diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..18c633d
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,367 @@
+require:
+  - rubocop-disable_syntax
+
+plugins:
+  - rubocop-performance
+  - rubocop-rake
+  - rubocop-rspec
+
+AllCops:
+  TargetRubyVersion: 3.1
+  NewCops: enable
+
+# We use standard as a linter and formatter instead Rubocop.
+# Also, we are explicitly disable all rubocop rules what
+# already enabled in standard. And standard-performance.
+
+# Standard rules. Style:
+
+# Enforced by standard. Disable.
+Style/StringLiterals:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/HashSyntax:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/NestedParenthesizedCalls:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/RedundantRegexpArgument:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/PercentLiteralDelimiters:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/RedundantBegin:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/SuperWithArgsParentheses:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/Encoding:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/NumericLiteralPrefix:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/RedundantParentheses:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/EmptyMethod:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/SingleLineMethods:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/SafeNavigation:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/RescueStandardError:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/RedundantSelf:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/TernaryParentheses:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/RedundantLineContinuation:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/SlicingWithRange:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/MultilineIfModifier:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/RedundantCondition:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/RedundantInterpolation:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/OrAssignment:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/ConditionalAssignment:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/ItAssignment:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/EachWithObject:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/GlobalStdStream:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/StringLiteralsInInterpolation:
+  Enabled: false
+
+# Disabled as in standard.
+Style/HashAsLastArrayItem:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Style/Alias:
+  Enabled: false
+
+# Standard rules. Layout:
+
+# Enforced by standard. Disable.
+Layout/HashAlignment:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/FirstArrayElementIndentation:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/SpaceInsideHashLiteralBraces:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/SpaceInsideStringInterpolation:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/DotPosition:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/ExtraSpacing:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/ArgumentAlignment:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/MultilineMethodCallBraceLayout:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/AccessModifierIndentation:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/FirstHashElementIndentation:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/IndentationWidth:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/ElseAlignment:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/EndAlignment:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/MultilineHashBraceLayout:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/EmptyLineBetweenDefs:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/MultilineArrayBraceLayout:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/EmptyLineAfterMagicComment:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/SpaceAroundOperators:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/ArrayAlignment:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/AssignmentIndentation:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/ClosingParenthesisIndentation:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/LineLength:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/MultilineMethodCallIndentation:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Layout/CaseIndentation:
+  Enabled: false
+
+# Standard rules. Lint:
+
+# Enforced by standard. Disable.
+Lint/ImplicitStringConcatenation:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Lint/TripleQuotes:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Lint/IneffectiveAccessModifier:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Lint/SymbolConversion:
+  Enabled: false
+
+# Enforced by rubocop and standard
+Lint/CopDirectiveSyntax:
+  Enabled: true
+
+# Enforced by standard. Disable.
+Lint/DuplicateMethods:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Lint/ConstantDefinitionInBlock:
+  Enabled: false
+
+# Enforced by standard. Disable.
+Lint/UselessTimes:
+  Enabled: false
+
+# Standard-performance rules.
+
+# Enforced by standard-performance. Disable.
+Performance/Detect:
+  Enabled: false
+
+# Enforced by standard-performance. Disable.
+Performance/StringIdentifierArgument:
+  Enabled: false
+
+# Enforced by standard-performance. Disable.
+Performance/RegexpMatch:
+  Enabled: false
+
+# Always enable rubocop Security:
+
+# Enforced by rubocop and standard
+Security/JSONLoad:
+  Enabled: true
+
+# Our rubocop rules
+
+# Bundler rules.
+
+Bundler/OrderedGems:
+  Enabled: false
+
+# Gemspec rules
+
+Gemspec/OrderedDependencies:
+  Enabled: false
+
+# Style rules
+
+# Don't allow %i[foo bar baz]
+Style/SymbolArray:
+  Enabled: true
+  EnforcedStyle: brackets
+
+# Don't allow %w[foo bar baz]
+Style/WordArray:
+  Enabled: true
+  EnforcedStyle: brackets
+
+# Disable warnings like "Missing top-level documentation comment for"
+Style/Documentation:
+  Enabled: false
+
+# Disable as in standard.
+Style/ArgumentsForwarding:
+  Enabled: false
+
+# RSpec rules
+
+# Prefer eq over be.
+RSpec/BeEq:
+  Enabled: false
+
+# Prefer eq over eql.
+RSpec/BeEql:
+  Enabled: false
+
+# We prefer to use `expect` over `allow`.
+RSpec/StubbedMock:
+  Enabled: false
+
+# We prefer multiple before blocks in tests.
+RSpec/ScatteredSetup:
+  Enabled: false
+
+# We use `expect` in before hooks.
+RSpec/ExpectInHook:
+  Enabled: false
+
+# We use item_1, item_2, etc. Disable.
+RSpec/IndexedLet:
+  Enabled: false
+
+# We don't use named subject's
+RSpec/NamedSubject:
+  Enabled: false
+
+# Naming rules:
+
+# Disable anonymous block forwarding.
+Naming/BlockForwarding:
+  Enabled: true
+  EnforcedStyle: explicit
+
+# Enable and exclude specific files.
+Naming/FileName:
+  Enabled: true
+
+# Disabled syntax:
+
+# Disable shorthand hash syntax like: ({ x:, y: })
+# Disable % style literals
+Style/DisableSyntax:
+  DisableSyntax:
+    - shorthand_hash_syntax
+    - percent_literals
diff --git a/Gemfile b/Gemfile
index d910056..e96b574 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,5 +4,12 @@ source "https://rubygems.org"
 
