib/exception_notifier.rb'
     - 'test/exception_notifier/modules/error_grouping_test.rb'
 
-# Offense count: 28
+# Offense count: 29
 Style/Documentation:
   Enabled: false
 
@@ -112,11 +73,6 @@ Style/DoubleNegation:
   Exclude:
     - 'lib/exception_notifier/irc_notifier.rb'
 
-# Offense count: 1
-Style/EvalWithLocation:
-  Exclude:
-    - 'test/exception_notifier_test.rb'
-
 # Offense count: 6
 # Configuration parameters: MinBodyLength.
 Style/GuardClause:
@@ -128,53 +84,25 @@ Style/GuardClause:
     - 'lib/exception_notifier/slack_notifier.rb'
     - 'lib/exception_notifier/sns_notifier.rb'
 
-# Offense count: 7
+# Offense count: 1
 # Cop supports --auto-correct.
-Style/IfUnlessModifier:
-  Exclude:
-    - 'lib/exception_notification/rack.rb'
-    - 'lib/exception_notifier/datadog_notifier.rb'
-    - 'lib/exception_notifier/google_chat_notifier.rb'
-    - 'lib/exception_notifier/webhook_notifier.rb'
-    - 'test/dummy/test/functional/posts_controller_test.rb'
-    - 'test/exception_notifier/email_notifier_test.rb'
-
-# Offense count: 3
-Style/MethodMissingSuper:
+Style/MethodCallWithoutArgsParentheses:
   Exclude:
-    - 'lib/exception_notifier/email_notifier.rb'
-    - 'lib/exception_notifier/mattermost_notifier.rb'
-    - 'lib/exception_notifier/teams_notifier.rb'
+    - 'test/exception_notification/resque_test.rb'
 
 # Offense count: 3
-Style/MissingRespondToMissing:
+Style/MethodMissing:
   Exclude:
     - 'lib/exception_notifier/email_notifier.rb'
     - 'lib/exception_notifier/mattermost_notifier.rb'
     - 'lib/exception_notifier/teams_notifier.rb'
 
-# Offense count: 1
-Style/MultilineBlockChain:
-  Exclude:
-    - 'lib/exception_notifier/email_notifier.rb'
-
-# Offense count: 2
-Style/NestedTernaryOperator:
-  Exclude:
-    - 'lib/exception_notifier/slack_notifier.rb'
-    - 'lib/exception_notifier/sns_notifier.rb'
-
-# Offense count: 1
+# Offense count: 18
 # Cop supports --auto-correct.
-# Configuration parameters: AutoCorrect, EnforcedStyle, IgnoredMethods.
-# SupportedStyles: predicate, comparison
-Style/NumericPredicate:
+# Configuration parameters: EnforcedStyle, SupportedStyles, ConsistentQuotesInMultiline.
+# SupportedStyles: single_quotes, double_quotes
+Style/StringLiterals:
   Exclude:
-    - 'spec/**/*'
-    - 'test/exception_notifier/modules/error_grouping_test.rb'
-
-# Offense count: 253
-# Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
-# URISchemes: http, https
-Metrics/LineLength:
-  Max: 226
+    - 'lib/exception_notifier/datadog_notifier.rb'
+    - 'test/exception_notification/resque_test.rb'
+    - 'test/exception_notifier/datadog_notifier_test.rb'
diff --git a/examples/sinatra/sinatra_app.rb b/examples/sinatra/sinatra_app.rb
index 65d31bbf..6e0dec51 100644
--- a/examples/sinatra/sinatra_app.rb
+++ b/examples/sinatra/sinatra_app.rb
@@ -28,7 +28,7 @@ class SinatraApp < Sinatra::Base
   get '/background_notification' do
     begin
       1 / 0
-    rescue Exception => e
+    rescue StandardError => e
       ExceptionNotifier.notify_exception(e, data: { msg: 'Cannot divide by zero!' })
     end
     'Check email at <a href="http://localhost:1080">mailcatcher</a>.'
diff --git a/lib/exception_notification/resque.rb b/lib/exception_notification/resque.rb
index 40b9743b..288f117d 100644
--- a/lib/exception_notification/resque.rb
+++ b/lib/exception_notification/resque.rb
@@ -13,7 +13,7 @@ def save
         failed_at: Time.now.to_s,
         payload: payload,
         queue: queue,
-        worker: worker.to_s,
+        worker: worker.to_s
       }
 
