diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 466047c..d3f1a74 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -24,5 +24,5 @@ jobs:
       with:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true
-    - name: Run the default task
-      run: bundle exec rspec
+    - name: Cops & Specs
+      run: bin/rake
diff --git a/.rubocop.yml b/.rubocop.yml
index 17b1f43..3a733b3 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,13 +1,20 @@
 AllCops:
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.6
+  NewCops: enable
+
+Style/StringLiterals:
+  Enabled: true
+  EnforcedStyle: double_quotes
+
+Style/StringLiteralsInInterpolation:
+  Enabled: true
+  EnforcedStyle: double_quotes
+
+Style/Documentation:
+  Enabled: false
+
+Layout/LineLength:
+  Max: 150
 
 Metrics/BlockLength:
-  Exclude:
-    - 'spec/**/*.rb'
-
-Metrics/LineLength:
-  Max: 100
-
-Naming/FileName:
-  Exclude:
-    - 'lib/*.rb'
+  IgnoredMethods: ['describe', 'context', 'shared_examples']
diff --git a/Gemfile b/Gemfile
index fd22095..ffc917a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-source 'https://rubygems.org'
+source "https://rubygems.org"
 
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
@@ -8,6 +8,11 @@ git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 gemspec
 
 group :development, :test do
-  gem 'pry',        platform: :mri
-  gem 'pry-byebug', platform: :mri
+  gem "pry"
+  gem "pry-byebug"
+  gem "rake", "~> 13.0"
+  gem "rspec", "~> 3.0"
+  gem "rubocop", "~> 1.21"
+  gem "rubocop-rake", "~> 0.6.0"
+  gem "rubocop-rspec", "~> 2.5"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 22aa404..8bb2051 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
   specs:
     addressable (2.6.0)
       public_suffix (>= 2.0.2, < 4.0)
-    ast (2.4.0)
+    ast (2.4.2)
     byebug (11.0.1)
     coderay (1.1.2)
     concurrent-ruby (1.1.7)
@@ -26,15 +26,14 @@ GEM
     hashdiff (0.4.0)
     i18n (1.8.5)
       concurrent-ruby (~> 1.0)
-    jaro_winkler (1.5.2)
     json (2.2.0)
     method_source (0.9.2)
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2020.1104)
-    parallel (1.17.0)
-    parser (2.6.3.0)
-      ast (~> 2.4.0)
+    parallel (1.21.0)
+    parser (3.0.2.0)
+      ast (~> 2.4.1)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
@@ -44,7 +43,9 @@ GEM
     public_suffix (3.1.0)
     rack (2.2.3)
     rainbow (3.0.0)
-    rake (12.3.2)
+    rake (13.0.6)
+    regexp_parser (2.1.1)
+    rexml (3.2.5)
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
       rspec-expectations (~> 3.8.0)
@@ -58,14 +59,22 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.0)
-    rubocop (0.71.0)
-      jaro_winkler (~> 1.5.1)
+    rubocop (1.22.3)
       parallel (~> 1.10)
-      parser (>= 2.6)
+      parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml
+      rubocop-ast (>= 1.12.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 1.7)
-    ruby-progressbar (1.10.1)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.12.0)
+      parser (>= 3.0.1.1)
+    rubocop-rake (0.6.0)
+      rubocop (~> 1.0)
+    rubocop-rspec (2.5.0)
+      rubocop (~> 1.19)
+    ruby-progressbar (1.11.0)
     safe_yaml (1.0.5)
     simplecov (0.16.1)
       docile (~> 1.1)
@@ -75,7 +84,7 @@ GEM
     tram-policy (2.0.1)
       dry-initializer (> 2, < 4)
       i18n (~> 1.0)
-    unicode-display_width (1.6.0)
+    unicode-display_width (2.1.0)
     webmock (3.5.1)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
@@ -87,9 +96,11 @@ PLATFORMS
 DEPENDENCIES
   pry
   pry-byebug
-  rake (>= 10.0)
-  rspec (~> 3.5)
-  rubocop (~> 0.71)
+  rake (~> 13.0)
+  rspec (~> 3.0)
+  rubocop (~> 1.21)
+  rubocop-rake (~> 0.6.0)
+  rubocop-rspec (~> 2.5)
   simplecov (~> 0.16)
   webmock (~> 3.5)
   yookassa!
diff --git a/Rakefile b/Rakefile
index b7e9ed5..dcdeab9 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,6 +1,12 @@
+# frozen_string_literal: true
+
 require "bundler/gem_tasks"
 require "rspec/core/rake_task"
 
