diff --git a/.rubocop.yml b/.rubocop.yml
index 074d0225..f5399879 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -17,8 +17,6 @@ AllCops:
 #################### Metrics ###############################
 
 # Start with cops for Ruby >= 2.3 disabled
-Style/FrozenStringLiteralComment:
-  Enabled: false
 Style/SafeNavigation:
   Enabled: false
 Style/NumericPredicate:
diff --git a/app/views/admin/booths/_all_booths.xlsx.axlsx b/app/views/admin/booths/_all_booths.xlsx.axlsx
index bd1cc1db..43f77b49 100644
--- a/app/views/admin/booths/_all_booths.xlsx.axlsx
+++ b/app/views/admin/booths/_all_booths.xlsx.axlsx
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb.add_worksheet(name: 'all booths') do |sheet|
   bold_style = wb.styles.add_style(b: true)
   wrap_text = wb.styles.add_style alignment: {wrap_text: true}
diff --git a/app/views/admin/booths/_confirmed_booths.xlsx.axlsx b/app/views/admin/booths/_confirmed_booths.xlsx.axlsx
index 2dc10013..4d119fae 100644
--- a/app/views/admin/booths/_confirmed_booths.xlsx.axlsx
+++ b/app/views/admin/booths/_confirmed_booths.xlsx.axlsx
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb.add_worksheet(name: 'all booths') do |sheet|
   bold_style = wb.styles.add_style(b: true)
   wrap_text = wb.styles.add_style alignment: {wrap_text: true}
diff --git a/app/views/admin/booths/booths.xlsx.axlsx b/app/views/admin/booths/booths.xlsx.axlsx
index 5fe084db..33d16e72 100644
--- a/app/views/admin/booths/booths.xlsx.axlsx
+++ b/app/views/admin/booths/booths.xlsx.axlsx
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb = xlsx_package.workbook
 xlsx_package.use_autowidth = true
 if @booth_export_option == 'confirmed'
diff --git a/app/views/admin/events/_all_events.xlsx.axlsx b/app/views/admin/events/_all_events.xlsx.axlsx
index 3197cf38..686102c5 100644
--- a/app/views/admin/events/_all_events.xlsx.axlsx
+++ b/app/views/admin/events/_all_events.xlsx.axlsx
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb.add_worksheet(name: 'all events') do |sheet|
   bold_style = wb.styles.add_style(b: true)
   wrap_text = wb.styles.add_style alignment: {wrap_text: true}
diff --git a/app/views/admin/events/_all_with_comments.xlsx.axlsx b/app/views/admin/events/_all_with_comments.xlsx.axlsx
index fd798ca5..60e038a6 100644
--- a/app/views/admin/events/_all_with_comments.xlsx.axlsx
+++ b/app/views/admin/events/_all_with_comments.xlsx.axlsx
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb.use_shared_strings = true
 wb.add_worksheet(name: 'events with comments') do |sheet|
   bold_style = wb.styles.add_style(b: true)
diff --git a/app/views/admin/events/_confirmed_events.xlsx.axlsx b/app/views/admin/events/_confirmed_events.xlsx.axlsx
index a1c8c886..bbb7ef82 100644
--- a/app/views/admin/events/_confirmed_events.xlsx.axlsx
+++ b/app/views/admin/events/_confirmed_events.xlsx.axlsx
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb.add_worksheet(name: 'confirmed events') do |sheet|
   bold_style = wb.styles.add_style(b: true)
   wrap_text = wb.styles.add_style alignment: {wrap_text: true}
diff --git a/app/views/admin/events/events.xlsx.axlsx b/app/views/admin/events/events.xlsx.axlsx
index abfd1365..7b8b1dc4 100644
--- a/app/views/admin/events/events.xlsx.axlsx
+++ b/app/views/admin/events/events.xlsx.axlsx
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb = xlsx_package.workbook
 if @event_export_option == 'confirmed'
   render partial: 'confirmed_events', locals: {:wb => wb}
diff --git a/app/views/admin/registrations/index.xlsx.axlsx b/app/views/admin/registrations/index.xlsx.axlsx
index babc24ef..ee49eb4d 100644
--- a/app/views/admin/registrations/index.xlsx.axlsx
+++ b/app/views/admin/registrations/index.xlsx.axlsx
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb = xlsx_package.workbook
 wb.add_worksheet(name: 'registrations') do |sheet|
   bold_style = wb.styles.add_style(b: true)
diff --git a/app/views/admin/tracks/_all_tracks.xlsx.axlsx b/app/views/admin/tracks/_all_tracks.xlsx.axlsx
index d1397193..1b9566a5 100644
--- a/app/views/admin/tracks/_all_tracks.xlsx.axlsx
+++ b/app/views/admin/tracks/_all_tracks.xlsx.axlsx
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb.add_worksheet(name: 'all tracks') do |sheet|
   bold_style = wb.styles.add_style(b: true)
   wrap_text = wb.styles.add_style alignment: {wrap_text: true}
diff --git a/app/views/admin/tracks/_confirmed_tracks.xlsx.axlsx b/app/views/admin/tracks/_confirmed_tracks.xlsx.axlsx
index 673b985c..1cb77318 100644
--- a/app/views/admin/tracks/_confirmed_tracks.xlsx.axlsx
+++ b/app/views/admin/tracks/_confirmed_tracks.xlsx.axlsx
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb.add_worksheet(name: 'all tracks') do |sheet|
   bold_style = wb.styles.add_style(b: true)
   wrap_text = wb.styles.add_style alignment: {wrap_text: true}
diff --git a/app/views/admin/tracks/tracks.xlsx.axlsx b/app/views/admin/tracks/tracks.xlsx.axlsx
index 6a84da9b..f90b6005 100644
--- a/app/views/admin/tracks/tracks.xlsx.axlsx
+++ b/app/views/admin/tracks/tracks.xlsx.axlsx
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb = xlsx_package.workbook
 if @track_export_option == 'confirmed'
   render partial: 'confirmed_tracks', locals: { wb: wb }
diff --git a/db/migrate/20180316185150_add_code_of_conduct_to_organization.rb b/db/migrate/20180316185150_add_code_of_conduct_to_organization.rb
index 447e0c84..545900a3 100644
--- a/db/migrate/20180316185150_add_code_of_conduct_to_organization.rb
+++ b/db/migrate/20180316185150_add_code_of_conduct_to_organization.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddCodeOfConductToOrganization < ActiveRecord::Migration[5.0]
   def change
     add_column :organizations, :code_of_conduct, :text
diff --git a/db/migrate/20180316220446_add_accepted_code_of_conduct_to_registrations.rb b/db/migrate/20180316220446_add_accepted_code_of_conduct_to_registrations.rb
index fb5f043b..c100037e 100644
--- a/db/migrate/20180316220446_add_accepted_code_of_conduct_to_registrations.rb
+++ b/db/migrate/20180316220446_add_accepted_code_of_conduct_to_registrations.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddAcceptedCodeOfConductToRegistrations < ActiveRecord::Migration[5.0]
   def change
     add_column :registrations, :accepted_code_of_conduct, :boolean
diff --git a/spec/features/code_of_conduct_spec.rb b/spec/features/code_of_conduct_spec.rb
index 7ce27ce5..df6b7782 100644
--- a/spec/features/code_of_conduct_spec.rb
+++ b/spec/features/code_of_conduct_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 feature 'Code of Conduct:' do