diff --git a/Gemfile b/Gemfile
index 792f5cb..f9b353a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,10 +17,11 @@ gem "bootsnap", require: false
 # gem "image_processing", "~> 1.2"
 
 group :development, :test do
-  gem "debug", platforms: %i[ mri mingw x64_mingw ]
+  gem "debug", platforms: %i[mri mingw x64_mingw]
 end
 
 group :development do
+  gem "standard"
   gem "web-console"
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index c0a9e2c..f52c78a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -68,6 +68,7 @@ GEM
       tzinfo (~> 2.0)
     addressable (2.8.1)
       public_suffix (>= 2.0.2, < 6.0)
+    ast (2.4.2)
     bindex (0.8.1)
     bootsnap (1.14.0)
       msgpack (~> 1.2)
@@ -102,6 +103,8 @@ GEM
     jbuilder (2.11.5)
       actionview (>= 5.0.0)
       activesupport (>= 5.0.0)
+    json (2.6.3)
+    language_server-protocol (3.17.0.3)
     loofah (2.19.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
@@ -128,6 +131,9 @@ GEM
     nio4r (2.5.8)
     nokogiri (1.14.2-x86_64-linux)
       racc (~> 1.4)
+    parallel (1.22.1)
+    parser (3.2.1.1)
+      ast (~> 2.4.1)
     public_suffix (5.0.0)
     puma (6.1.1)
       nio4r (~> 2.0)
@@ -161,11 +167,28 @@ GEM
       rake (>= 12.2)
       thor (~> 1.0)
       zeitwerk (~> 2.5)
+    rainbow (3.1.1)
     rake (13.0.6)
     regexp_parser (2.6.1)
     reline (0.3.1)
       io-console (~> 0.5)
     rexml (3.2.5)
+    rubocop (1.44.1)
+      json (~> 2.3)
+      parallel (~> 1.10)
+      parser (>= 3.2.0.0)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.24.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.27.0)
+      parser (>= 3.2.1.0)
+    rubocop-performance (1.15.2)
+      rubocop (>= 1.7.0, < 2.0)
+      rubocop-ast (>= 0.4.0)
+    ruby-progressbar (1.13.0)
     rubyzip (2.3.2)
     selenium-webdriver (4.6.1)
       childprocess (>= 0.5, < 5.0)
@@ -180,6 +203,10 @@ GEM
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
     sqlite3 (1.6.1-x86_64-linux)
+    standard (1.24.3)
+      language_server-protocol (~> 3.17.0.2)
+      rubocop (= 1.44.1)
+      rubocop-performance (= 1.15.2)
     stimulus-rails (1.1.1)
       railties (>= 6.0.0)
     tailwindcss-rails (2.0.21-x86_64-linux)
@@ -192,6 +219,7 @@ GEM
       railties (>= 6.0.0)
     tzinfo (2.0.5)
       concurrent-ruby (~> 1.0)
+    unicode-display_width (2.4.2)
     web-console (4.2.0)
       actionview (>= 6.0.0)
       activemodel (>= 6.0.0)
@@ -223,6 +251,7 @@ DEPENDENCIES
   selenium-webdriver
   sprockets-rails
   sqlite3
+  standard
   stimulus-rails
   tailwindcss-rails (~> 2.0)
   turbo-rails
diff --git a/app/controllers/credit_card_bills_controller.rb b/app/controllers/credit_card_bills_controller.rb
index 8c41a88..d1f027a 100644
--- a/app/controllers/credit_card_bills_controller.rb
+++ b/app/controllers/credit_card_bills_controller.rb
@@ -1,5 +1,5 @@
 class CreditCardBillsController < ApplicationController
-  before_action :set_credit_card_bill, only: %i[ show edit update destroy ]
+  before_action :set_credit_card_bill, only: %i[show edit update destroy]
 