 RSpec::Core::RakeTask.new(:spec)
 
-task :default => :spec
+require "rubocop/rake_task"
+
+RuboCop::RakeTask.new
+
+task default: %i[rubocop spec]
diff --git a/bin/rake b/bin/rake
new file mode 100755
index 0000000..852b747
--- /dev/null
+++ b/bin/rake
@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'rake' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+                                           Pathname.new(__FILE__).realpath)
+
+bundle_binstub = File.expand_path("bundle", __dir__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("rake", "rake")
diff --git a/bin/rspec b/bin/rspec
new file mode 100755
index 0000000..0fa393d
--- /dev/null
+++ b/bin/rspec
@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'rspec' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+                                           Pathname.new(__FILE__).realpath)
+
+bundle_binstub = File.expand_path("bundle", __dir__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("rspec-core", "rspec")
diff --git a/bin/rubocop b/bin/rubocop
new file mode 100755
index 0000000..710ad45
--- /dev/null
+++ b/bin/rubocop
@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'rubocop' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+                                           Pathname.new(__FILE__).realpath)
+
+bundle_binstub = File.expand_path("bundle", __dir__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("rubocop", "rubocop")
diff --git a/lib/yookassa.rb b/lib/yookassa.rb
index 9f53334..074d01f 100644
--- a/lib/yookassa.rb
+++ b/lib/yookassa.rb
@@ -1,13 +1,13 @@
 # frozen_string_literal: true
 
-require 'evil/client'
+require "evil/client"
 
-require 'yookassa/version'
-require 'yookassa/payment'
-require 'yookassa/refund'
-require 'yookassa/response'
-require 'yookassa/callable'
-require 'yookassa/optional'
-require 'yookassa/entity/payment'
-require 'yookassa/entity/refund'
-require 'yookassa/error'
+require "yookassa/version"
+require "yookassa/payment"
+require "yookassa/refund"
+require "yookassa/response"
+require "yookassa/callable"
+require "yookassa/optional"
+require "yookassa/entity/payment"
+require "yookassa/entity/refund"
+require "yookassa/error"
diff --git a/lib/yookassa/entity/payment.rb b/lib/yookassa/entity/payment.rb
index e91f5b4..7fb4133 100644
--- a/lib/yookassa/entity/payment.rb
+++ b/lib/yookassa/entity/payment.rb
@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
-require_relative './amount'
-require_relative './payment_method'
-require_relative './confirmation'
+require_relative "./amount"
+require_relative "./payment_method"
+require_relative "./confirmation"
 
 module Yookassa
   module Entity
diff --git a/lib/yookassa/entity/payment_method.rb b/lib/yookassa/entity/payment_method.rb
index fb123eb..a7a93ea 100644
--- a/lib/yookassa/entity/payment_method.rb
+++ b/lib/yookassa/entity/payment_method.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative './card'
+require_relative "./card"
 
 module Yookassa
   module Entity
diff --git a/lib/yookassa/entity/refund.rb b/lib/yookassa/entity/refund.rb
index 56dabea..a5da761 100644
--- a/lib/yookassa/entity/refund.rb
+++ b/lib/yookassa/entity/refund.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative './amount'
+require_relative "./amount"
 
 module Yookassa
   module Entity
diff --git a/lib/yookassa/error.rb b/lib/yookassa/error.rb
index 7181614..e4d9974 100644
--- a/lib/yookassa/error.rb
+++ b/lib/yookassa/error.rb
@@ -13,7 +13,7 @@ module Yookassa
     option :parameter, proc(&:to_s), optional: true
 
     def error?
-      type == 'error'
+      type == "error"
     end
 
     class << self
@@ -23,7 +23,7 @@ module Yookassa
       end
 
       def new(opts)
-        super opts.each_with_object({}) { |(key, val), obj| obj[key.to_sym] = val }
+        super opts.transform_keys(&:to_sym)
       end
     end
   end
diff --git a/lib/yookassa/optional.rb b/lib/yookassa/optional.rb
index 4bed54c..026c9eb 100644
--- a/lib/yookassa/optional.rb
+++ b/lib/yookassa/optional.rb
@@ -5,7 +5,7 @@ module Yookassa
     private
 
     def initialize(opts)
-      super opts.each_with_object({}) { |(key, val), obj| obj[key.to_sym] = val }
+      super opts.transform_keys(&:to_sym)
     end
 
     def __options__
diff --git a/lib/yookassa/payment.rb b/lib/yookassa/payment.rb
index 53bdc3c..5dd3d5c 100644
--- a/lib/yookassa/payment.rb
+++ b/lib/yookassa/payment.rb
@@ -5,7 +5,7 @@ module Yookassa
     option :shop_id,  proc(&:to_s)
     option :api_key,  proc(&:to_s)
 
