diff --git a/Gemfile b/Gemfile
index 4c58772c..b4a0967b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 source 'https://rubygems.org'
 ruby '2.3.0'
 
diff --git a/Rakefile b/Rakefile
index 30cf58f5..74eb42c7 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,4 +1,5 @@
 #!/usr/bin/env rake
+# frozen_string_literal: true
 # Add your own tasks in files placed in lib/tasks ending in .rake,
 # for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
 
diff --git a/Vagrantfile b/Vagrantfile
index 52e040cf..0fa3e8da 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # -*- mode: ruby -*-
 # vi: set ft=ruby :
 
@@ -31,7 +32,7 @@ sudo -u postgres psql -c "ALTER USER postgres WITH PASSWORD '3112';"
 
 SCRIPT
 
-VAGRANTFILE_API_VERSION = '2'.freeze
+VAGRANTFILE_API_VERSION = '2'
 
 Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
   config.vm.box = 'trusty64'
diff --git a/app/controllers/api/v1/deprecated_controller.rb b/app/controllers/api/v1/deprecated_controller.rb
index ed68b897..6f6b5f15 100644
--- a/app/controllers/api/v1/deprecated_controller.rb
+++ b/app/controllers/api/v1/deprecated_controller.rb
@@ -1,8 +1,9 @@
+# frozen_string_literal: true
 module Api
   module V1
     class DeprecatedController < ApplicationController
       def method_missing
-        render json: { error: "/api/v1 is deprecated! Please use /api/v2 instead." }
+        render json: { error: '/api/v1 is deprecated! Please use /api/v2 instead.' }
       end
     end
   end
diff --git a/app/controllers/api/v1/mappings_controller.rb b/app/controllers/api/v1/mappings_controller.rb
index 35c7d6bd..8ba6e704 100644
--- a/app/controllers/api/v1/mappings_controller.rb
+++ b/app/controllers/api/v1/mappings_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V1
     class MappingsController < DeprecatedController
diff --git a/app/controllers/api/v1/maps_controller.rb b/app/controllers/api/v1/maps_controller.rb
index 056810f1..0ff6f472 100644
--- a/app/controllers/api/v1/maps_controller.rb
+++ b/app/controllers/api/v1/maps_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V1
     class MapsController < DeprecatedController
diff --git a/app/controllers/api/v1/synapses_controller.rb b/app/controllers/api/v1/synapses_controller.rb
index e2111e95..32522e52 100644
--- a/app/controllers/api/v1/synapses_controller.rb
+++ b/app/controllers/api/v1/synapses_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V1
     class SynapsesController < DeprecatedController
diff --git a/app/controllers/api/v1/tokens_controller.rb b/app/controllers/api/v1/tokens_controller.rb
index c96b1065..9df2094a 100644
--- a/app/controllers/api/v1/tokens_controller.rb
+++ b/app/controllers/api/v1/tokens_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V1
     class TokensController < DeprecatedController
diff --git a/app/controllers/api/v1/topics_controller.rb b/app/controllers/api/v1/topics_controller.rb
index e974fff3..d316bfa8 100644
--- a/app/controllers/api/v1/topics_controller.rb
+++ b/app/controllers/api/v1/topics_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V1
     class TopicsController < DeprecatedController
diff --git a/app/controllers/api/v2/mappings_controller.rb b/app/controllers/api/v2/mappings_controller.rb
index 7f0d9513..86aba865 100644
--- a/app/controllers/api/v2/mappings_controller.rb
+++ b/app/controllers/api/v2/mappings_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V2
     class MappingsController < RestfulController
diff --git a/app/controllers/api/v2/maps_controller.rb b/app/controllers/api/v2/maps_controller.rb
index fd54fa7b..0bcd9bee 100644
--- a/app/controllers/api/v2/maps_controller.rb
+++ b/app/controllers/api/v2/maps_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V2
     class MapsController < RestfulController
diff --git a/app/controllers/api/v2/restful_controller.rb b/app/controllers/api/v2/restful_controller.rb
index de86dafd..d7a1856e 100644
--- a/app/controllers/api/v2/restful_controller.rb
+++ b/app/controllers/api/v2/restful_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V2
     class RestfulController < ActionController::Base
@@ -101,9 +102,9 @@ module Api
         next_page = current_page < total_pages ? current_page + 1 : 0
 
         base_url = request.base_url + request.path
-        nxt = request.query_parameters.merge(page: next_page).map{|x| x.join('=')}.join('&')
-        prev = request.query_parameters.merge(page: prev_page).map{|x| x.join('=')}.join('&')
-        last = request.query_parameters.merge(page: total_pages).map{|x| x.join('=')}.join('&')
+        nxt = request.query_parameters.merge(page: next_page).map { |x| x.join('=') }.join('&')
+        prev = request.query_parameters.merge(page: prev_page).map { |x| x.join('=') }.join('&')
+        last = request.query_parameters.merge(page: total_pages).map { |x| x.join('=') }.join('&')
         response.headers['Link'] = [
           %(<#{base_url}?#{nxt}>; rel="next"),
           %(<#{base_url}?#{prev}>; rel="prev"),
@@ -163,7 +164,7 @@ module Api
             builder = builder.order(sort => direction)
           end
         end
-        return builder
+        builder
       end
 
       def visible_records
diff --git a/app/controllers/api/v2/sessions_controller.rb b/app/controllers/api/v2/sessions_controller.rb
index 3aefa214..2aa93669 100644
--- a/app/controllers/api/v2/sessions_controller.rb
+++ b/app/controllers/api/v2/sessions_controller.rb
@@ -1,9 +1,10 @@
+# frozen_string_literal: true
 module Api
   module V2
     class SessionsController < ApplicationController
       def create
         @user = User.find_by(email: params[:email])
-        if @user && @user.valid_password(params[:password])
+        if @user&.valid_password(params[:password])
           sign_in(@user)
           render json: @user
         else
diff --git a/app/controllers/api/v2/synapses_controller.rb b/app/controllers/api/v2/synapses_controller.rb
index 6572997d..6484699e 100644
--- a/app/controllers/api/v2/synapses_controller.rb
+++ b/app/controllers/api/v2/synapses_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V2
     class SynapsesController < RestfulController
diff --git a/app/controllers/api/v2/tokens_controller.rb b/app/controllers/api/v2/tokens_controller.rb
index 6eeb102b..d1a6b255 100644
--- a/app/controllers/api/v2/tokens_controller.rb
+++ b/app/controllers/api/v2/tokens_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V2
     class TokensController < RestfulController
diff --git a/app/controllers/api/v2/topics_controller.rb b/app/controllers/api/v2/topics_controller.rb
index 74fa7105..22e534ce 100644
--- a/app/controllers/api/v2/topics_controller.rb
+++ b/app/controllers/api/v2/topics_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V2
     class TopicsController < RestfulController
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 58c996c5..7735c681 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ApplicationController < ActionController::Base
   include ApplicationHelper
   include Pundit
@@ -60,10 +61,9 @@ class ApplicationController < ActionController::Base
   end
 
   def require_admin
-    unless authenticated? && admin?
-      redirect_to root_url, notice: 'You need to be an admin for that.'
-      return false
-    end
+    return true if authenticated? && admin?
+    redirect_to root_url, notice: 'You need to be an admin for that.'
+    false
   end
 
   def user
diff --git a/app/controllers/main_controller.rb b/app/controllers/main_controller.rb
index 01304328..0d6af64b 100644
--- a/app/controllers/main_controller.rb
+++ b/app/controllers/main_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MainController < ApplicationController
   include TopicsHelper
   include MapsHelper
@@ -12,13 +13,13 @@ class MainController < ApplicationController
   def home
     @maps = policy_scope(Map).order('updated_at DESC').page(1).per(20)
     respond_to do |format|
-        format.html { 
-          if !authenticated?
-            render 'main/home'
-          else 
-            render 'maps/activemaps'
-          end
-        }
+      format.html do
+        if !authenticated?
+          render 'main/home'
+        else
+          render 'maps/activemaps'
+        end
+      end
     end
   end
 