       ExceptionNotifier.notify_exception(exception, data: { resque: data })
diff --git a/lib/exception_notifier/campfire_notifier.rb b/lib/exception_notifier/campfire_notifier.rb
index bf7c743f..881f8965 100644
--- a/lib/exception_notifier/campfire_notifier.rb
+++ b/lib/exception_notifier/campfire_notifier.rb
@@ -22,7 +22,7 @@ def call(exception, options = {})
                     "The exception occurred #{options[:accumulated_errors_count]} times: '#{exception.message}'"
                   else
                     "A new exception occurred: '#{exception.message}'"
-        end
+                  end
         message += " on '#{exception.backtrace.first}'" if exception.backtrace
         send_notice(exception, options, message) do |msg, _|
           @room.paste msg
diff --git a/lib/exception_notifier/datadog_notifier.rb b/lib/exception_notifier/datadog_notifier.rb
index 1697474d..9fc3dbf8 100644
--- a/lib/exception_notifier/datadog_notifier.rb
+++ b/lib/exception_notifier/datadog_notifier.rb
@@ -22,8 +22,6 @@ def datadog_event(exception, options = {})
       ).event
     end
 
-    private
-
     class DatadogExceptionEvent
       include ExceptionNotifier::BacktraceCleaner
 
diff --git a/lib/exception_notifier/email_notifier.rb b/lib/exception_notifier/email_notifier.rb
index c4eaeac3..ede9b1cb 100644
--- a/lib/exception_notifier/email_notifier.rb
+++ b/lib/exception_notifier/email_notifier.rb
@@ -58,7 +58,7 @@ def background_exception_notification(exception, options = {}, default_options =
           private
 
           def compose_subject
-            subject = "#{@options[:email_prefix]}"
+            subject = @options[:email_prefix].to_s.dup
             subject << "(#{@options[:accumulated_errors_count]} times)" if @options[:accumulated_errors_count].to_i > 1
             subject << "#{@kontroller.controller_name} #{@kontroller.action_name}" if @kontroller && @options[:include_controller_and_action_names_in_subject]
             subject << " (#{@exception.class})"
@@ -141,7 +141,8 @@ def initialize(options)
       mailer_settings_key = "#{delivery_method}_settings".to_sym
       options[:mailer_settings] = options.delete(mailer_settings_key)
 
-      options.reverse_merge(EmailNotifier.default_options).select do |k, _v|
+      merged_opts = options.reverse_merge(EmailNotifier.default_options)
+      filtered_opts = merged_opts.select do |k, _v|
         %i[
           sender_address exception_recipients pre_callback
           post_callback email_prefix email_format
@@ -149,7 +150,9 @@ def initialize(options)
           include_controller_and_action_names_in_subject delivery_method mailer_settings
           email_headers mailer_parent template_path deliver_with
         ].include?(k)
-      end .each { |k, v| send("#{k}=", v) }
+      end
+
+      filtered_opts.each { |k, v| send("#{k}=", v) }
     end
 
     def options
diff --git a/lib/exception_notifier/hipchat_notifier.rb b/lib/exception_notifier/hipchat_notifier.rb
index 9d851037..b45cc588 100644
--- a/lib/exception_notifier/hipchat_notifier.rb
+++ b/lib/exception_notifier/hipchat_notifier.rb
@@ -20,7 +20,7 @@ def initialize(options)
                   "The exception occurred #{errors_count} times: '#{Rack::Utils.escape_html(exception.message)}'"
                 else
                   "A new exception occurred: '#{Rack::Utils.escape_html(exception.message)}'"
-          end
+                end
           msg += " on '#{exception.backtrace.first}'" if exception.backtrace
           msg
         }
diff --git a/lib/exception_notifier/modules/error_grouping.rb b/lib/exception_notifier/modules/error_grouping.rb
index 4f6c2cc2..3aefff0e 100644
--- a/lib/exception_notifier/modules/error_grouping.rb
+++ b/lib/exception_notifier/modules/error_grouping.rb
@@ -46,13 +46,13 @@ def group_error!(exception, options)
         message_based_key = "exception:#{Zlib.crc32("#{exception.class.name}\nmessage:#{exception.message}")}"
         accumulated_errors_count = 1
 
-        if count = error_count(message_based_key)
+        if (count = error_count(message_based_key))
           accumulated_errors_count = count + 1
           save_error_count(message_based_key, accumulated_errors_count)
         else
           backtrace_based_key = "exception:#{Zlib.crc32("#{exception.class.name}\npath:#{exception.backtrace.try(:first)}")}"
 