-    path { 'https://api.yookassa.ru/v3/payments' }
+    path { "https://api.yookassa.ru/v3/payments" }
     security { basic_auth shop_id, api_key }
 
     operation :get_payment_info do
@@ -24,8 +24,8 @@ module Yookassa
 
       http_method :post
 
-      format 'json'
-      headers { { 'Idempotence-Key' => idempotency_key } }
+      format "json"
+      headers { { "Idempotence-Key" => idempotency_key } }
       body { payment }
 
       response(200) { |*res| Entity::Payment.build(*res) }
@@ -40,8 +40,8 @@ module Yookassa
 
       path { "/#{payment_id}/capture" }
 
-      format 'json'
-      headers { { 'Idempotence-Key' => idempotency_key } }
+      format "json"
+      headers { { "Idempotence-Key" => idempotency_key } }
 
       response(200) { |*res| Entity::Payment.build(*res) }
       response(400) { |*res| Error.build(*res) }
@@ -55,8 +55,8 @@ module Yookassa
 
       path { "/#{payment_id}/cancel" }
 
-      format 'json'
-      headers { { 'Idempotence-Key' => idempotency_key } }
+      format "json"
+      headers { { "Idempotence-Key" => idempotency_key } }
 
       response(200) { |*res| Entity::Payment.build(*res) }
       response(400) { |*res| Error.build(*res) }
diff --git a/lib/yookassa/refund.rb b/lib/yookassa/refund.rb
index a3acf5b..78fda6a 100644
--- a/lib/yookassa/refund.rb
+++ b/lib/yookassa/refund.rb
@@ -5,7 +5,7 @@ module Yookassa
     option :shop_id,  proc(&:to_s)
     option :api_key,  proc(&:to_s)
 
-    path { 'https://api.yookassa.ru/v3/refunds' }
+    path { "https://api.yookassa.ru/v3/refunds" }
     security { basic_auth shop_id, api_key }
 
     operation :get_refund_info do
@@ -24,8 +24,8 @@ module Yookassa
 
       http_method :post
 
-      format 'json'
-      headers { { 'Idempotence-Key' => idempotency_key } }
+      format "json"
+      headers { { "Idempotence-Key" => idempotency_key } }
       body { payload }
 
       response(200) { |*res| Entity::Refund.build(*res) }
diff --git a/lib/yookassa/response.rb b/lib/yookassa/response.rb
index f4053b9..9c0fc19 100644
--- a/lib/yookassa/response.rb
+++ b/lib/yookassa/response.rb
@@ -4,7 +4,7 @@ module Yookassa
   class Response
     extend Dry::Initializer
     option :id, proc(&:to_s)
-    option :status, proc(&:to_s), default: proc { nil }
+    option :status, proc(&:to_s), default: proc {}
 
     class << self
       def build(*res)
@@ -13,7 +13,7 @@ module Yookassa
       end
 
       def new(opts)
-        super opts.each_with_object({}) { |(key, val), obj| obj[key.to_sym] = val }
+        super opts.transform_keys(&:to_sym)
       end
     end
   end
diff --git a/lib/yookassa/version.rb b/lib/yookassa/version.rb
index 66fd411..fe42168 100644
--- a/lib/yookassa/version.rb
+++ b/lib/yookassa/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Yookassa
-  VERSION = '0.1.0'
+  VERSION = "0.1.0"
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 1539d0c..56a2849 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,13 +1,13 @@
 # frozen_string_literal: true
 
 begin
-  require 'pry'
+  require "pry"
 rescue LoadError
   nil
 end
 
-require 'yookassa'
-require 'webmock/rspec'
+require "yookassa"
+require "webmock/rspec"
 
 RSpec.configure do |config|
   config.order = :random
diff --git a/spec/yookassa/payment_spec.rb b/spec/yookassa/payment_spec.rb
index dfa53f4..3d0f2fa 100644
--- a/spec/yookassa/payment_spec.rb
+++ b/spec/yookassa/payment_spec.rb
@@ -1,104 +1,104 @@
 # frozen_string_literal: true
 
