diff --git a/.codeclimate.yml b/.codeclimate.yml
deleted file mode 100644
index 6823e1f7..00000000
--- a/.codeclimate.yml
+++ /dev/null
@@ -1,21 +0,0 @@
----
-engines:
-  duplication:
-    enabled: true
-    config:
-      languages:
-      - ruby
-  fixme:
-    enabled: true
-  rubocop:
-    enabled: true
-  bundler-audit:
-    enabled: true
-ratings:
-  paths:
-  - "**.rb"
-exclude_paths:
-- examples/
-- gemfiles/
-- spec/
-- test/
diff --git a/.github/workflows/test-and-deploy.yml b/.github/workflows/test-and-deploy.yml
new file mode 100644
index 00000000..500e990b
--- /dev/null
+++ b/.github/workflows/test-and-deploy.yml
@@ -0,0 +1,115 @@
+name: Test and Deploy
+on:
+  push:
+    branches: [ '*' ]
+    tags: [ '*' ]
+  pull_request:
+    branches: [ main ]
+  schedule:
+    # Run automatically at 8AM PST Monday-Friday
+    - cron: '0 15 * * 1-5'
+  workflow_dispatch:
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    strategy:
+      matrix:
+        ruby: [ '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', 'jruby-9.2' ]
+    env:
+      version: ${{ format('ruby:{0}', matrix.ruby) }}
+      DOCKER_LOGIN: ${{ secrets.DOCKER_USERNAME && secrets.DOCKER_AUTH_TOKEN }}
+    steps:
+      - name: Revise env version if necessary
+        run: echo "version=jruby:9.2" >> $GITHUB_ENV
+        if: ${{ matrix.ruby == 'jruby-9.2' }}
+
+      - name: Checkout sendgrid-ruby
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Login to Docker Hub
+        if: env.DOCKER_LOGIN
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_AUTH_TOKEN }}
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+
+      - run: make install
+
+      - name: Set up linter
+        run: bundle add rubocop --version "~> 1.24.1" --group "development" --skip-install
+        if: ${{ matrix.ruby != '2.4' }}
+
+      - run: bundle install --with development
+
+      - name: Run linter
+        run: bundle exec rubocop
+        if: ${{ matrix.ruby != '2.4' }}
+
+      - name: Run tests
+        run: make test-docker
+
+  deploy:
+    name: Deploy
+    if: success() && github.ref_type == 'tag'
+    needs: [ test ]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sendgrid-ruby
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.1
+          bundler-cache: true
+
+      - run: make install
+
+      - name: Create GitHub Release
+        uses: sendgrid/dx-automator/actions/release@main
+        with:
+          footer: '**[RubyGems](https://rubygems.org/gems/sendgrid-ruby/versions/${version})**'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Publish to Rubygems
+        env:
+          GEM_HOST_API_KEY: ${{ secrets.RUBYGEMS_AUTH_TOKEN }}
+        run: |
+          mkdir -p $HOME/.gem
+          touch $HOME/.gem/credentials
+          chmod 0600 $HOME/.gem/credentials
+          printf -- "---\n:rubygems_api_key: ${GEM_HOST_API_KEY}\n" > $HOME/.gem/credentials
+          gem build *.gemspec
+          gem push *.gem
+
+  notify-on-failure:
+    name: Slack notify on failure
+    if: failure() && github.event_name != 'pull_request' && (github.ref == 'refs/heads/main' || github.ref_type == 'tag')
+    needs: [ test, deploy ]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: rtCamp/action-slack-notify@v2
+        env:
+          SLACK_COLOR: failure
+          SLACK_ICON_EMOJI: ':github:'
+          SLACK_MESSAGE: ${{ format('Test *{0}*, Deploy *{1}*, {2}/{3}/actions/runs/{4}', needs.test.result, needs.deploy.result, github.server_url, github.repository, github.run_id) }}
+          SLACK_TITLE: Action Failure - ${{ github.repository }}
+          SLACK_USERNAME: GitHub Actions
+          SLACK_MSG_AUTHOR: twilio-dx
+          SLACK_FOOTER: Posted automatically using GitHub Actions
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+          MSG_MINIMAL: true
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index c7914181..813e62f4 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,11 +1,19 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2020-09-18 20:20:54 UTC using RuboCop version 0.91.0.
+# on 2022-01-25 23:45:43 UTC using RuboCop version 1.22.2.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: TreatCommentsAsGroupSeparators, ConsiderPunctuation, Include.
+# Include: **/*.gemfile, **/Gemfile, **/gems.rb
+Bundler/OrderedGems:
+  Exclude:
+    - 'Gemfile'
+
 # Offense count: 1
 # Configuration parameters: Include.
 # Include: **/*.gemspec
@@ -13,37 +21,37 @@ Gemspec/RequiredRubyVersion:
   Exclude:
     - 'sendgrid-ruby.gemspec'
 
-# Offense count: 22
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: final_newline, final_blank_line
+Layout/TrailingEmptyLines:
+  Exclude:
+    - 'Gemfile'
+
+# Offense count: 24
 Lint/UselessAssignment:
   Exclude:
     - 'examples/scopes/scopes.rb'
     - 'spec/rack/sendgrid_webhook_verification_spec.rb'
 