 gemspec
 
+gem "rake"
+gem "rspec"
 gem "simplecov", require: false
-gem "standard"
+gem "standard", require: false
+gem "rubocop", require: false
+gem "rubocop-disable_syntax", require: false
+gem "rubocop-performance", require: false
+gem "rubocop-rake", require: false
+gem "rubocop-rspec", require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 687435e..3a4247c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,9 @@ PATH
   remote: .
   specs:
     errbit_github_plugin (0.4.0)
+      activesupport
       errbit_plugin
+      faraday-retry
       octokit
 
 GEM
@@ -39,6 +41,8 @@ GEM
       logger
     faraday-net_http (3.4.0)
       net-http (>= 0.5.0)
+    faraday-retry (2.3.1)
+      faraday (~> 2.0)
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
     json (2.10.2)
@@ -90,10 +94,18 @@ GEM
     rubocop-ast (1.44.0)
       parser (>= 3.3.7.2)
       prism (~> 1.4)
+    rubocop-disable_syntax (0.1.1)
+      rubocop (>= 1.50)
     rubocop-performance (1.25.0)
       lint_roller (~> 1.1)
       rubocop (>= 1.75.0, < 2.0)
       rubocop-ast (>= 1.38.0, < 2.0)
+    rubocop-rake (0.7.1)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.72.1)
+    rubocop-rspec (3.5.0)
+      lint_roller (~> 1.1)
+      rubocop (~> 1.72, >= 1.72.1)
     ruby-progressbar (1.13.0)
     sawyer (0.9.2)
       addressable (>= 2.3.5)
@@ -139,10 +151,14 @@ PLATFORMS
   x86_64-linux-musl
 
 DEPENDENCIES
-  activesupport
   errbit_github_plugin!
   rake
   rspec
+  rubocop
+  rubocop-disable_syntax
+  rubocop-performance
+  rubocop-rake
+  rubocop-rspec
   simplecov
   standard
 
diff --git a/errbit_github_plugin.gemspec b/errbit_github_plugin.gemspec
index 4c39511..9b74f2d 100644
--- a/errbit_github_plugin.gemspec
+++ b/errbit_github_plugin.gemspec
@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
-lib = File.expand_path("../lib", __FILE__)
-$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require "errbit_github_plugin/version"
+require_relative "lib/errbit_github_plugin/version"
 