 RSpec.describe Yookassa::Payment do
-  let(:settings) { { shop_id: 'SHOP_ID', api_key: 'API_KEY' } }
+  let(:settings) { { shop_id: "SHOP_ID", api_key: "API_KEY" } }
   let(:idempotency_key) { 12_345 }
   let(:payment) { described_class.new(settings) }
 
-  shared_examples 'returns_payment_object' do
-    it 'returns success' do
+  shared_examples "returns_payment_object" do
+    it "returns success" do
       expect(subject).to be_kind_of Yookassa::Response
-      expect(subject.id).to eq '2490ded1-000f-5000-8000-1f64111bc63e'
+      expect(subject.id).to eq "2490ded1-000f-5000-8000-1f64111bc63e"
       expect(subject.test).to eq true
       expect(subject.paid).to eq false
-      expect(subject.status).to eq 'pending'
+      expect(subject.status).to eq "pending"
       expect(subject.captured_at).to eq nil
-      expect(subject.created_at).to eq '2019-06-10T21:26:41.395Z'
+      expect(subject.created_at).to eq "2019-06-10T21:26:41.395Z"
       expect(subject.description).to eq nil
       expect(subject.expires_at).to eq nil
-      expect(subject.metadata).to eq Hash[]
+      expect(subject.metadata).to eq({})
 
       expect(subject.amount).to be_kind_of Yookassa::Entity::Amount
-      expect(subject.amount.currency).to eq 'RUB'
+      expect(subject.amount.currency).to eq "RUB"
       expect(subject.amount.value).to eq 10.0
 
       expect(subject.confirmation).to be_kind_of Yookassa::Entity::Confirmation
-      expect(subject.confirmation.confirmation_url).to eq 'https://money.yookassa.ru/payments/external/confirmation?orderId=2490ded1-000f-5000-8000-1f64111bc63e'
-      expect(subject.confirmation.type).to eq 'redirect'
-      expect(subject.confirmation.return_url).to eq 'https://url.test'
+      expect(subject.confirmation.confirmation_url).to eq "https://money.yookassa.ru/payments/external/confirmation?orderId=2490ded1-000f-5000-8000-1f64111bc63e"
+      expect(subject.confirmation.type).to eq "redirect"
+      expect(subject.confirmation.return_url).to eq "https://url.test"
       expect(subject.confirmation.enforce).to eq nil
 
       expect(subject.payment_method).to be_kind_of Yookassa::Entity::PaymentMethod
       expect(subject.payment_method.card).to eq nil
-      expect(subject.payment_method.id).to eq '2490ded1-000f-5000-8000-1f64111bc63e'
+      expect(subject.payment_method.id).to eq "2490ded1-000f-5000-8000-1f64111bc63e"
       expect(subject.payment_method.saved).to eq false
-      expect(subject.payment_method.type).to eq 'bank_card'
+      expect(subject.payment_method.type).to eq "bank_card"
       expect(subject.payment_method.title).to eq nil
     end
   end
 
-  describe '#create' do
-    let(:params) { { payment: File.read('spec/fixtures/payment.json') } }
-    let(:url) { 'https://api.yookassa.ru/v3/payments' }
-    let(:body) { File.read('spec/fixtures/payment_response.json') }
+  describe "#create" do
+    let(:params) { { payment: File.read("spec/fixtures/payment.json") } }
+    let(:url) { "https://api.yookassa.ru/v3/payments" }
+    let(:body) { File.read("spec/fixtures/payment_response.json") }
 
     before  { stub_request(:any, //).to_return(body: body) }
     subject { payment.create(payment: params, idempotency_key: idempotency_key) }
 
-    it 'sends a request' do
+    it "sends a request" do
       subject
       expect(a_request(:post, url)).to have_been_made
     end
 
-    it_behaves_like 'returns_payment_object'
+    it_behaves_like "returns_payment_object"
   end
 
-  describe '#get_payment_info' do
-    let(:payment_id) { '2490ded1-000f-5000-8000-1f64111bc63e' }
+  describe "#get_payment_info" do
+    let(:payment_id) { "2490ded1-000f-5000-8000-1f64111bc63e" }
     let(:url) { "https://api.yookassa.ru/v3/payments/#{payment_id}" }
-    let(:body) { File.read('spec/fixtures/payment_response.json') }
+    let(:body) { File.read("spec/fixtures/payment_response.json") }
 
     before  { stub_request(:any, //).to_return(body: body) }
     subject { payment.get_payment_info(payment_id: payment_id) }
 
