diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 7664f6c3..a576c435 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -376,15 +376,6 @@ Naming/VariableNumber:
   Exclude:
     - 'spec/models/ticket_purchase_spec.rb'
 
-# Offense count: 4
-# Cop supports --auto-correct.
-# Configuration parameters: AutoCorrect.
-Performance/HashEachMethods:
-  Exclude:
-    - 'app/controllers/admin/conferences_controller.rb'
-    - 'app/helpers/application_helper.rb'
-    - 'db/migrate/20140701123203_add_events_per_week_to_conference.rb'
-    - 'spec/factories/event_users.rb'
 
 # Offense count: 1
 # Cop supports --auto-correct.
diff --git a/app/controllers/admin/conferences_controller.rb b/app/controllers/admin/conferences_controller.rb
index 8f8f2959..921a23d1 100644
--- a/app/controllers/admin/conferences_controller.rb
+++ b/app/controllers/admin/conferences_controller.rb
@@ -155,7 +155,7 @@ module Admin
 
       # Set line color using a hash function
       @tickets = []
-      @tickets_data.keys.each do |title|
+      @tickets_data.each_key do |title|
         @tickets.append(short_title: title, color: "\##{Digest::MD5.hexdigest(title)[0..5]}")
       end
 
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index b1e249ba..9497cb1c 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -99,7 +99,7 @@ module ApplicationHelper
   end
 
   def normalize_array_length(hashmap, length)
-    hashmap.each do |_, value|
+    hashmap.each_value do |value|
       if value.length < length
         value.fill(value[-1], value.length...length)
       end
diff --git a/app/views/schedules/show.xml.haml b/app/views/schedules/show.xml.haml
index 541377ad..f42ad801 100644
--- a/app/views/schedules/show.xml.haml
+++ b/app/views/schedules/show.xml.haml
@@ -9,10 +9,10 @@
     %timeslot_duration= length_timestamp(@conference.program.schedule_interval)
 
   - if @events_xml.any?
-    - @events_xml.keys.each.with_index(1) do |day, index|
+    - @events_xml.each_key.with_index(1) do |day, index|
       %day{ date: day, index: index }
         - events_in_rooms = @events_xml[day].group_by(&:room)
-        - events_in_rooms.keys.each do |room|
+        - events_in_rooms.each_key do |room|
           %room{ name: room.name }
             - events_in_rooms[room].each do |event|
               %event{ guid: event.guid, id: event.id }
diff --git a/db/migrate/20140701123203_add_events_per_week_to_conference.rb b/db/migrate/20140701123203_add_events_per_week_to_conference.rb
index 36bbf40d..2b4d3342 100644
--- a/db/migrate/20140701123203_add_events_per_week_to_conference.rb
+++ b/db/migrate/20140701123203_add_events_per_week_to_conference.rb
@@ -77,7 +77,7 @@ class AddEventsPerWeekToConference < ActiveRecord::Migration
 
       hash.each do |week, values|
         if previous
-          values.each do |state, _value|
+          values.each_key do |state|
             hash[week][state] += previous[state]
           end
         end
diff --git a/spec/factories/event_users.rb b/spec/factories/event_users.rb
index 78bcd10d..5d1574a9 100644
--- a/spec/factories/event_users.rb
+++ b/spec/factories/event_users.rb
@@ -4,7 +4,7 @@ FactoryGirl.define do
   factory :event_user do
     user
 
-    Hash[EventUser::ROLES].values.each do |role|
+    Hash[EventUser::ROLES].each_value do |role|
       factory role do
         event_role role
       end