 Gem::Specification.new do |spec|
   spec.name = "errbit_github_plugin"
@@ -10,19 +8,28 @@ Gem::Specification.new do |spec|
   spec.authors = ["Stephen Crosby"]
   spec.email = ["stevecrozz@gmail.com"]
 
-  spec.description = "GitHub integration for Errbit"
   spec.summary = "GitHub integration for Errbit"
+  spec.description = "GitHub integration for Errbit"
   spec.homepage = "https://github.com/errbit/errbit_github_plugin"
   spec.license = "MIT"
+  spec.required_ruby_version = ">= 3.1.0"
 
-  spec.files = `git ls-files`.split($/)
-  spec.executables = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = spec.homepage
+
+  # Specify which files should be added to the gem when it is released.
+  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
+  gemspec = File.basename(__FILE__)
+  spec.files = IO.popen(["git", "ls-files", "-z"], chdir: __dir__, err: IO::NULL) do |ls|
+    ls.readlines("\x0", chomp: true).reject do |f|
+      (f == gemspec) ||
+        f.start_with?("bin/", "test/", "spec/", "features/", ".git", ".github", "appveyor", "Gemfile")
+    end
+  end
   spec.require_paths = ["lib"]
 
   spec.add_dependency "errbit_plugin"
+  spec.add_dependency "faraday-retry"
   spec.add_dependency "octokit"
-
-  spec.add_development_dependency "rspec"
-  spec.add_development_dependency "rake"
-  spec.add_development_dependency "activesupport"
+  spec.add_dependency "activesupport"
 end
diff --git a/lib/errbit_github_plugin.rb b/lib/errbit_github_plugin.rb
index 0a17647..57afb5a 100644
--- a/lib/errbit_github_plugin.rb
+++ b/lib/errbit_github_plugin.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 require "errbit_github_plugin/version"
-require "errbit_github_plugin/error"
+require "errbit_github_plugin/authentication_error"
 require "errbit_github_plugin/issue_tracker"
 
 module ErrbitGithubPlugin
diff --git a/lib/errbit_github_plugin/error.rb b/lib/errbit_github_plugin/authentication_error.rb
similarity index 100%
rename from lib/errbit_github_plugin/error.rb
rename to lib/errbit_github_plugin/authentication_error.rb
diff --git a/lib/errbit_github_plugin/issue_tracker.rb b/lib/errbit_github_plugin/issue_tracker.rb
index fbfe57c..106e1ad 100644
--- a/lib/errbit_github_plugin/issue_tracker.rb
+++ b/lib/errbit_github_plugin/issue_tracker.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "active_support/core_ext/object/blank"
 require "octokit"
 
 module ErrbitGithubPlugin
@@ -57,12 +58,15 @@ def url
 
     def errors
       errors = []
+
       if self.class.fields.detect { |f| options[f[0]].blank? }
         errors << [:base, "You must specify your GitHub username and password"]
       end
+
       if repo.blank?
         errors << [:base, "You must specify your GitHub repository url."]
       end
+
       errors
     end
 
@@ -86,6 +90,9 @@ def create_issue(title, body, user: {})
       raise ErrbitGithubPlugin::AuthenticationError, "Could not authenticate with GitHub. Please check your username and password."
     end
 
+    # @param url [String]
+    # @param user [Hash]
+    # @return [String] The URL of the closed issue
     def close_issue(url, user: {})
       github_client = if user["github_login"] && user["github_oauth_token"]
         Octokit::Client.new(
diff --git a/spec/errbit_github_plugin/issue_tracker_spec.rb b/spec/errbit_github_plugin/issue_tracker_spec.rb
index 921fb7d..a6a9a88 100644
--- a/spec/errbit_github_plugin/issue_tracker_spec.rb
+++ b/spec/errbit_github_plugin/issue_tracker_spec.rb
@@ -4,43 +4,48 @@
 