-    it 'sends a request' do
+    it "sends a request" do
       subject
       expect(a_request(:get, url)).to have_been_made
     end
 
-    it_behaves_like 'returns_payment_object'
+    it_behaves_like "returns_payment_object"
   end
 
-  describe '#capture' do
-    let(:payment_id) { '2490ded1-000f-5000-8000-1f64111bc63e' }
-    let(:params) { { payment: File.read('spec/fixtures/payment.json') } }
+  describe "#capture" do
+    let(:payment_id) { "2490ded1-000f-5000-8000-1f64111bc63e" }
+    let(:params) { { payment: File.read("spec/fixtures/payment.json") } }
     let(:url) { "https://api.yookassa.ru/v3/payments/#{payment_id}/capture" }
-    let(:body) { File.read('spec/fixtures/payment_response.json') }
+    let(:body) { File.read("spec/fixtures/payment_response.json") }
 
     before  { stub_request(:any, //).to_return(body: body) }
     subject { payment.capture(payment_id: payment_id, idempotency_key: idempotency_key) }
 
-    it 'sends a request' do
+    it "sends a request" do
       subject
       expect(a_request(:post, url)).to have_been_made
     end
 
-    it_behaves_like 'returns_payment_object'
+    it_behaves_like "returns_payment_object"
   end
 
-  describe '#cancel' do
-    let(:payment_id) { '2490ded1-000f-5000-8000-1f64111bc63e' }
+  describe "#cancel" do
+    let(:payment_id) { "2490ded1-000f-5000-8000-1f64111bc63e" }
     let(:url) { "https://api.yookassa.ru/v3/payments/#{payment_id}/cancel" }
-    let(:body) { File.read('spec/fixtures/payment_response.json') }
+    let(:body) { File.read("spec/fixtures/payment_response.json") }
 
     before  { stub_request(:any, //).to_return(body: body) }
     subject { payment.cancel(payment_id: payment_id, idempotency_key: idempotency_key) }
 
-    it 'sends a request' do
+    it "sends a request" do
       subject
       expect(a_request(:post, url)).to have_been_made
     end
 
-    it_behaves_like 'returns_payment_object'
+    it_behaves_like "returns_payment_object"
   end
 end
diff --git a/spec/yookassa/refund_spec.rb b/spec/yookassa/refund_spec.rb
index 5373e80..b1c6b7c 100644
--- a/spec/yookassa/refund_spec.rb
+++ b/spec/yookassa/refund_spec.rb
@@ -1,54 +1,54 @@
 # frozen_string_literal: true
 
 RSpec.describe Yookassa::Refund do
-  let(:settings) { { shop_id: 'SHOP_ID', api_key: 'API_KEY' } }
+  let(:settings) { { shop_id: "SHOP_ID", api_key: "API_KEY" } }
   let(:idempotency_key) { 12_345 }
   let(:payment) { described_class.new(settings) }
 
-  shared_examples 'returns_refund_object' do
-    it 'returns success' do
+  shared_examples "returns_refund_object" do
+    it "returns success" do
       expect(subject).to be_kind_of Yookassa::Response
-      expect(subject.id).to eq '2491ab0c-0015-5000-9000-1640c7f1a6f0'
-      expect(subject.payment_id).to eq '2491a6e2-000f-5000-9000-1480e820ae17'
-      expect(subject.status).to eq 'succeeded'
-      expect(subject.created_at).to eq '2019-06-11T11:58:04.502Z'
-      expect(subject.description).to eq 'test refund, idem-key 78c95366-ec4b-4284-a0fd-41e694bcdf11'
+      expect(subject.id).to eq "2491ab0c-0015-5000-9000-1640c7f1a6f0"
+      expect(subject.payment_id).to eq "2491a6e2-000f-5000-9000-1480e820ae17"
+      expect(subject.status).to eq "succeeded"
+      expect(subject.created_at).to eq "2019-06-11T11:58:04.502Z"
+      expect(subject.description).to eq "test refund, idem-key 78c95366-ec4b-4284-a0fd-41e694bcdf11"
 
       expect(subject.amount).to be_kind_of Yookassa::Entity::Amount
-      expect(subject.amount.currency).to eq 'RUB'
+      expect(subject.amount.currency).to eq "RUB"
       expect(subject.amount.value).to eq 8.0
     end
   end
 