-# Offense count: 8
-# Configuration parameters: IgnoredMethods.
+# Offense count: 10
+# Configuration parameters: IgnoredMethods, CountRepeatedAttributes.
 Metrics/AbcSize:
-  Max: 144
-
-# Offense count: 9
-# Configuration parameters: CountComments, CountAsOne, ExcludedMethods.
-# ExcludedMethods: refine
-Metrics/BlockLength:
-  Max: 96
+  Max: 134
 
 # Offense count: 3
 # Configuration parameters: CountComments, CountAsOne.
 Metrics/ClassLength:
-  Max: 2006
-  Exclude:
-    - 'test/sendgrid/test_sendgrid-ruby.rb'
+  Max: 2018
 
-# Offense count: 41
-# Configuration parameters: CountComments, CountAsOne, ExcludedMethods.
+# Offense count: 45
+# Configuration parameters: CountComments, CountAsOne, ExcludedMethods, IgnoredMethods.
 Metrics/MethodLength:
   Max: 141
 
-# Offense count: 2
-# Configuration parameters: CountKeywordArgs.
+# Offense count: 4
+# Configuration parameters: CountKeywordArgs, MaxOptionalParameters.
 Metrics/ParameterLists:
   Max: 7
 
@@ -76,15 +84,15 @@ Naming/PredicateName:
     - 'examples/helpers/eventwebhook/example.rb'
 
 # Offense count: 35
+# Configuration parameters: AllowedConstants.
 Style/Documentation:
   Enabled: false
 
-# Offense count: 4
-# Configuration parameters: EnforcedStyle.
+# Offense count: 3
+# Configuration parameters: MaxUnannotatedPlaceholdersAllowed, IgnoredMethods.
 # SupportedStyles: annotated, template, unannotated
 Style/FormatStringToken:
-  Exclude:
-    - 'examples/emailactivity/emailactivity.rb'
+  EnforcedStyle: unannotated
 
 # Offense count: 97
 # Cop supports --auto-correct.
@@ -93,6 +101,14 @@ Style/FormatStringToken:
 Style/FrozenStringLiteralComment:
   Enabled: false
 
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, UseHashRocketsWithSymbolValues, PreferHashRocketsForNonAlnumEndingSymbols.
+# SupportedStyles: ruby19, hash_rockets, no_mixed_keys, ruby19_no_mixed_keys
+Style/HashSyntax:
+  Exclude:
+    - 'Gemfile'
+
 # Offense count: 6
 Style/MixinUsage:
   Exclude:
@@ -103,9 +119,9 @@ Style/MixinUsage:
     - 'test/sendgrid/helpers/mail/test_attachment.rb'
     - 'test/sendgrid/helpers/mail/test_mail.rb'
 
-# Offense count: 55
+# Offense count: 54
 # Cop supports --auto-correct.
-# Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
+# Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
 # URISchemes: http, https
 Layout/LineLength:
-  Max: 3211
+  Max: 381
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index ebb65bb1..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,31 +0,0 @@
-language: ruby
-env:
-- version=ruby:3.0
-- version=ruby:2.7
-- version=ruby:2.6
-- version=ruby:2.5
-- version=ruby:2.4
-- version=jruby:9.2
-gemfile:
-- gemfiles/Sinatra_1.gemfile
-- gemfiles/Sinatra_2.gemfile
-script:
-- if [[ "$TRAVIS_BRANCH" == "main"  ||  "$TRAVIS_BRANCH" == "travis" ]] && [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
-  echo "${DOCKER_PASSWORD}" | docker login -u "${DOCKER_USERNAME}" --password-stdin;
-  fi
-- make test-docker
-deploy:
-  provider: rubygems
-  api_key: "$RUBYGEMS_API_KEY"
-  gem: sendgrid-ruby
-  on:
-    tags: true
-    condition: $version = ruby:2.4 && $BUNDLE_GEMFILE = *"gemfiles/Sinatra_1.gemfile"
-notifications:
-  slack:
-    if: branch = main
-    on_pull_requests: false
-    on_success: never
-    on_failure: change
-    rooms:
-      secure: oSeohwM+ernyiRYSRLpNlICk0wgj0lku3y5LuouJLRHs45tCAzLZLbgxsor18wCSJkmhfn2vg4Rn969VnskFuj70OhJSLBKL4UXBnR1Ji0ClpfJlGojcbY/5Z8N/eGDrvf5ofA0Jc+L/ut+oSCMXnstEGbx4wBpPTajHuRtvb34=
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9998c995..e1aaa23f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,17 @@
 # Change Log
 All notable changes to this project will be documented in this file.
 