   # GET /credit_card_bills or /credit_card_bills.json
   def index
@@ -58,13 +58,14 @@ class CreditCardBillsController < ApplicationController
   end
 
   private
-    # Use callbacks to share common setup or constraints between actions.
-    def set_credit_card_bill
-      @credit_card_bill = CreditCardBill.find(params[:id])
-    end
 
-    # Only allow a list of trusted parameters through.
-    def credit_card_bill_params
-      params.require(:credit_card_bill).permit(:description, :amount)
-    end
+  # Use callbacks to share common setup or constraints between actions.
+  def set_credit_card_bill
+    @credit_card_bill = CreditCardBill.find(params[:id])
+  end
+
+  # Only allow a list of trusted parameters through.
+  def credit_card_bill_params
+    params.require(:credit_card_bill).permit(:description, :amount)
+  end
 end
diff --git a/app/controllers/expenses_controller.rb b/app/controllers/expenses_controller.rb
index 34fb814..e5aa320 100644
--- a/app/controllers/expenses_controller.rb
+++ b/app/controllers/expenses_controller.rb
@@ -1,5 +1,5 @@
 class ExpensesController < ApplicationController
-  before_action :set_expense, only: %i[ show edit update destroy ]
+  before_action :set_expense, only: %i[show edit update destroy]
 
   # GET /expenses or /expenses.json
   def index
@@ -58,13 +58,14 @@ class ExpensesController < ApplicationController
   end
 
   private
-    # Use callbacks to share common setup or constraints between actions.
-    def set_expense
-      @expense = Expense.find(params[:id])
-    end
 
-    # Only allow a list of trusted parameters through.
-    def expense_params
-      params.require(:expense).permit(:description, :payment, :period, :credit_card, :estimated)
-    end
+  # Use callbacks to share common setup or constraints between actions.
+  def set_expense
+    @expense = Expense.find(params[:id])
+  end
+
+  # Only allow a list of trusted parameters through.
+  def expense_params
+    params.require(:expense).permit(:description, :payment, :period, :credit_card, :estimated)
+  end
 end
diff --git a/app/controllers/incomes_controller.rb b/app/controllers/incomes_controller.rb
index 2623267..c7cee9e 100644
--- a/app/controllers/incomes_controller.rb
+++ b/app/controllers/incomes_controller.rb
@@ -1,5 +1,5 @@
 class IncomesController < ApplicationController
-  before_action :set_income, only: %i[ show edit update destroy ]
+  before_action :set_income, only: %i[show edit update destroy]
 
   # GET /incomes or /incomes.json
   def index
@@ -58,13 +58,14 @@ class IncomesController < ApplicationController
   end
 
   private
-    # Use callbacks to share common setup or constraints between actions.
-    def set_income
-      @income = Income.find(params[:id])
-    end
 
-    # Only allow a list of trusted parameters through.
-    def income_params
-      params.require(:income).permit(:description, :included, :amount, :member_id)
-    end
+  # Use callbacks to share common setup or constraints between actions.
+  def set_income
+    @income = Income.find(params[:id])
+  end
+
+  # Only allow a list of trusted parameters through.
+  def income_params
+    params.require(:income).permit(:description, :included, :amount, :member_id)
+  end
 end
diff --git a/app/controllers/members_controller.rb b/app/controllers/members_controller.rb
index 6052ca8..647cec5 100644
--- a/app/controllers/members_controller.rb
+++ b/app/controllers/members_controller.rb
@@ -1,5 +1,5 @@
 class MembersController < ApplicationController
-  before_action :set_member, only: %i[ show edit update destroy ]
+  before_action :set_member, only: %i[show edit update destroy]
 
   # GET /members or /members.json
   def index
@@ -58,13 +58,14 @@ class MembersController < ApplicationController
   end
 
   private
-    # Use callbacks to share common setup or constraints between actions.
-    def set_member
-      @member = Member.find(params[:id])
-    end
 