-          if count = error_grouping_cache.read(backtrace_based_key)
+          if (count = error_grouping_cache.read(backtrace_based_key))
             accumulated_errors_count = count + 1
             save_error_count(backtrace_based_key, accumulated_errors_count)
           else
diff --git a/lib/exception_notifier/slack_notifier.rb b/lib/exception_notifier/slack_notifier.rb
index 8202ef52..fe9ab7a1 100644
--- a/lib/exception_notifier/slack_notifier.rb
+++ b/lib/exception_notifier/slack_notifier.rb
@@ -20,13 +20,13 @@ def initialize(options)
       end
     end
 
-    def call(exception, options={})
-      clean_message = exception.message.gsub("`", "'")
+    def call(exception, options = {})
+      clean_message = exception.message.tr('`', "'")
       attchs = attchs(exception, clean_message, options)
 
       if valid?
         args = [exception, options, clean_message, @message_opts.merge(attachments: attchs)]
-        send_notice(*args) do |msg, message_opts|
+        send_notice(*args) do |_msg, message_opts|
           @notifier.ping '', message_opts
         end
       end
@@ -52,13 +52,19 @@ def attchs(exception, clean_message, options)
       text, data = information_from_options(exception.class, options)
       fields = fields(clean_message, exception.backtrace, data)
 
-      [color: @color, text: text, fields: fields, mrkdwn_in: %w(text fields)]
+      [color: @color, text: text, fields: fields, mrkdwn_in: %w[text fields]]
     end
 
     def information_from_options(exception_class, options)
       errors_count = options[:accumulated_errors_count].to_i
-      measure_word = errors_count > 1 ? errors_count : (exception_class.to_s =~ /^[aeiou]/i ? 'An' : 'A')
-      exception_name = "*#{measure_word}* `#{exception_class.to_s}`"
+
+      measure_word = if errors_count > 1
+                       errors_count
+                     else
+                       exception_class.to_s =~ /^[aeiou]/i ? 'An' : 'A'
+                     end
+
+      exception_name = "*#{measure_word}* `#{exception_class}`"
       env = options[:env]
 
       if env.nil?
@@ -90,7 +96,7 @@ def fields(clean_message, backtrace, data)
 
       unless data.empty?
         deep_reject(data, @ignore_data_if) if @ignore_data_if.is_a?(Proc)
-        data_string = data.map{|k,v| "#{k}: #{v}"}.join("\n")
+        data_string = data.map { |k, v| "#{k}: #{v}" }.join("\n")
         fields << { title: 'Data', value: "```#{data_string}```" }
       end
 
diff --git a/lib/exception_notifier/sns_notifier.rb b/lib/exception_notifier/sns_notifier.rb
index b1d67332..fbd7f72e 100644
--- a/lib/exception_notifier/sns_notifier.rb
+++ b/lib/exception_notifier/sns_notifier.rb
@@ -59,13 +59,19 @@ def build_message(exception, options)
 
       if exception.backtrace
         formatted_backtrace = exception.backtrace.first(options[:backtrace_lines]).join("\n").to_s
-        text += "Backtrace:\n#{formatted_backtrace}\n"
+        text + "Backtrace:\n#{formatted_backtrace}\n"
       end
     end
 
     def accumulated_exception_name(exception, options)
       errors_count = options[:accumulated_errors_count].to_i
-      measure_word = errors_count > 1 ? errors_count : (exception.class.to_s =~ /^[aeiou]/i ? 'An' : 'A')
+
+      measure_word = if errors_count > 1
+                       errors_count
+                     else
+                       exception.class.to_s =~ /^[aeiou]/i ? 'An' : 'A'
+                     end
+
       "#{measure_word} #{exception.class}"
     end
 
diff --git a/lib/generators/exception_notification/install_generator.rb b/lib/generators/exception_notification/install_generator.rb
index d4f78b38..52d5b2f0 100644
--- a/lib/generators/exception_notification/install_generator.rb
+++ b/lib/generators/exception_notification/install_generator.rb
@@ -8,7 +8,7 @@ class InstallGenerator < Rails::Generators::Base
       class_option :sidekiq, type: :boolean, desc: 'Add support for sending notifications when errors occur in Sidekiq jobs.'
 
       def copy_initializer
-        template 'exception_notification.rb', 'config/initializers/exception_notification.rb'
+        template 'exception_notification.rb.erb', 'config/initializers/exception_notification.rb'
       end
     end
   end
diff --git a/lib/generators/exception_notification/templates/exception_notification.rb b/lib/generators/exception_notification/templates/exception_notification.rb.erb
similarity index 100%
rename from lib/generators/exception_notification/templates/exception_notification.rb
rename to lib/generators/exception_notification/templates/exception_notification.rb.erb
diff --git a/test/exception_notifier/campfire_notifier_test.rb b/test/exception_notifier/campfire_notifier_test.rb
index 2594f7cc..e3065a97 100644
--- a/test/exception_notifier/campfire_notifier_test.rb
+++ b/test/exception_notifier/campfire_notifier_test.rb
@@ -101,7 +101,7 @@ def fake_notification
 