-  describe '#create' do
-    let(:payload) { File.read('spec/fixtures/refund.json') }
-    let(:url) { 'https://api.yookassa.ru/v3/refunds' }
-    let(:body) { File.read('spec/fixtures/refund_response.json') }
+  describe "#create" do
+    let(:payload) { File.read("spec/fixtures/refund.json") }
+    let(:url) { "https://api.yookassa.ru/v3/refunds" }
+    let(:body) { File.read("spec/fixtures/refund_response.json") }
 
     before  { stub_request(:any, //).to_return(body: body) }
     subject { payment.create(payload: payload, idempotency_key: idempotency_key) }
 
-    it 'sends a request' do
+    it "sends a request" do
       subject
       expect(a_request(:post, url)).to have_been_made
     end
 
-    it_behaves_like 'returns_refund_object'
+    it_behaves_like "returns_refund_object"
   end
 
-  describe '#get_refund_info' do
-    let(:payment_id) { '2490ded1-000f-5000-8000-1f64111bc63e' }
+  describe "#get_refund_info" do
+    let(:payment_id) { "2490ded1-000f-5000-8000-1f64111bc63e" }
     let(:url) { "https://api.yookassa.ru/v3/refunds/#{payment_id}" }
-    let(:body) { File.read('spec/fixtures/refund_response.json') }
+    let(:body) { File.read("spec/fixtures/refund_response.json") }
 
     before  { stub_request(:any, //).to_return(body: body) }
     subject { payment.get_refund_info(payment_id: payment_id) }
 
-    it 'sends a request' do
+    it "sends a request" do
       subject
       expect(a_request(:get, url)).to have_been_made
     end
 
-    it_behaves_like 'returns_refund_object'
+    it_behaves_like "returns_refund_object"
   end
 end
diff --git a/spec/yookassa_spec.rb b/spec/yookassa_spec.rb
index c08df3a..ced91d5 100644
--- a/spec/yookassa_spec.rb
+++ b/spec/yookassa_spec.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 RSpec.describe Yookassa do
-  it 'has a version number' do
+  it "has a version number" do
     expect(Yookassa::VERSION).not_to be nil
   end
 end
diff --git a/yookassa.gemspec b/yookassa.gemspec
index b375d76..ef95cd9 100644
--- a/yookassa.gemspec
+++ b/yookassa.gemspec
@@ -1,32 +1,32 @@
 # frozen_string_literal: true
 
-lib = File.expand_path('lib', __dir__)
+lib = File.expand_path("lib", __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require 'yookassa/version'
+require "yookassa/version"
 
 Gem::Specification.new do |spec|
-  spec.name          = 'yookassa'
+  spec.name          = "yookassa"
   spec.version       = Yookassa::VERSION
-  spec.authors       = 'Andrey Paderin'
-  spec.email         = 'andy.paderin@gmail.com'
+  spec.authors       = "Andrey Paderin"
+  spec.email         = "andy.paderin@gmail.com"
 
-  spec.summary       = 'This product is used for managing payments under The Yookassa API For usage by those who implemented Yookassa using the API method.'
-  spec.homepage      = 'https://github.com/paderinandrey/yookassa'
-  spec.license       = 'MIT'
+  spec.summary       = "Yookassa API SDK for Ruby"
+  spec.homepage      = "https://github.com/paderinandrey/yookassa"
+  spec.license       = "MIT"
 
   spec.files            = `git ls-files`.split($INPUT_RECORD_SEPARATOR)
   spec.test_files       = spec.files.grep(/^spec/)
-  spec.extra_rdoc_files = Dir['README.md', 'LICENSE', 'CHANGELOG.md']
+  spec.extra_rdoc_files = Dir["README.md", "LICENSE", "CHANGELOG.md"]
 
-  spec.require_paths = ['lib']
+  spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = '>= 2.5'
+  spec.required_ruby_version = ">= 2.6"
 
-  spec.add_runtime_dependency 'evil-client', '~> 3.0'
+  spec.add_runtime_dependency "evil-client", "~> 3.0"
 
-  spec.add_development_dependency 'rake', '>= 10.0'
-  spec.add_development_dependency 'rspec', '~> 3.5'
-  spec.add_development_dependency 'rubocop', '~> 0.71'
-  spec.add_development_dependency 'simplecov', '~> 0.16'
-  spec.add_development_dependency 'webmock', '~> 3.5'
+  spec.add_development_dependency "rake", ">= 10.0"
+  spec.add_development_dependency "rspec", "~> 3.5"
+  spec.add_development_dependency "rubocop", "~> 0.71"
+  spec.add_development_dependency "simplecov", "~> 0.16"
+  spec.add_development_dependency "webmock", "~> 3.5"
 end