diff --git a/app/controllers/reviewable_claimed_topics_controller.rb b/app/controllers/reviewable_claimed_topics_controller.rb
index 948558c8323..eb8b0d712b5 100644
--- a/app/controllers/reviewable_claimed_topics_controller.rb
+++ b/app/controllers/reviewable_claimed_topics_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ReviewableClaimedTopicsController < ApplicationController
   requires_login
 
diff --git a/app/jobs/regular/notify_post_revision.rb b/app/jobs/regular/notify_post_revision.rb
index b0b0794685f..b7e5c184dc9 100644
--- a/app/jobs/regular/notify_post_revision.rb
+++ b/app/jobs/regular/notify_post_revision.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Jobs
   class NotifyPostRevision < Jobs::Base
     def execute(args)
diff --git a/app/jobs/scheduled/reviewable_priorities.rb b/app/jobs/scheduled/reviewable_priorities.rb
index 00159f76fa6..7ba3fc3ee97 100644
--- a/app/jobs/scheduled/reviewable_priorities.rb
+++ b/app/jobs/scheduled/reviewable_priorities.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Jobs::ReviewablePriorities < Jobs::Scheduled
   every 1.day
 
diff --git a/app/models/reviewable_claimed_topic.rb b/app/models/reviewable_claimed_topic.rb
index ab73670cf76..d291b6cd457 100644
--- a/app/models/reviewable_claimed_topic.rb
+++ b/app/models/reviewable_claimed_topic.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ReviewableClaimedTopic < ActiveRecord::Base
   belongs_to :topic
   belongs_to :user
diff --git a/db/migrate/20190426011148_add_upload_foreign_keys_to_user_profiles.rb b/db/migrate/20190426011148_add_upload_foreign_keys_to_user_profiles.rb
index 2c6d78f782b..c0918769b2f 100644
--- a/db/migrate/20190426011148_add_upload_foreign_keys_to_user_profiles.rb
+++ b/db/migrate/20190426011148_add_upload_foreign_keys_to_user_profiles.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'migration/column_dropper'
 
 class AddUploadForeignKeysToUserProfiles < ActiveRecord::Migration[5.2]
diff --git a/db/migrate/20190502223613_add_bounce_key_index_on_email_logs.rb b/db/migrate/20190502223613_add_bounce_key_index_on_email_logs.rb
index c0c66f59c0d..83ccf913d27 100644
--- a/db/migrate/20190502223613_add_bounce_key_index_on_email_logs.rb
+++ b/db/migrate/20190502223613_add_bounce_key_index_on_email_logs.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddBounceKeyIndexOnEmailLogs < ActiveRecord::Migration[5.2]
   def change
     add_index :email_logs, [:bounce_key], unique: true, where: 'bounce_key IS NOT NULL'
diff --git a/db/migrate/20190503180839_remove_like_count_from_post_menu.rb b/db/migrate/20190503180839_remove_like_count_from_post_menu.rb
index 84b0d12bdbd..454d22ac589 100644
--- a/db/migrate/20190503180839_remove_like_count_from_post_menu.rb
+++ b/db/migrate/20190503180839_remove_like_count_from_post_menu.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RemoveLikeCountFromPostMenu < ActiveRecord::Migration[5.2]
   def up
     execute(<<~SQL)
diff --git a/db/migrate/20190508135348_rename_site_setting_default_topics.rb b/db/migrate/20190508135348_rename_site_setting_default_topics.rb
index c615dc888d5..fbd5e58bbf0 100644
--- a/db/migrate/20190508135348_rename_site_setting_default_topics.rb
+++ b/db/migrate/20190508135348_rename_site_setting_default_topics.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RenameSiteSettingDefaultTopics < ActiveRecord::Migration[5.2]
   def up
     execute "UPDATE site_settings SET name = 'reviewable_default_topics' WHERE name = 'flags_default_topics'"
diff --git a/db/migrate/20190508141327_create_reviewable_claimed_topics.rb b/db/migrate/20190508141327_create_reviewable_claimed_topics.rb
index 72f049ba2be..fd95ba6aefe 100644
--- a/db/migrate/20190508141327_create_reviewable_claimed_topics.rb
+++ b/db/migrate/20190508141327_create_reviewable_claimed_topics.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateReviewableClaimedTopics < ActiveRecord::Migration[5.2]
   def change
     create_table :reviewable_claimed_topics do |t|
diff --git a/db/migrate/20190508193900_add_missing_uploads_ignored_index_to_post_custom_fields.rb b/db/migrate/20190508193900_add_missing_uploads_ignored_index_to_post_custom_fields.rb
index 2672e171a3b..1f6978225c0 100644
--- a/db/migrate/20190508193900_add_missing_uploads_ignored_index_to_post_custom_fields.rb
+++ b/db/migrate/20190508193900_add_missing_uploads_ignored_index_to_post_custom_fields.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddMissingUploadsIgnoredIndexToPostCustomFields < ActiveRecord::Migration[5.2]
   def change
     add_index :post_custom_fields, :post_id, unique: true, where: "name = 'missing uploads ignored'", name: "index_post_id_where_missing_uploads_ignored"
diff --git a/db/post_migrate/20190508141824_drop_claimed_by_id.rb b/db/post_migrate/20190508141824_drop_claimed_by_id.rb
index 7e0630348ec..ed9bca6975a 100644
--- a/db/post_migrate/20190508141824_drop_claimed_by_id.rb
+++ b/db/post_migrate/20190508141824_drop_claimed_by_id.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DropClaimedById < ActiveRecord::Migration[5.2]
   def up
     remove_column :reviewables, :claimed_by_id
diff --git a/lib/tasks/groups.rake b/lib/tasks/groups.rake
index 6dbfac4a9d9..242ecbb16ef 100644
--- a/lib/tasks/groups.rake
+++ b/lib/tasks/groups.rake
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # bulk grant badge to members of a specific group
 task "groups:grant_badge", [:group_id, :badge_id] => [:environment] do |_, args|
   group_id = args[:group_id]
diff --git a/spec/jobs/reviewable_priorities_spec.rb b/spec/jobs/reviewable_priorities_spec.rb
index ea76400fa8b..a1f60f13101 100644
--- a/spec/jobs/reviewable_priorities_spec.rb
+++ b/spec/jobs/reviewable_priorities_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails_helper'
 
 describe Jobs::ReviewablePriorities do
diff --git a/spec/models/reviewable_claimed_topic_spec.rb b/spec/models/reviewable_claimed_topic_spec.rb
index 09cef31b918..e8801e7f13c 100644
--- a/spec/models/reviewable_claimed_topic_spec.rb
+++ b/spec/models/reviewable_claimed_topic_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails_helper'
 
 RSpec.describe ReviewableClaimedTopic, type: :model do