   def fake_exception
     5 / 0
-  rescue Exception => e
+  rescue StandardError => e
     e
   end
 
diff --git a/test/exception_notifier/datadog_notifier_test.rb b/test/exception_notifier/datadog_notifier_test.rb
index 78cc7804..556d1098 100644
--- a/test/exception_notifier/datadog_notifier_test.rb
+++ b/test/exception_notifier/datadog_notifier_test.rb
@@ -92,8 +92,6 @@ def setup
     assert_equal event.aggregation_key, [event.msg_title]
   end
 
-  private
-
   class FakeDatadogClient
     def emit_event(event); end
   end
diff --git a/test/exception_notifier/hipchat_notifier_test.rb b/test/exception_notifier/hipchat_notifier_test.rb
index c69d7ab0..b5e944bf 100644
--- a/test/exception_notifier/hipchat_notifier_test.rb
+++ b/test/exception_notifier/hipchat_notifier_test.rb
@@ -197,13 +197,13 @@ def fake_body
 
   def fake_exception
     5 / 0
-  rescue Exception => e
+  rescue StandardError => e
     e
   end
 
   def fake_exception_with_html_characters
     raise StandardError, 'an error with <html> characters'
-  rescue Exception => e
+  rescue StandardError => e
     e
   end
 
diff --git a/test/exception_notifier/irc_notifier_test.rb b/test/exception_notifier/irc_notifier_test.rb
index dacb989d..32d0095e 100644
--- a/test/exception_notifier/irc_notifier_test.rb
+++ b/test/exception_notifier/irc_notifier_test.rb
@@ -102,11 +102,13 @@ class IrcNotifierTest < ActiveSupport::TestCase
       prefix: '[test notification]'
     }
 
-    CarrierPigeon.expects(:send).with(has_entries(
-                                        ssl: true,
-                                        join: true,
-                                        notice: true
-                                      )) do |v|
+    entries = {
+      ssl: true,
+      join: true,
+      notice: true
+    }
+
+    CarrierPigeon.expects(:send).with(has_entries(entries)) do |v|
       /\[test notification\]/.match(v[:message])
     end
 
@@ -125,7 +127,7 @@ class IrcNotifierTest < ActiveSupport::TestCase
 
   def fake_exception
     5 / 0
-  rescue Exception => e
+  rescue StandardError => e
     e
   end
 
diff --git a/test/exception_notifier/modules/error_grouping_test.rb b/test/exception_notifier/modules/error_grouping_test.rb
index 56270e07..1365cd0b 100644
--- a/test/exception_notifier/modules/error_grouping_test.rb
+++ b/test/exception_notifier/modules/error_grouping_test.rb
@@ -155,7 +155,7 @@ module TestModule
   end
 
   test 'use specified trigger in .send_notification?' do
-    trigger = proc { |_exception, count| count % 4 == 0 }
+    trigger = proc { |_exception, count| (count % 4).zero? }
     TestModule.stubs(:notification_trigger).returns(trigger)
 
     count = 16
diff --git a/test/exception_notifier/slack_notifier_test.rb b/test/exception_notifier/slack_notifier_test.rb
index c4636674..69ca489c 100644
--- a/test/exception_notifier/slack_notifier_test.rb
+++ b/test/exception_notifier/slack_notifier_test.rb
@@ -173,7 +173,7 @@ def setup
 
   def fake_exception
     5 / 0
-  rescue Exception => e
+  rescue StandardError => e
     e
   end
 
diff --git a/test/exception_notifier/sns_notifier_test.rb b/test/exception_notifier/sns_notifier_test.rb
index a68813ab..8d3ae40a 100644
--- a/test/exception_notifier/sns_notifier_test.rb
+++ b/test/exception_notifier/sns_notifier_test.rb
@@ -100,7 +100,7 @@ class ExamplesController < ActionController::Base; end
 
   def fake_exception
     1 / 0
-  rescue Exception => e
+  rescue StandardError => e
     e
   end
 
diff --git a/test/exception_notifier/webhook_notifier_test.rb b/test/exception_notifier/webhook_notifier_test.rb
index 010f0a52..26c6903f 100644
--- a/test/exception_notifier/webhook_notifier_test.rb
+++ b/test/exception_notifier/webhook_notifier_test.rb
@@ -86,7 +86,7 @@ def fake_params
   def fake_exception
     @fake_exception ||= begin
       5 / 0
-    rescue Exception => e
+    rescue StandardError => e
       e
     end
   end