 RSpec.describe ErrbitGithubPlugin::IssueTracker do
   describe ".label" do
-    it "return LABEL" do
-      expect(described_class.label).to eq described_class::LABEL
-    end
+    it { expect(described_class.label).to eq("github") }
   end
 
   describe ".note" do
-    it "return NOTE" do
-      expect(described_class.note).to eq described_class::NOTE
-    end
+    it { expect(described_class.note).to start_with("Please configure your GitHub") }
   end
 
   describe ".fields" do
-    it "return FIELDS" do
-      expect(described_class.fields).to eq described_class::FIELDS
+    it do
+      expect(described_class.fields).to eq(
+        {
+          username: {
+            placeholder: "Your username on GitHub"
+          },
+          password: {
+            placeholder: "Password for your account"
+          }
+        }
+      )
     end
   end
 
   describe ".icons" do
     it "puts create icon onto the icons" do
-      expect(described_class.icons[:create][0]).to eq "image/png"
-      expect(
-        described_class.icons[:create][1]
-      ).to eq ErrbitGithubPlugin.read_static_file("github_create.png")
+      expect(described_class.icons[:create][0]).to eq("image/png")
+
+      expect(described_class.icons[:create][1])
+        .to eq(ErrbitGithubPlugin.read_static_file("github_create.png"))
     end
 
     it "puts goto icon onto the icons" do
-      expect(described_class.icons[:goto][0]).to eq "image/png"
-      expect(
-        described_class.icons[:goto][1]
-      ).to eq ErrbitGithubPlugin.read_static_file("github_goto.png")
+      expect(described_class.icons[:goto][0]).to eq("image/png")
+
+      expect(described_class.icons[:goto][1])
+        .to eq(ErrbitGithubPlugin.read_static_file("github_goto.png"))
     end
 
     it "puts inactive icon onto the icons" do
-      expect(described_class.icons[:inactive][0]).to eq "image/png"
-      expect(
-        described_class.icons[:inactive][1]
-      ).to eq ErrbitGithubPlugin.read_static_file("github_inactive.png")
+      expect(described_class.icons[:inactive][0]).to eq("image/png")
+
+      expect(described_class.icons[:inactive][1])
+        .to eq(ErrbitGithubPlugin.read_static_file("github_inactive.png"))
     end
   end
 
@@ -49,70 +54,86 @@
   describe "#configured?" do
     context "with errors" do
       let(:options) { {invalid_key: ""} }
+
       it "return false" do
-        expect(tracker.configured?).to eq false
+        expect(tracker.configured?).to eq(false)
       end
     end
+
     context "without errors" do
       let(:options) do
-        {username: "foo", password: "bar", github_repo: "user/repos"}
+        {username: "foo", password: "bar", github_repo: "user/repository"}
       end
+
       it "return true" do
-        expect(tracker.configured?).to eq true
+        expect(tracker.configured?).to eq(true)
       end
     end
   end
 
   describe "#url" do
-    let(:options) { {github_repo: "repo"} }
+    let(:options) { {github_repo: "user/repo"} }
+
     it "returns issues url" do
-      expect(tracker.url).to eq "https://github.com/repo/issues"
+      expect(tracker.url).to eq("https://github.com/user/repo/issues")
     end
   end
 
   describe "#errors" do
     subject { tracker.errors }
+
     context "without username" do
       let(:options) { {username: "", password: "bar", github_repo: "repo"} }
+
       it { is_expected.not_to be_empty }
     end
+
     context "without password" do
       let(:options) do
         {username: "", password: "bar", github_repo: "repo"}
       end
+
       it { is_expected.not_to be_empty }
     end
+
     context "without github_repo" do
       let(:options) do
         {username: "foo", password: "bar", github_repo: ""}
       end
+
       it { is_expected.not_to be_empty }
     end
+
     context "with completed options" do
       let(:options) do
         {username: "foo", password: "bar", github_repo: "repo"}
       end
+
       it { is_expected.to be_empty }
     end
   end
 
   describe "#repo" do
     let(:options) { {github_repo: "baz"} }
+
     it "returns github repo" do
-      expect(tracker.repo).to eq "baz"
+      expect(tracker.repo).to eq("baz")
     end
   end
 