@@ -163,8 +164,8 @@ class MainController < ApplicationController
       @synapses = []
     end
 
-    #limit to 5 results
-    @synapses = @synapses.to_a.slice(0,5)
+    # limit to 5 results
+    @synapses = @synapses.to_a.slice(0, 5)
 
     render json: autocomplete_synapse_array_json(@synapses)
   end
diff --git a/app/controllers/mappings_controller.rb b/app/controllers/mappings_controller.rb
index 3d162c0f..de2c8ea1 100644
--- a/app/controllers/mappings_controller.rb
+++ b/app/controllers/mappings_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MappingsController < ApplicationController
   before_action :require_user, only: [:create, :update, :destroy]
   after_action :verify_authorized, except: :index
diff --git a/app/controllers/maps_controller.rb b/app/controllers/maps_controller.rb
index 7c4a74a7..8e7b4136 100644
--- a/app/controllers/maps_controller.rb
+++ b/app/controllers/maps_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MapsController < ApplicationController
   before_action :require_user, only: [:create, :update, :access, :star, :unstar, :screenshot, :events, :destroy]
   after_action :verify_authorized, except: [:activemaps, :featuredmaps, :mymaps, :sharedmaps, :starredmaps, :usermaps]
@@ -107,14 +108,14 @@ class MapsController < ApplicationController
 
   # GET maps/new
   def new
-    @map = Map.new(name: "Untitled Map", permission: "public", arranged: true)
+    @map = Map.new(name: 'Untitled Map', permission: 'public', arranged: true)
     authorize @map
 
     respond_to do |format|
       format.html do
         @map.user = current_user
         @map.save
-        redirect_to(map_path(@map) + '?new') 
+        redirect_to(map_path(@map) + '?new')
       end
     end
   end
@@ -305,9 +306,7 @@ class MapsController < ApplicationController
     @map = Map.find(params[:id])
     authorize @map
     star = Star.find_by_map_id_and_user_id(@map.id, current_user.id)
-    if not star
-      star = Star.create(map_id: @map.id, user_id: current_user.id)
-    end
+    star = Star.create(map_id: @map.id, user_id: current_user.id) unless star
 
     respond_to do |format|
       format.json do
@@ -321,9 +320,7 @@ class MapsController < ApplicationController
     @map = Map.find(params[:id])
     authorize @map
     star = Star.find_by_map_id_and_user_id(@map.id, current_user.id)
-    if star
-      star.delete
-    end
+    star&.delete
 
     respond_to do |format|
       format.json do
diff --git a/app/controllers/messages_controller.rb b/app/controllers/messages_controller.rb
index ec59a2a4..dd3544e9 100644
--- a/app/controllers/messages_controller.rb
+++ b/app/controllers/messages_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MessagesController < ApplicationController
   before_action :require_user, except: [:show]
   after_action :verify_authorized
diff --git a/app/controllers/metacode_sets_controller.rb b/app/controllers/metacode_sets_controller.rb
index a57c557f..8fec58cc 100644
--- a/app/controllers/metacode_sets_controller.rb
+++ b/app/controllers/metacode_sets_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MetacodeSetsController < ApplicationController
   before_action :require_admin
 
diff --git a/app/controllers/synapses_controller.rb b/app/controllers/synapses_controller.rb
index ddb3e5ab..8fc31688 100644
--- a/app/controllers/synapses_controller.rb
+++ b/app/controllers/synapses_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class SynapsesController < ApplicationController
   include TopicsHelper
 
diff --git a/app/controllers/topics_controller.rb b/app/controllers/topics_controller.rb
index 30ac57fd..1b966ca2 100644
--- a/app/controllers/topics_controller.rb
+++ b/app/controllers/topics_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class TopicsController < ApplicationController
   include TopicsHelper
 
diff --git a/app/controllers/users/passwords_controller.rb b/app/controllers/users/passwords_controller.rb
index ee7b8667..bffe3ab6 100644
--- a/app/controllers/users/passwords_controller.rb
+++ b/app/controllers/users/passwords_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Users::PasswordsController < Devise::PasswordsController
   protected
 
@@ -5,7 +6,7 @@ class Users::PasswordsController < Devise::PasswordsController
     signed_in_root_path(resource)
   end
 
-  def after_sending_reset_password_instructions_path_for(resource_name)
+  def after_sending_reset_password_instructions_path_for(_resource_name)
     new_user_session_path if is_navigational_format?
   end
 end
diff --git a/app/controllers/users/registrations_controller.rb b/app/controllers/users/registrations_controller.rb
index 8895cfd2..21cd9666 100644
--- a/app/controllers/users/registrations_controller.rb
+++ b/app/controllers/users/registrations_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Users::RegistrationsController < Devise::RegistrationsController
   before_action :configure_sign_up_params, only: [:create]
   before_action :configure_account_update_params, only: [:update]
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 0ea95211..a9fff9de 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class UsersController < ApplicationController
   before_action :require_user, only: [:edit, :update, :updatemetacodes]
 
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 555a32d2..57b24106 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ApplicationHelper
   def get_metacodeset
     @m = current_user.settings.metacodes
diff --git a/app/helpers/content_helper.rb b/app/helpers/content_helper.rb
index 4a8820f0..4fb2fe84 100644
--- a/app/helpers/content_helper.rb
+++ b/app/helpers/content_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ContentHelper
   def resource_name
     :user
diff --git a/app/helpers/devise_helper.rb b/app/helpers/devise_helper.rb
index 5081cba0..4b34effc 100644
--- a/app/helpers/devise_helper.rb
+++ b/app/helpers/devise_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module DeviseHelper
   def devise_error_messages!
     resource.errors.to_a[0]
diff --git a/app/helpers/in_metacode_sets_helper.rb b/app/helpers/in_metacode_sets_helper.rb
index 52a47cdc..0c45fd98 100644
--- a/app/helpers/in_metacode_sets_helper.rb
+++ b/app/helpers/in_metacode_sets_helper.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 module InMetacodeSetsHelper
 end
diff --git a/app/helpers/main_helper.rb b/app/helpers/main_helper.rb
index 826effed..33378f43 100644
--- a/app/helpers/main_helper.rb
+++ b/app/helpers/main_helper.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 module MainHelper
 end
diff --git a/app/helpers/mapping_helper.rb b/app/helpers/mapping_helper.rb
index 7055739f..9dd903ca 100644
--- a/app/helpers/mapping_helper.rb
+++ b/app/helpers/mapping_helper.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 module MappingHelper
 end
diff --git a/app/helpers/maps_helper.rb b/app/helpers/maps_helper.rb
index 3f60fe4d..8ca7b047 100644
--- a/app/helpers/maps_helper.rb
+++ b/app/helpers/maps_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module MapsHelper
   ## this one is for building our custom JSON autocomplete format for typeahead
   def autocomplete_map_array_json(maps)
@@ -16,7 +17,7 @@ module MapsHelper
 