-    # Only allow a list of trusted parameters through.
-    def member_params
-      params.require(:member).permit(:name, :pays)
-    end
+  # Use callbacks to share common setup or constraints between actions.
+  def set_member
+    @member = Member.find(params[:id])
+  end
+
+  # Only allow a list of trusted parameters through.
+  def member_params
+    params.require(:member).permit(:name, :pays)
+  end
 end
diff --git a/app/models/expense.rb b/app/models/expense.rb
index 3e38e34..9f7c413 100644
--- a/app/models/expense.rb
+++ b/app/models/expense.rb
@@ -3,7 +3,7 @@ class Expense < ApplicationRecord
     monthly: 12,
     annually: 1,
     weekly: 52,
-    quarterly: 4,
+    quarterly: 4
   }.freeze
   enum :period, PERIOD_OCCURENCES.keys
 
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 3196e5f..b75b764 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -13,7 +13,7 @@ Rails.application.configure do
   config.eager_load = true
 
   # Full error reports are disabled and caching is turned on.
-  config.consider_all_requests_local       = false
+  config.consider_all_requests_local = false
   config.action_controller.perform_caching = true
 
   # Ensures that a master key has been made available in either ENV["RAILS_MASTER_KEY"]
@@ -53,7 +53,7 @@ Rails.application.configure do
   config.log_level = :info
 
   # Prepend all log lines with the following tags.
-  config.log_tags = [ :request_id ]
+  config.log_tags = [:request_id]
 
   # Use a different cache store in production.
   # config.cache_store = :mem_cache_store
@@ -83,9 +83,9 @@ Rails.application.configure do
   # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new "app-name")
 
   if ENV["RAILS_LOG_TO_STDOUT"].present?
-    logger           = ActiveSupport::Logger.new(STDOUT)
+    logger = ActiveSupport::Logger.new($stdout)
     logger.formatter = config.log_formatter
-    config.logger    = ActiveSupport::TaggedLogging.new(logger)
+    config.logger = ActiveSupport::TaggedLogging.new(logger)
   end
 
   # Do not dump schema after migrations.
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 6ea4d1e..9de8427 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -23,7 +23,7 @@ Rails.application.configure do
   }
 
   # Show full error reports and disable caching.
-  config.consider_all_requests_local       = true
+  config.consider_all_requests_local = true
   config.action_controller.perform_caching = false
   config.cache_store = :null_store
 
diff --git a/config/puma.rb b/config/puma.rb
index daaf036..ce4878f 100644
--- a/config/puma.rb
+++ b/config/puma.rb
@@ -4,7 +4,7 @@
 # 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.
 #
-max_threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
+max_threads_count = ENV.fetch("RAILS_MAX_THREADS", 5)
 min_threads_count = ENV.fetch("RAILS_MIN_THREADS") { max_threads_count }
 threads min_threads_count, max_threads_count
 
@@ -15,7 +15,7 @@ worker_timeout 3600 if ENV.fetch("RAILS_ENV", "development") == "development"
 
 # 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.
 #
diff --git a/test/controllers/credit_card_bills_controller_test.rb b/test/controllers/credit_card_bills_controller_test.rb
index 85a7106..6f4a29c 100644
--- a/test/controllers/credit_card_bills_controller_test.rb
+++ b/test/controllers/credit_card_bills_controller_test.rb
@@ -17,7 +17,7 @@ class CreditCardBillsControllerTest < ActionDispatch::IntegrationTest
 
   test "should create credit_card_bill" do
     assert_difference("CreditCardBill.count") do
-      post credit_card_bills_url, params: { credit_card_bill: { amount: @credit_card_bill.amount, description: @credit_card_bill.description } }
+      post credit_card_bills_url, params: {credit_card_bill: {amount: @credit_card_bill.amount, description: @credit_card_bill.description}}
     end
 
     assert_redirected_to credit_card_bill_url(CreditCardBill.last)
@@ -34,7 +34,7 @@ class CreditCardBillsControllerTest < ActionDispatch::IntegrationTest
   end
 