   describe "#create_issue" do
     subject { tracker.create_issue("title", "body", user: user) }
+
     let(:options) do
       {username: "foo", password: "bar", github_repo: "user/repos"}
     end
+
     let(:fake_github_client) do
       double("Fake GitHub Client").tap do |github_client|
         expect(github_client).to receive(:create_issue).and_return(fake_issue)
       end
     end
+
     let(:fake_issue) do
       double("Fake Issue").tap do |issue|
         expect(issue).to receive(:html_url).and_return("http://github.com/user/repos/issues/878").twice
@@ -126,21 +147,25 @@
           "github_oauth_token" => "valid_token"
         }
       end
+
       it "return issue url" do
         expect(Octokit::Client).to receive(:new).with(
           login: user["github_login"], access_token: user["github_oauth_token"]
         ).and_return(fake_github_client)
-        expect(subject).to eq fake_issue.html_url
+
+        expect(subject).to eq(fake_issue.html_url)
       end
     end
 
     context "signed in with password" do
       let(:user) { {} }
+
       it "return issue url" do
         expect(Octokit::Client).to receive(:new).with(
           login: options["username"], password: options["password"]
         ).and_return(fake_github_client)
-        expect(subject).to eq fake_issue.html_url
+
+        expect(subject).to eq(fake_issue.html_url)
       end
     end
 
@@ -148,10 +173,75 @@
       let(:user) do
         {"github_login" => "alice", "github_oauth_token" => "invalid_token"}
       end
+
       it "raise AuthenticationError" do
         expect(Octokit::Client).to receive(:new).with(
           login: user["github_login"], access_token: user["github_oauth_token"]
         ).and_raise(Octokit::Unauthorized)
+
+        expect { subject }.to raise_error(ErrbitGithubPlugin::AuthenticationError)
+      end
+    end
+  end
+
+  describe "#close_issue" do
+    subject { tracker.close_issue("url", user: user) }
+
+    let(:options) do
+      {username: "foo", password: "bar", github_repo: "user/repository"}
+    end
+
+    let(:fake_github_client) do
+      double("Fake GitHub Client").tap do |github_client|
+        expect(github_client).to receive(:close_issue).and_return(fake_issue)
+      end
+    end
+
+    let(:fake_issue) do
+      double("Fake Issue").tap do |issue|
+        expect(issue).to receive(:html_url).and_return("http://github.com/user/repos/issues/878").twice
+      end
+    end
+
+    context "signed in with token" do
+      let(:user) do
+        {
+          "github_login" => "bob",
+          "github_oauth_token" => "valid_token"
+        }
+      end
+
+      it "return issue url" do
+        expect(Octokit::Client).to receive(:new).with(
+          login: user["github_login"], access_token: user["github_oauth_token"]
+        ).and_return(fake_github_client)
+
+        expect(subject).to eq(fake_issue.html_url)
+      end
+    end
+
+    context "signed in with password" do
+      let(:user) { {} }
+
+      it "return issue url" do
+        expect(Octokit::Client).to receive(:new).with(
+          login: options["username"], password: options["password"]
+        ).and_return(fake_github_client)
+
+        expect(subject).to eq(fake_issue.html_url)
+      end
+    end
+
+    context "when unauthentication error" do
+      let(:user) do
+        {"github_login" => "alice", "github_oauth_token" => "invalid_token"}
+      end
+      #
+      it "raise AuthenticationError" do
+        expect(Octokit::Client).to receive(:new).with(
+          login: user["github_login"], access_token: user["github_oauth_token"]
+        ).and_raise(Octokit::Unauthorized)
+
         expect { subject }.to raise_error(ErrbitGithubPlugin::AuthenticationError)
       end
     end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 05f63c8..e5b39a9 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -6,11 +6,12 @@
   enable_coverage :branch
 
   primary_coverage :branch
+
+  add_filter "spec/"
 end
 
 require "errbit_plugin"
 require "errbit_github_plugin"
-require "active_support/all"
 
 RSpec.configure do |config|
   # Enable flags like --only-failures and --next-failure