       contributorTip = ''
       firstContributorImage = 'https://s3.amazonaws.com/metamaps-assets/site/user.png'
-      if m.contributors.count > 0
+      if m.contributors.count.positive?
         firstContributorImage = m.contributors[0].image.url(:thirtytwo)
         m.contributors.each_with_index do |c, _index|
           userImage = c.image.url(:thirtytwo)
diff --git a/app/helpers/metacode_sets_helper.rb b/app/helpers/metacode_sets_helper.rb
index 668ceb5c..9a6e09c7 100644
--- a/app/helpers/metacode_sets_helper.rb
+++ b/app/helpers/metacode_sets_helper.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 module MetacodeSetsHelper
 end
diff --git a/app/helpers/metacodes_helper.rb b/app/helpers/metacodes_helper.rb
index c896d26d..d00f1ef5 100644
--- a/app/helpers/metacodes_helper.rb
+++ b/app/helpers/metacodes_helper.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 module MetacodesHelper
 end
diff --git a/app/helpers/synapses_helper.rb b/app/helpers/synapses_helper.rb
index 470292e5..471f0e05 100644
--- a/app/helpers/synapses_helper.rb
+++ b/app/helpers/synapses_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module SynapsesHelper
   ## this one is for building our custom JSON autocomplete format for typeahead
   def autocomplete_synapse_generic_json(unique)
diff --git a/app/helpers/topics_helper.rb b/app/helpers/topics_helper.rb
index bb589e9a..32697db5 100644
--- a/app/helpers/topics_helper.rb
+++ b/app/helpers/topics_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module TopicsHelper
   ## this one is for building our custom JSON autocomplete format for typeahead
   def autocomplete_array_json(topics)
@@ -7,7 +8,7 @@ module TopicsHelper
       topic['id'] = t.id
       topic['label'] = t.name
       topic['value'] = t.name
-      topic['description'] = t.desc ? t.desc.truncate(70) : '' # make this return matched results
+      topic['description'] = t.desc ? t.desc&.truncate(70) # make this return matched results
       topic['type'] = t.metacode.name
       topic['typeImageURL'] = t.metacode.icon
       topic['permission'] = t.permission
@@ -34,7 +35,7 @@ module TopicsHelper
     # add the node to the array
     array.push(node)
 
-    return array if count == 0
+    return array if count.zero?
 
     count -= 1
 
diff --git a/app/helpers/users_helper.rb b/app/helpers/users_helper.rb
index 8144dfd8..379cf20a 100644
--- a/app/helpers/users_helper.rb
+++ b/app/helpers/users_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module UsersHelper
   # build custom json autocomplete for typeahead
   def autocomplete_user_array_json(users)
diff --git a/app/mailers/application_mailer.rb b/app/mailers/application_mailer.rb
index d934e218..59a2175a 100644
--- a/app/mailers/application_mailer.rb
+++ b/app/mailers/application_mailer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ApplicationMailer < ActionMailer::Base
   default from: 'team@metamaps.cc'
   layout 'mailer'
diff --git a/app/mailers/map_mailer.rb b/app/mailers/map_mailer.rb
index 94e8ebd5..e70d0b82 100644
--- a/app/mailers/map_mailer.rb
+++ b/app/mailers/map_mailer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MapMailer < ApplicationMailer
   default from: 'team@metamaps.cc'
 
diff --git a/app/models/application_record.rb b/app/models/application_record.rb
index 10a4cba8..767a072b 100644
--- a/app/models/application_record.rb
+++ b/app/models/application_record.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
 end
diff --git a/app/models/concerns/routing.rb b/app/models/concerns/routing.rb
index 2f8467bf..ddbfad6f 100644
--- a/app/models/concerns/routing.rb
+++ b/app/models/concerns/routing.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Routing
   extend ActiveSupport::Concern
   include Rails.application.routes.url_helpers
diff --git a/app/models/event.rb b/app/models/event.rb
index 90407314..02c6d698 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Event < ApplicationRecord
   KINDS = %w(user_present_on_map conversation_started_on_map topic_added_to_map synapse_added_to_map).freeze
 
diff --git a/app/models/events/conversation_started_on_map.rb b/app/models/events/conversation_started_on_map.rb
index 4ca922be..20fb89c1 100644
--- a/app/models/events/conversation_started_on_map.rb
+++ b/app/models/events/conversation_started_on_map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Events::ConversationStartedOnMap < Event
   # after_create :notify_users!
 
diff --git a/app/models/events/new_mapping.rb b/app/models/events/new_mapping.rb
index d7b91576..889c69bc 100644
--- a/app/models/events/new_mapping.rb
+++ b/app/models/events/new_mapping.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Events::NewMapping < Event
   # after_create :notify_users!
 
diff --git a/app/models/events/user_present_on_map.rb b/app/models/events/user_present_on_map.rb
index 45726002..38d524ef 100644
--- a/app/models/events/user_present_on_map.rb
+++ b/app/models/events/user_present_on_map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Events::UserPresentOnMap < Event
   # after_create :notify_users!
 
diff --git a/app/models/in_metacode_set.rb b/app/models/in_metacode_set.rb
index de1f2514..78dc1c29 100644
--- a/app/models/in_metacode_set.rb
+++ b/app/models/in_metacode_set.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class InMetacodeSet < ApplicationRecord
   belongs_to :metacode, class_name: 'Metacode', foreign_key: 'metacode_id'
   belongs_to :metacode_set, class_name: 'MetacodeSet', foreign_key: 'metacode_set_id'
diff --git a/app/models/map.rb b/app/models/map.rb
index f59eb790..9c30479f 100644
--- a/app/models/map.rb
+++ b/app/models/map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Map < ApplicationRecord
   belongs_to :user
 
@@ -19,7 +20,7 @@ class Map < ApplicationRecord
     thumb: ['188x126#', :png]
     #:full => ['940x630#', :png]
   },
-  default_url: 'https://s3.amazonaws.com/metamaps-assets/site/missing-map-white.png'
+                                 default_url: 'https://s3.amazonaws.com/metamaps-assets/site/missing-map-white.png'
 
   validates :name, presence: true
   validates :arranged, inclusion: { in: [true, false] }
diff --git a/app/models/mapping.rb b/app/models/mapping.rb
index eba7a6d2..f7219008 100644
--- a/app/models/mapping.rb
+++ b/app/models/mapping.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Mapping < ApplicationRecord
   scope :topicmapping, -> { where(mappable_type: :Topic) }
   scope :synapsemapping, -> { where(mappable_type: :Synapse) }
diff --git a/app/models/message.rb b/app/models/message.rb
index 348c5d4e..682b7e51 100644
--- a/app/models/message.rb
+++ b/app/models/message.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Message < ApplicationRecord
   belongs_to :user
   belongs_to :resource, polymorphic: true
diff --git a/app/models/metacode.rb b/app/models/metacode.rb
index 9b05bee5..c97c4fb5 100644
--- a/app/models/metacode.rb
+++ b/app/models/metacode.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Metacode < ApplicationRecord
   has_many :in_metacode_sets
   has_many :metacode_sets, through: :in_metacode_sets
diff --git a/app/models/metacode_set.rb b/app/models/metacode_set.rb
index c52811fd..72bcc719 100644
--- a/app/models/metacode_set.rb
+++ b/app/models/metacode_set.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MetacodeSet < ApplicationRecord
   belongs_to :user
   has_many :in_metacode_sets
diff --git a/app/models/permitted_params.rb b/app/models/permitted_params.rb
index 0ccea1c8..d0696985 100644
--- a/app/models/permitted_params.rb
+++ b/app/models/permitted_params.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class PermittedParams < Struct.new(:params)
   %w(map synapse topic mapping token).each do |kind|
     define_method(kind) do
diff --git a/app/models/star.rb b/app/models/star.rb
index 52a77044..dcaaa559 100644
--- a/app/models/star.rb
+++ b/app/models/star.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Star < ActiveRecord::Base
   belongs_to :user
   belongs_to :map
diff --git a/app/models/synapse.rb b/app/models/synapse.rb
index afd40a25..c7161469 100644
--- a/app/models/synapse.rb
+++ b/app/models/synapse.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Synapse < ApplicationRecord
   belongs_to :user
   belongs_to :defer_to_map, class_name: 'Map', foreign_key: 'defer_to_map_id'
@@ -44,10 +45,7 @@ class Synapse < ApplicationRecord
   # :nocov:
   def calculated_permission
     if defer_to_map
-      defer_to_map.permission
-    else
-      permission
-    end
+      defer_to_map&.permission
   end
   # :nocov:
 
diff --git a/app/models/token.rb b/app/models/token.rb
index 9103aebc..9cd93043 100644
--- a/app/models/token.rb
+++ b/app/models/token.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Token < ApplicationRecord
   belongs_to :user
 
diff --git a/app/models/topic.rb b/app/models/topic.rb
index c250338b..09d61897 100644
--- a/app/models/topic.rb
+++ b/app/models/topic.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Topic < ApplicationRecord
   include TopicsHelper
 