   test "should update credit_card_bill" do
-    patch credit_card_bill_url(@credit_card_bill), params: { credit_card_bill: { amount: @credit_card_bill.amount, description: @credit_card_bill.description } }
+    patch credit_card_bill_url(@credit_card_bill), params: {credit_card_bill: {amount: @credit_card_bill.amount, description: @credit_card_bill.description}}
     assert_redirected_to credit_card_bill_url(@credit_card_bill)
   end
 
diff --git a/test/controllers/expenses_controller_test.rb b/test/controllers/expenses_controller_test.rb
index 49c2498..4f218a6 100644
--- a/test/controllers/expenses_controller_test.rb
+++ b/test/controllers/expenses_controller_test.rb
@@ -17,7 +17,7 @@ class ExpensesControllerTest < ActionDispatch::IntegrationTest
 
   test "should create expense" do
     assert_difference("Expense.count") do
-      post expenses_url, params: { expense: { credit_card: @expense.credit_card, description: @expense.description, estimated: @expense.estimated, payment: @expense.payment, period: @expense.period } }
+      post expenses_url, params: {expense: {credit_card: @expense.credit_card, description: @expense.description, estimated: @expense.estimated, payment: @expense.payment, period: @expense.period}}
     end
 
     assert_redirected_to expense_url(Expense.last)
@@ -34,7 +34,7 @@ class ExpensesControllerTest < ActionDispatch::IntegrationTest
   end
 
   test "should update expense" do
-    patch expense_url(@expense), params: { expense: { credit_card: @expense.credit_card, description: @expense.description, estimated: @expense.estimated, payment: @expense.payment, period: @expense.period } }
+    patch expense_url(@expense), params: {expense: {credit_card: @expense.credit_card, description: @expense.description, estimated: @expense.estimated, payment: @expense.payment, period: @expense.period}}
     assert_redirected_to expense_url(@expense)
   end
 
diff --git a/test/controllers/incomes_controller_test.rb b/test/controllers/incomes_controller_test.rb
index cb07fbd..361a2f4 100644
--- a/test/controllers/incomes_controller_test.rb
+++ b/test/controllers/incomes_controller_test.rb
@@ -17,7 +17,7 @@ class IncomesControllerTest < ActionDispatch::IntegrationTest
 
   test "should create income" do
     assert_difference("Income.count") do
-      post incomes_url, params: { income: { amount: @income.amount, description: @income.description, included: @income.included, member_id: @income.member_id } }
+      post incomes_url, params: {income: {amount: @income.amount, description: @income.description, included: @income.included, member_id: @income.member_id}}
     end
 
     assert_redirected_to income_url(Income.last)
@@ -34,7 +34,7 @@ class IncomesControllerTest < ActionDispatch::IntegrationTest
   end
 
   test "should update income" do
-    patch income_url(@income), params: { income: { amount: @income.amount, description: @income.description, included: @income.included, member_id: @income.member_id } }
+    patch income_url(@income), params: {income: {amount: @income.amount, description: @income.description, included: @income.included, member_id: @income.member_id}}
     assert_redirected_to income_url(@income)
   end
 
diff --git a/test/controllers/members_controller_test.rb b/test/controllers/members_controller_test.rb
index ac2b771..c04df44 100644
--- a/test/controllers/members_controller_test.rb
+++ b/test/controllers/members_controller_test.rb
@@ -17,7 +17,7 @@ class MembersControllerTest < ActionDispatch::IntegrationTest
 
   test "should create member" do
     assert_difference("Member.count") do
-      post members_url, params: { member: { name: @member.name, pays: @member.pays } }
+      post members_url, params: {member: {name: @member.name, pays: @member.pays}}
     end
 
     assert_redirected_to member_url(Member.last)
@@ -34,7 +34,7 @@ class MembersControllerTest < ActionDispatch::IntegrationTest
   end
 
   test "should update member" do
-    patch member_url(@member), params: { member: { name: @member.name, pays: @member.pays } }
+    patch member_url(@member), params: {member: {name: @member.name, pays: @member.pays}}
     assert_redirected_to member_url(@member)
   end