@@ -74,10 +75,7 @@ class Topic < ApplicationRecord
 
   def calculated_permission
     if defer_to_map
-      defer_to_map.permission
-    else
-      permission
-    end
+      defer_to_map&.permission
   end
 
   def as_json(_options = {})
diff --git a/app/models/user.rb b/app/models/user.rb
index 876e10cd..4da66e57 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'open-uri'
 
 class User < ApplicationRecord
@@ -41,7 +42,7 @@ class User < ApplicationRecord
                             default_url: 'https://s3.amazonaws.com/metamaps-assets/site/user.png'
 
   # Validate the attached image is image/jpg, image/png, etc
-  validates_attachment_content_type :image, content_type: %r(\Aimage/.*\Z)
+  validates_attachment_content_type :image, content_type: %r{\Aimage/.*\Z}
 
   # override default as_json
   def as_json(_options = {})
@@ -79,8 +80,8 @@ class User < ApplicationRecord
     end
   end
 
-  def starred_map?(map) 
-    return self.stars.where(map_id: map.id).exists?
+  def starred_map?(map)
+    stars.where(map_id: map.id).exists?
   end
 
   def settings
diff --git a/app/models/user_map.rb b/app/models/user_map.rb
index c48cfb96..dc268047 100644
--- a/app/models/user_map.rb
+++ b/app/models/user_map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class UserMap < ApplicationRecord
   belongs_to :map
   belongs_to :user
diff --git a/app/models/user_preference.rb b/app/models/user_preference.rb
index 3aadbdb3..29ca3948 100644
--- a/app/models/user_preference.rb
+++ b/app/models/user_preference.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class UserPreference
   attr_accessor :metacodes
 
@@ -9,7 +10,7 @@ class UserPreference
         array.push(metacode.id.to_s) if metacode
       rescue ActiveRecord::StatementInvalid
         if m == 'Action'
-          Rails.logger.warn("TODO: remove this travis workaround in user_preference.rb")
+          Rails.logger.warn('TODO: remove this travis workaround in user_preference.rb')
         end
       end
     end
diff --git a/app/models/webhook.rb b/app/models/webhook.rb
index 6389398e..65057411 100644
--- a/app/models/webhook.rb
+++ b/app/models/webhook.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Webhook < ApplicationRecord
   belongs_to :hookable, polymorphic: true
 
diff --git a/app/models/webhooks/slack/base.rb b/app/models/webhooks/slack/base.rb
index 97cf1f04..960775dd 100644
--- a/app/models/webhooks/slack/base.rb
+++ b/app/models/webhooks/slack/base.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Webhooks::Slack::Base = Struct.new(:event) do
   include Routing
 
diff --git a/app/models/webhooks/slack/conversation_started_on_map.rb b/app/models/webhooks/slack/conversation_started_on_map.rb
index 5fa325d0..daf2270e 100644
--- a/app/models/webhooks/slack/conversation_started_on_map.rb
+++ b/app/models/webhooks/slack/conversation_started_on_map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Webhooks::Slack::ConversationStartedOnMap < Webhooks::Slack::Base
   def text
     "There is a live conversation starting on map *#{event.map.name}*. #{view_map_on_metamaps('Join in!')}"
diff --git a/app/models/webhooks/slack/synapse_added_to_map.rb b/app/models/webhooks/slack/synapse_added_to_map.rb
index 5dc636e1..5157afa7 100644
--- a/app/models/webhooks/slack/synapse_added_to_map.rb
+++ b/app/models/webhooks/slack/synapse_added_to_map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Webhooks::Slack::SynapseAddedToMap < Webhooks::Slack::Base
   def text
     "\"*#{eventable.mappable.topic1.name}* #{eventable.mappable.desc || '->'} *#{eventable.mappable.topic2.name}*\" was added as a connection to the map *#{view_map_on_metamaps}*"
diff --git a/app/models/webhooks/slack/topic_added_to_map.rb b/app/models/webhooks/slack/topic_added_to_map.rb
index 07a20759..d3a19760 100644
--- a/app/models/webhooks/slack/topic_added_to_map.rb
+++ b/app/models/webhooks/slack/topic_added_to_map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Webhooks::Slack::TopicAddedToMap < Webhooks::Slack::Base
   def text
     "New #{eventable.mappable.metacode.name} topic *#{eventable.mappable.name}* was added to the map *#{view_map_on_metamaps}*"
diff --git a/app/models/webhooks/slack/user_present_on_map.rb b/app/models/webhooks/slack/user_present_on_map.rb
index 666d5121..c3185e48 100644
--- a/app/models/webhooks/slack/user_present_on_map.rb
+++ b/app/models/webhooks/slack/user_present_on_map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Webhooks::Slack::UserPresentOnMap < Webhooks::Slack::Base
   def text
     "Mapper *#{event.user.name}* has joined the map *#{event.map.name}*. #{view_map_on_metamaps('Map with them')}"
diff --git a/app/policies/application_policy.rb b/app/policies/application_policy.rb
index a9835c98..348ef5f2 100644
--- a/app/policies/application_policy.rb
+++ b/app/policies/application_policy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ApplicationPolicy
   attr_reader :user, :record
 
@@ -39,7 +40,7 @@ class ApplicationPolicy
   # explicitly say they want to (E.g. seeing/editing/deleting private
   # maps - they should be able to, but not by accident)
   def admin_override
-    user && user.admin
+    user&.admin
   end
 
   def scope
diff --git a/app/policies/main_policy.rb b/app/policies/main_policy.rb
index 77ab373c..e0ffc30b 100644
--- a/app/policies/main_policy.rb
+++ b/app/policies/main_policy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MainPolicy < ApplicationPolicy
   def initialize(user, _record)
     @user = user
diff --git a/app/policies/map_policy.rb b/app/policies/map_policy.rb
index 0a2b33ce..3894520c 100644
--- a/app/policies/map_policy.rb
+++ b/app/policies/map_policy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MapPolicy < ApplicationPolicy
   class Scope < Scope
     def resolve
diff --git a/app/policies/mapping_policy.rb b/app/policies/mapping_policy.rb
index 1cd99783..efcb798b 100644
--- a/app/policies/mapping_policy.rb
+++ b/app/policies/mapping_policy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MappingPolicy < ApplicationPolicy
   class Scope < Scope
     def resolve
diff --git a/app/policies/message_policy.rb b/app/policies/message_policy.rb
index 8df6e916..f35a2895 100644
--- a/app/policies/message_policy.rb
+++ b/app/policies/message_policy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MessagePolicy < ApplicationPolicy
   class Scope < Scope
     def resolve
diff --git a/app/policies/synapse_policy.rb b/app/policies/synapse_policy.rb
index 310b3947..f9557e70 100644
--- a/app/policies/synapse_policy.rb
+++ b/app/policies/synapse_policy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class SynapsePolicy < ApplicationPolicy
   class Scope < Scope
     def resolve
diff --git a/app/policies/token_policy.rb b/app/policies/token_policy.rb
index e150fec9..cd9a5ab7 100644
--- a/app/policies/token_policy.rb
+++ b/app/policies/token_policy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class TokenPolicy < ApplicationPolicy
   class Scope < Scope
     def resolve
diff --git a/app/policies/topic_policy.rb b/app/policies/topic_policy.rb
index 7bca6770..2484ee54 100644
--- a/app/policies/topic_policy.rb
+++ b/app/policies/topic_policy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class TopicPolicy < ApplicationPolicy
   class Scope < Scope
     def resolve
diff --git a/app/serializers/api/v2/application_serializer.rb b/app/serializers/api/v2/application_serializer.rb
index f943646c..55a9b8a0 100644
--- a/app/serializers/api/v2/application_serializer.rb
+++ b/app/serializers/api/v2/application_serializer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V2
     class ApplicationSerializer < ActiveModel::Serializer
diff --git a/app/serializers/api/v2/event_serializer.rb b/app/serializers/api/v2/event_serializer.rb
index 644598cf..c875056a 100644
--- a/app/serializers/api/v2/event_serializer.rb
+++ b/app/serializers/api/v2/event_serializer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V2
     class EventSerializer < ApplicationSerializer
diff --git a/app/serializers/api/v2/map_serializer.rb b/app/serializers/api/v2/map_serializer.rb
index 438f97ee..0a0be2c0 100644
--- a/app/serializers/api/v2/map_serializer.rb
+++ b/app/serializers/api/v2/map_serializer.rb
@@ -1,13 +1,14 @@
+# frozen_string_literal: true
 module Api
   module V2
     class MapSerializer < ApplicationSerializer
       attributes :id,
-        :name,
-        :desc,
-        :permission,
-        :screenshot,
-        :created_at,
-        :updated_at
+                 :name,
+                 :desc,
+                 :permission,
+                 :screenshot,
+                 :created_at,
+                 :updated_at
 
       def self.embeddable
         {
@@ -20,7 +21,7 @@ module Api
         }
       end
 
-      self.class_eval do
+      class_eval do
         embed_dat
       end
     end
diff --git a/app/serializers/api/v2/mapping_serializer.rb b/app/serializers/api/v2/mapping_serializer.rb
index dc36421e..19e7318e 100644
--- a/app/serializers/api/v2/mapping_serializer.rb
+++ b/app/serializers/api/v2/mapping_serializer.rb
@@ -1,11 +1,12 @@
+# frozen_string_literal: true
 module Api
   module V2
     class MappingSerializer < ApplicationSerializer
       attributes :id,
-        :created_at,
-        :updated_at,
-        :mappable_id,
-        :mappable_type
+                 :created_at,
+                 :updated_at,
+                 :mappable_id,
+                 :mappable_type
 
       attribute :xloc, if: -> { object.mappable_type == 'Topic' }
       attribute :yloc, if: -> { object.mappable_type == 'Topic' }
@@ -17,7 +18,7 @@ module Api
         }
       end
 
-      self.class_eval do
+      class_eval do
         embed_dat
       end
     end
diff --git a/app/serializers/api/v2/metacode_serializer.rb b/app/serializers/api/v2/metacode_serializer.rb
index 4f4daa35..16013e33 100644
--- a/app/serializers/api/v2/metacode_serializer.rb
+++ b/app/serializers/api/v2/metacode_serializer.rb
@@ -1,11 +1,12 @@
+# frozen_string_literal: true
 module Api
   module V2
     class MetacodeSerializer < ApplicationSerializer
       attributes :id,
-        :name,
-        :manual_icon,
-        :color,
-        :aws_icon
+                 :name,
+                 :manual_icon,
+                 :color,
+                 :aws_icon
     end
   end
 end
diff --git a/app/serializers/api/v2/synapse_serializer.rb b/app/serializers/api/v2/synapse_serializer.rb
index 9ef86660..f647022c 100644
--- a/app/serializers/api/v2/synapse_serializer.rb
+++ b/app/serializers/api/v2/synapse_serializer.rb
@@ -1,12 +1,13 @@
+# frozen_string_literal: true
 module Api
   module V2
     class SynapseSerializer < ApplicationSerializer
       attributes :id,
-        :desc,
-        :category,
-        :permission,
-        :created_at,
-        :updated_at
+                 :desc,
+                 :category,
+                 :permission,
+                 :created_at,
+                 :updated_at
 
       def self.embeddable
         {
@@ -16,7 +17,7 @@ module Api
         }
       end
 
-      self.class_eval do
+      class_eval do
         embed_dat
       end
     end
diff --git a/app/serializers/api/v2/token_serializer.rb b/app/serializers/api/v2/token_serializer.rb
index 18d15d15..8f86757b 100644
--- a/app/serializers/api/v2/token_serializer.rb
+++ b/app/serializers/api/v2/token_serializer.rb
@@ -1,10 +1,11 @@
+# frozen_string_literal: true
 module Api
   module V2
     class TokenSerializer < ApplicationSerializer
       attributes :id,
-        :token,
-        :description,
-        :created_at
+                 :token,
+                 :description,
+                 :created_at
     end
   end
 end
diff --git a/app/serializers/api/v2/topic_serializer.rb b/app/serializers/api/v2/topic_serializer.rb
index 48d1d6de..8da46a2a 100644
--- a/app/serializers/api/v2/topic_serializer.rb
+++ b/app/serializers/api/v2/topic_serializer.rb
@@ -1,13 +1,14 @@
+# frozen_string_literal: true
 module Api
   module V2
     class TopicSerializer < ApplicationSerializer
       attributes :id,
-        :name,
-        :desc,
-        :link,
-        :permission,
-        :created_at,
-        :updated_at
+                 :name,
+                 :desc,
+                 :link,
+                 :permission,
+                 :created_at,
+                 :updated_at
 
       def self.embeddable
         {
@@ -16,7 +17,7 @@ module Api
         }
       end
 
-      self.class_eval do
+      class_eval do
         embed_dat
       end
     end
diff --git a/app/serializers/api/v2/user_serializer.rb b/app/serializers/api/v2/user_serializer.rb
index fdfffae0..e97bc420 100644
--- a/app/serializers/api/v2/user_serializer.rb
+++ b/app/serializers/api/v2/user_serializer.rb
@@ -1,11 +1,12 @@
+# frozen_string_literal: true
 module Api
   module V2
     class UserSerializer < ApplicationSerializer
       attributes :id,
-        :name,
-        :avatar,
-        :is_admin,
-        :generation
+                 :name,
+                 :avatar,
+                 :is_admin,
+                 :generation
 
       def avatar
         object.image.url(:sixtyfour)
diff --git a/app/serializers/api/v2/webhook_serializer.rb b/app/serializers/api/v2/webhook_serializer.rb
index 59d60283..3221e450 100644
--- a/app/serializers/api/v2/webhook_serializer.rb
+++ b/app/serializers/api/v2/webhook_serializer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Api
   module V2
     class WebhookSerializer < ApplicationSerializer
diff --git a/app/services/map_export_service.rb b/app/services/map_export_service.rb
index c52b0802..bd256140 100644
--- a/app/services/map_export_service.rb
+++ b/app/services/map_export_service.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class MapExportService < Struct.new(:user, :map)
   def json
     # marshal_dump turns OpenStruct into a Hash
diff --git a/app/services/perm.rb b/app/services/perm.rb
index 99897028..57e0816f 100644
--- a/app/services/perm.rb
+++ b/app/services/perm.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Perm
   # e.g. Perm::ISSIONS
   ISSIONS = [:commons, :public, :private].freeze
diff --git a/app/services/webhook_service.rb b/app/services/webhook_service.rb
index 965f2c91..0efe9392 100644
--- a/app/services/webhook_service.rb
+++ b/app/services/webhook_service.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class WebhookService
   def self.publish!(webhook:, event:)
     return false unless webhook.event_types.include? event.kind
diff --git a/config.ru b/config.ru
index 8a0f42cc..ab79c07d 100644
--- a/config.ru
+++ b/config.ru
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # This file is used by Rack-based servers to start the application.
 
 require ::File.expand_path('../config/environment', __FILE__)
diff --git a/config/application.rb b/config/application.rb
index b80306c5..b629682a 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative 'boot'
 
 require 'csv'
diff --git a/config/boot.rb b/config/boot.rb
index e49b6649..f17b883c 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rubygems'
 require 'rails/commands/server'
 
diff --git a/config/environment.rb b/config/environment.rb
index 426333bb..12ea62f8 100644
--- a/config/environment.rb
+++ b/config/environment.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Load the Rails application.
 require_relative 'application'
 
diff --git a/config/environments/development.rb b/config/environments/development.rb
index 407a30f3..b1654921 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Metamaps::Application.configure do
   # Settings specified here will take precedence over those in config/application.rb
 
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 24ceed21..f9c94af6 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb
 
diff --git a/config/environments/test.rb b/config/environments/test.rb
index dac060f1..5f0b1ee2 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Metamaps::Application.configure do
   # Settings specified here will take precedence over those in config/application.rb
 
diff --git a/config/initializers/access_codes.rb b/config/initializers/access_codes.rb
index 4a220c97..543ce6e9 100644
--- a/config/initializers/access_codes.rb
+++ b/config/initializers/access_codes.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 $codes = []
 if ActiveRecord::Base.connection.data_source_exists? 'users'
   $codes = ActiveRecord::Base.connection.execute('SELECT code FROM users').map { |user| user['code'] }
diff --git a/config/initializers/active_model_serializers.rb b/config/initializers/active_model_serializers.rb
index aba3586b..929be340 100644
--- a/config/initializers/active_model_serializers.rb
+++ b/config/initializers/active_model_serializers.rb
@@ -1 +1,2 @@
+# frozen_string_literal: true
 ActiveModelSerializers.config.adapter = :json
diff --git a/config/initializers/application_controller_renderer.rb b/config/initializers/application_controller_renderer.rb
index 51639b67..315ac48a 100644
--- a/config/initializers/application_controller_renderer.rb
+++ b/config/initializers/application_controller_renderer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # ApplicationController.renderer.defaults.merge!(
diff --git a/config/initializers/assets.rb b/config/initializers/assets.rb
index 31897cf4..4edab3b6 100644
--- a/config/initializers/assets.rb
+++ b/config/initializers/assets.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Version of your assets, change this if you want to expire all your assets.
@@ -9,4 +10,4 @@ Rails.application.config.assets.quiet = true
 
 # Precompile additional assets.
 # application.js, application.css, and all non-JS/CSS in app/assets folder are already added.
-Rails.application.config.assets.precompile += %w( webpacked/metamaps.bundle.js )
+Rails.application.config.assets.precompile += %w(webpacked/metamaps.bundle.js)
diff --git a/config/initializers/backtrace_silencers.rb b/config/initializers/backtrace_silencers.rb
index 59385cdf..d0f0d3b5 100644
--- a/config/initializers/backtrace_silencers.rb
+++ b/config/initializers/backtrace_silencers.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # You can add backtrace silencers for libraries that you're using but don't wish to see in your backtraces.
diff --git a/config/initializers/cookies_serializer.rb b/config/initializers/cookies_serializer.rb
index f51a497e..74ea9274 100644
--- a/config/initializers/cookies_serializer.rb
+++ b/config/initializers/cookies_serializer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Specify a serializer for the signed and encrypted cookie jars.
diff --git a/config/initializers/cors.rb b/config/initializers/cors.rb
index a9a8dcff..cb46d3ef 100644
--- a/config/initializers/cors.rb
+++ b/config/initializers/cors.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Rails.application.config.middleware.insert_before 0, Rack::Cors do
   allow do
     origins '*'
diff --git a/config/initializers/devise.rb b/config/initializers/devise.rb
index 8a87b3b9..a086584d 100644
--- a/config/initializers/devise.rb
+++ b/config/initializers/devise.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Use this hook to configure devise mailer, warden hooks and so forth.
 # Many of these configuration options can be set straight in your model.
 Devise.setup do |config|
diff --git a/config/initializers/doorkeeper.rb b/config/initializers/doorkeeper.rb
index 843fe831..33073f45 100644
--- a/config/initializers/doorkeeper.rb
+++ b/config/initializers/doorkeeper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Doorkeeper.configure do
   # Change the ORM that doorkeeper will use (needs plugins)
   orm :active_record
diff --git a/config/initializers/exception_notification.rb b/config/initializers/exception_notification.rb
index 5423334e..db508b3c 100644
--- a/config/initializers/exception_notification.rb
+++ b/config/initializers/exception_notification.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'exception_notification/rails'
 
 ExceptionNotification.configure do |config|
diff --git a/config/initializers/filter_parameter_logging.rb b/config/initializers/filter_parameter_logging.rb
index 4a994e1e..b7fe1231 100644
--- a/config/initializers/filter_parameter_logging.rb
+++ b/config/initializers/filter_parameter_logging.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Configure sensitive parameters which will be filtered from the log file.
diff --git a/config/initializers/inflections.rb b/config/initializers/inflections.rb
index ac033bf9..aa7435fb 100644
--- a/config/initializers/inflections.rb
+++ b/config/initializers/inflections.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Add new inflection rules using the following format. Inflections
diff --git a/config/initializers/kaminari_config.rb b/config/initializers/kaminari_config.rb
index b1d87b01..5b9883ab 100644
--- a/config/initializers/kaminari_config.rb
+++ b/config/initializers/kaminari_config.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Kaminari.configure do |config|
   # config.default_per_page = 25
   # config.max_per_page = nil
diff --git a/config/initializers/mime_types.rb b/config/initializers/mime_types.rb
index c7b0c86d..5e8d015a 100644
--- a/config/initializers/mime_types.rb
+++ b/config/initializers/mime_types.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Add new mime types for use in respond_to blocks:
diff --git a/config/initializers/new_framework_defaults.rb b/config/initializers/new_framework_defaults.rb
index 0706cafd..d3c12d7b 100644
--- a/config/initializers/new_framework_defaults.rb
+++ b/config/initializers/new_framework_defaults.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 #
 # This file contains migration options to ease your Rails 5.0 upgrade.
diff --git a/config/initializers/paperclip.rb b/config/initializers/paperclip.rb
index 4a65d495..6f094b7c 100644
--- a/config/initializers/paperclip.rb
+++ b/config/initializers/paperclip.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 Paperclip::Attachment.default_options[:url] = ':s3_domain_url'
 Paperclip::Attachment.default_options[:path] = '/:class/:attachment/:id_partition/:style/:filename'
diff --git a/config/initializers/secret_token.rb b/config/initializers/secret_token.rb
index e7f18911..4da6fb50 100644
--- a/config/initializers/secret_token.rb
+++ b/config/initializers/secret_token.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Your secret key for verifying the integrity of signed cookies.
diff --git a/config/initializers/session_store.rb b/config/initializers/session_store.rb
index d2dc13b6..57d69156 100644
--- a/config/initializers/session_store.rb
+++ b/config/initializers/session_store.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 Rails.application.config.session_store :cookie_store, key: '_Metamaps_session'
diff --git a/config/initializers/uservoice.rb b/config/initializers/uservoice.rb
index df04eeaa..3aa65a46 100644
--- a/config/initializers/uservoice.rb
+++ b/config/initializers/uservoice.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'uservoice-ruby'
 
 def current_sso_token
diff --git a/config/initializers/version.rb b/config/initializers/version.rb
index c378cb6f..ff08c330 100644
--- a/config/initializers/version.rb
+++ b/config/initializers/version.rb
@@ -1,2 +1,3 @@
-METAMAPS_VERSION = "2 build `git log -1 --pretty=%H`".freeze
-METAMAPS_LAST_UPDATED = `git log -1 --pretty='%ad'`.split(' ').values_at(1,2,4).join(' ').freeze
+# frozen_string_literal: true
+METAMAPS_VERSION = '2 build `git log -1 --pretty=%H`'
+METAMAPS_LAST_UPDATED = `git log -1 --pretty='%ad'`.split(' ').values_at(1, 2, 4).join(' ').freeze
diff --git a/config/initializers/wrap_parameters.rb b/config/initializers/wrap_parameters.rb
index 36bb3e27..d65576db 100644
--- a/config/initializers/wrap_parameters.rb
+++ b/config/initializers/wrap_parameters.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 #
 # This file contains settings for ActionController::ParamsWrapper which
diff --git a/config/puma.rb b/config/puma.rb
index c7f311f8..da41eff9 100644
--- a/config/puma.rb
+++ b/config/puma.rb
@@ -1,19 +1,20 @@
+# frozen_string_literal: true
 # Puma can serve each request in a thread from an internal thread pool.
 # The `threads` method setting takes two numbers a minimum and maximum.
 # Any libraries that use thread pools should be configured to match
 # the maximum value specified for Puma. Default is set to 5 threads for minimum
 # and maximum, this matches the default thread size of Active Record.
 #
-threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }.to_i
+threads_count = ENV.fetch('RAILS_MAX_THREADS') { 5 }.to_i
 threads threads_count, threads_count
 
 # Specifies the `port` that Puma will listen on to receive requests, default is 3000.
 #
-port        ENV.fetch("PORT") { 3000 }
+port        ENV.fetch('PORT') { 3000 }
 
 # Specifies the `environment` that Puma will run in.
 #
-environment ENV.fetch("RAILS_ENV") { "development" }
+environment ENV.fetch('RAILS_ENV') { 'development' }
 
 # Specifies the number of `workers` to boot in clustered mode.
 # Workers are forked webserver processes. If using threads and workers together
diff --git a/config/routes.rb b/config/routes.rb
index 38fe274e..c64c188e 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Metamaps::Application.routes.draw do
   use_doorkeeper
   root to: 'main#home', via: :get
diff --git a/config/spring.rb b/config/spring.rb
index be72de67..b0ca9589 100644
--- a/config/spring.rb
+++ b/config/spring.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 %w(
   .ruby-version
   .ruby-gemset
diff --git a/lib/tasks/extensions.rake b/lib/tasks/extensions.rake
index bf07cec2..776c81e3 100644
--- a/lib/tasks/extensions.rake
+++ b/lib/tasks/extensions.rake
@@ -1,7 +1,8 @@
+# frozen_string_literal: true
 namespace :assets do
   task :js_compile do
-    system "npm install"
-    system "npm run build"
+    system 'npm install'
+    system 'npm run build'
   end
 end
 
diff --git a/lib/tasks/heroku.rake b/lib/tasks/heroku.rake
index a523a778..d7ce308f 100644
--- a/lib/tasks/heroku.rake
+++ b/lib/tasks/heroku.rake
@@ -1,9 +1,10 @@
+# frozen_string_literal: true
 require 'dotenv/tasks'
 
 namespace :heroku do
   desc 'Generate the Heroku gems manifest from gem dependencies'
   task gems: :dotenv do
-    RAILS_ENV = 'production'.freeze
+    RAILS_ENV = 'production'
     Rake::Task[:environment].invoke
     list = Rails.configuration.gems.collect do |g|
       _command, *options = g.send(:install_command)
diff --git a/lib/tasks/perms.rake b/lib/tasks/perms.rake
index 39cb9b27..bf087bd0 100644
--- a/lib/tasks/perms.rake
+++ b/lib/tasks/perms.rake
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'dotenv/tasks'
 
 namespace :perms do
diff --git a/script/rails b/script/rails
index a861c543..1267847e 100644
--- a/script/rails
+++ b/script/rails
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby.exe
+# frozen_string_literal: true
 # This command will automatically be run when you run "rails" with Rails 3 gems installed from the root of your application.
 
 APP_PATH = File.expand_path('../../config/application', __FILE__)
diff --git a/spec/api/v2/mappings_api_spec.rb b/spec/api/v2/mappings_api_spec.rb
index 4a1e3298..f3ec6a75 100644
--- a/spec/api/v2/mappings_api_spec.rb
+++ b/spec/api/v2/mappings_api_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe 'mappings API', type: :request do
diff --git a/spec/api/v2/maps_api_spec.rb b/spec/api/v2/maps_api_spec.rb
index 7356ca72..77cbc24b 100644
--- a/spec/api/v2/maps_api_spec.rb
+++ b/spec/api/v2/maps_api_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe 'maps API', type: :request do
diff --git a/spec/api/v2/synapses_api_spec.rb b/spec/api/v2/synapses_api_spec.rb
index f232b879..c422f3bc 100644
--- a/spec/api/v2/synapses_api_spec.rb
+++ b/spec/api/v2/synapses_api_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe 'synapses API', type: :request do
diff --git a/spec/api/v2/tokens_api_spec.rb b/spec/api/v2/tokens_api_spec.rb
index c2e480a5..cd424ba0 100644
--- a/spec/api/v2/tokens_api_spec.rb
+++ b/spec/api/v2/tokens_api_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe 'tokens API', type: :request do
diff --git a/spec/api/v2/topics_api_spec.rb b/spec/api/v2/topics_api_spec.rb
index 4781348a..9811071d 100644
--- a/spec/api/v2/topics_api_spec.rb
+++ b/spec/api/v2/topics_api_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe 'topics API', type: :request do
diff --git a/spec/controllers/mappings_controller_spec.rb b/spec/controllers/mappings_controller_spec.rb
index bcd2b97f..8d1c424d 100644
--- a/spec/controllers/mappings_controller_spec.rb
+++ b/spec/controllers/mappings_controller_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe MappingsController, type: :controller do
diff --git a/spec/controllers/maps_controller_spec.rb b/spec/controllers/maps_controller_spec.rb
index 278ec559..0f053dd9 100644
--- a/spec/controllers/maps_controller_spec.rb
+++ b/spec/controllers/maps_controller_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe MapsController, type: :controller do
diff --git a/spec/controllers/metacodes_controller_spec.rb b/spec/controllers/metacodes_controller_spec.rb
index cb4116d4..b25017b9 100644
--- a/spec/controllers/metacodes_controller_spec.rb
+++ b/spec/controllers/metacodes_controller_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe MetacodesController, type: :controller do
diff --git a/spec/controllers/synapses_controller_spec.rb b/spec/controllers/synapses_controller_spec.rb
index 15d91250..3a5310e4 100644
--- a/spec/controllers/synapses_controller_spec.rb
+++ b/spec/controllers/synapses_controller_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe SynapsesController, type: :controller do
diff --git a/spec/controllers/topics_controller_spec.rb b/spec/controllers/topics_controller_spec.rb
index 315b931f..0d7e3010 100644
--- a/spec/controllers/topics_controller_spec.rb
+++ b/spec/controllers/topics_controller_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe TopicsController, type: :controller do
diff --git a/spec/factories/mappings.rb b/spec/factories/mappings.rb
index bed0b754..1bcdf891 100644
--- a/spec/factories/mappings.rb
+++ b/spec/factories/mappings.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 FactoryGirl.define do
   factory :mapping do
     xloc 0
diff --git a/spec/factories/maps.rb b/spec/factories/maps.rb
index 14450c00..a95590e4 100644
--- a/spec/factories/maps.rb
+++ b/spec/factories/maps.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 FactoryGirl.define do
   factory :map do
     sequence(:name) { |n| "Cool Map ##{n}" }
diff --git a/spec/factories/metacodes.rb b/spec/factories/metacodes.rb
index 543e4955..2ed71beb 100644
--- a/spec/factories/metacodes.rb
+++ b/spec/factories/metacodes.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 FactoryGirl.define do
   factory :metacode do
     sequence(:name) { |n| "Cool Metacode ##{n}" }
diff --git a/spec/factories/synapses.rb b/spec/factories/synapses.rb
index db82fc39..6af8ca9e 100644
--- a/spec/factories/synapses.rb
+++ b/spec/factories/synapses.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 FactoryGirl.define do
   factory :synapse do
     sequence(:desc) { |n| "Cool synapse ##{n}" }
@@ -6,6 +7,6 @@ FactoryGirl.define do
     association :topic1, factory: :topic
     association :topic2, factory: :topic
     user
-    weight 1 # todo drop this column
+    weight 1 # TODO: drop this column
   end
 end
diff --git a/spec/factories/tokens.rb b/spec/factories/tokens.rb
index 3970d76f..6d5f110b 100644
--- a/spec/factories/tokens.rb
+++ b/spec/factories/tokens.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 FactoryGirl.define do
   factory :token do
     user
diff --git a/spec/factories/topics.rb b/spec/factories/topics.rb
index f4c73f4c..a6048d7c 100644
--- a/spec/factories/topics.rb
+++ b/spec/factories/topics.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 FactoryGirl.define do
   factory :topic do
     user
diff --git a/spec/factories/users.rb b/spec/factories/users.rb
index 746f52b1..b5b20b9a 100644
--- a/spec/factories/users.rb
+++ b/spec/factories/users.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 #
 # This file supports three factories, because code and joinedwithcode
 # make things complicated!
diff --git a/spec/mailers/previews/map_mailer_preview.rb b/spec/mailers/previews/map_mailer_preview.rb
index 60310bf4..96d07c07 100644
--- a/spec/mailers/previews/map_mailer_preview.rb
+++ b/spec/mailers/previews/map_mailer_preview.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Preview all emails at http://localhost:3000/rails/mailers/map_mailer
 class MapMailerPreview < ActionMailer::Preview
   def invite_to_edit_email
diff --git a/spec/models/map_spec.rb b/spec/models/map_spec.rb
index e70429be..3f3089cf 100644
--- a/spec/models/map_spec.rb
+++ b/spec/models/map_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe Map, type: :model do
diff --git a/spec/models/mapping_spec.rb b/spec/models/mapping_spec.rb
index 54c72b88..343c19ee 100644
--- a/spec/models/mapping_spec.rb
+++ b/spec/models/mapping_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe Mapping, type: :model do
diff --git a/spec/models/metacode_spec.rb b/spec/models/metacode_spec.rb
index c9b34527..49354898 100644
--- a/spec/models/metacode_spec.rb
+++ b/spec/models/metacode_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe Metacode, type: :model do
diff --git a/spec/models/synapse_spec.rb b/spec/models/synapse_spec.rb
index 3bdb1ac4..c5b63a41 100644
--- a/spec/models/synapse_spec.rb
+++ b/spec/models/synapse_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe Synapse, type: :model do
diff --git a/spec/models/token_spec.rb b/spec/models/token_spec.rb
index 50e89c02..82582218 100644
--- a/spec/models/token_spec.rb
+++ b/spec/models/token_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe Token, type: :model do
diff --git a/spec/models/topic_spec.rb b/spec/models/topic_spec.rb
index dbaac86d..50e6d74b 100644
--- a/spec/models/topic_spec.rb
+++ b/spec/models/topic_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe Topic, type: :model do
diff --git a/spec/policies/map_policy_spec.rb b/spec/policies/map_policy_spec.rb
index 7dd33707..c08432dd 100644
--- a/spec/policies/map_policy_spec.rb
+++ b/spec/policies/map_policy_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe MapPolicy, type: :policy do
diff --git a/spec/policies/mapping_policy_spec.rb b/spec/policies/mapping_policy_spec.rb
index 46b9c117..4010e589 100644
--- a/spec/policies/mapping_policy_spec.rb
+++ b/spec/policies/mapping_policy_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe MappingPolicy, type: :policy do
diff --git a/spec/policies/synapse_policy.rb b/spec/policies/synapse_policy.rb
index 4c725e37..4d9d422c 100644
--- a/spec/policies/synapse_policy.rb
+++ b/spec/policies/synapse_policy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe SynapsePolicy, type: :policy do
diff --git a/spec/policies/topic_policy_spec.rb b/spec/policies/topic_policy_spec.rb
index 7078496c..ef80e8dc 100644
--- a/spec/policies/topic_policy_spec.rb
+++ b/spec/policies/topic_policy_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'rails_helper'
 
 RSpec.describe TopicPolicy, type: :policy do
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index d14d6dbe..ddf0781c 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 ENV['RAILS_ENV'] ||= 'test'
 require 'spec_helper'
 require File.expand_path('../../config/environment', __FILE__)
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index a2b164b2..a3477eb7 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 RSpec.configure do |config|
   config.expect_with :rspec do |expectations|
     expectations.include_chain_clauses_in_custom_matcher_descriptions = true
diff --git a/spec/support/controller_helpers.rb b/spec/support/controller_helpers.rb
index 1672479f..1d24b7ca 100644
--- a/spec/support/controller_helpers.rb
+++ b/spec/support/controller_helpers.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # https://github.com/plataformatec/devise/wiki/How-To:-Stub-authentication-in-controller-specs
 
 require 'devise'
diff --git a/spec/support/factory_girl.rb b/spec/support/factory_girl.rb
index afae617a..0d10fa34 100644
--- a/spec/support/factory_girl.rb
+++ b/spec/support/factory_girl.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # lets you type create(:user) instead of FactoryGirl.create(:user)
 RSpec.configure do |config|
   config.include FactoryGirl::Syntax::Methods
diff --git a/spec/support/pundit.rb b/spec/support/pundit.rb
index 1fd8e296..6e8dc0ce 100644
--- a/spec/support/pundit.rb
+++ b/spec/support/pundit.rb
@@ -1 +1,2 @@
+# frozen_string_literal: true
 require 'pundit/rspec'
diff --git a/spec/support/schema_matcher.rb b/spec/support/schema_matcher.rb
index 207c5fa6..998771d9 100644
--- a/spec/support/schema_matcher.rb
+++ b/spec/support/schema_matcher.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 RSpec::Matchers.define :match_json_schema do |schema_name|
   match do |response|
     schema_directory = Rails.root.join('doc', 'api', 'schemas').to_s
diff --git a/spec/support/simplecov.rb b/spec/support/simplecov.rb
index 8017e897..1d48d7c8 100644
--- a/spec/support/simplecov.rb
+++ b/spec/support/simplecov.rb
@@ -1,2 +1,2 @@
+# frozen_string_literal: true
 require 'simplecov'
-