+[2022-02-09] Version 6.6.1
+--------------------------
+**Library - Chore**
+- [PR #482](https://github.com/sendgrid/sendgrid-ruby/pull/482): upgrade supported language versions. Thanks to [@childish-sambino](https://github.com/childish-sambino)!
+- [PR #480](https://github.com/sendgrid/sendgrid-ruby/pull/480): add gh release to workflow. Thanks to [@shwetha-manvinkurke](https://github.com/shwetha-manvinkurke)!
+- [PR #478](https://github.com/sendgrid/sendgrid-ruby/pull/478): migrate to gh actions. Thanks to [@beebzz](https://github.com/beebzz)!
+
+**Library - Fix**
+- [PR #479](https://github.com/sendgrid/sendgrid-ruby/pull/479): set version env var for tests. Thanks to [@beebzz](https://github.com/beebzz)!
+
+
 [2021-11-03] Version 6.6.0
 --------------------------
 **Library - Feature**
diff --git a/LICENSE b/LICENSE
index e5439a92..5db04ff6 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (C) 2021, Twilio SendGrid, Inc. <help@twilio.com>
+Copyright (C) 2022, Twilio SendGrid, Inc. <help@twilio.com>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in
diff --git a/Makefile b/Makefile
index faee8997..c35f356a 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,6 @@ install:
 
 test:
 	bundle exec rake
-	rubocop
 
 test-integ: test
 
diff --git a/README.md b/README.md
index bcc45efc..5de9faa2 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 ![Twilio SendGrid Logo](twilio_sendgrid_logo.png)
 
-[![Travis Badge](https://travis-ci.com/sendgrid/sendgrid-ruby.svg?branch=main)](https://travis-ci.com/sendgrid/sendgrid-ruby)
+[![Travis Badge](https://github.com/sendgrid/sendgrid-ruby/actions/workflows/test-and-deploy.yml/badge.svg)](https://github.com/sendgrid/sendgrid-ruby/actions/workflows/test-and-deploy.yml)
 [![Gem Version](https://badge.fury.io/rb/sendgrid-ruby.svg)](https://badge.fury.io/rb/sendgrid-ruby)
 [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 [![Twitter Follow](https://img.shields.io/twitter/follow/sendgrid.svg?style=social&label=Follow)](https://twitter.com/sendgrid)
diff --git a/examples/new_marketing_campaigns/contacts.rb b/examples/new_marketing_campaigns/contacts.rb
new file mode 100644
index 00000000..b41b4bb0
--- /dev/null
+++ b/examples/new_marketing_campaigns/contacts.rb
@@ -0,0 +1,29 @@
+require 'sendgrid-ruby'
+
+sg = SendGrid::API.new(api_key: ENV['SENDGRID_API_KEY'])
+
+##################################################
+# Add or Update a Contact #
+# POST /marketing/contacts #
+
+data = JSON.parse('{
+  "list_ids": [
+    "ca7a3796-e8a8-4029-9ccb-df8937940562"
+  ],
+  "contacts": [
+    {
+      "address_line_1": "123 Elm St.",
+      "address_line_2": "Apt. 456",
+      "city": "Denver",
+      "country": "United States",
+      "email": "example@example.com",
+      "first_name": "User",
+      "last_name": "Example"
+    }
+  ]
+}')
+
+response = sg.client.marketing.contacts.put(request_body: data)
+puts response.status_code
+puts response.body
+puts response.headers
diff --git a/examples/new_marketing_campaigns/customfields.rb b/examples/new_marketing_campaigns/customfields.rb
new file mode 100644
index 00000000..de1a35fb
--- /dev/null
+++ b/examples/new_marketing_campaigns/customfields.rb
@@ -0,0 +1,49 @@
+require 'sendgrid-ruby'
+
+sg = SendGrid::API.new(api_key: ENV['SENDGRID_API_KEY'])
+
+##################################################
+# Create Custom Field Definition #
+# POST /marketing/field_definitions #
+
+data = JSON.parse('{
+  "name": "pet",
+  "field_type": "Text"
+}')
+
+response = sg.client.marketing.field_definitions.post(request_body: data)
+puts response.status_code
+puts response.body
+puts response.headers
+
+##################################################
+# Get All Field Definitions #
+# GET /marketing/field_definitions #
+
+response = sg.client.marketing.field_definitions.get
+puts response.status_code
+puts response.body
+puts response.headers
+
+##################################################
+# Update Custom Field Definition #
+# PATCH /marketing/field_definitions/{custom_field_id} #
+
+data = JSON.parse('{
+  "name": "new_custom_field_name"
+}')
+custom_field_id = 'e1_T'
+response = sg.client.marketing.field_definitions._(custom_field_id).patch(request_body: data)
+puts response.status_code
+puts response.body
+puts response.headers
+
+##################################################
+# Delete Custom Field Definition #
+# DELETE /marketing/field_definitions/{custom_field_id} #
+
+custom_field_id = 'e1_T'
+response = sg.client.marketing.field_definitions._(custom_field_id).delete
+puts response.status_code
+puts response.body
+puts response.headers
diff --git a/examples/new_marketing_campaigns/lists.rb b/examples/new_marketing_campaigns/lists.rb
new file mode 100644
index 00000000..ec50c06e
--- /dev/null
+++ b/examples/new_marketing_campaigns/lists.rb
@@ -0,0 +1,35 @@
+require 'sendgrid-ruby'
+
+sg = SendGrid::API.new(api_key: ENV['SENDGRID_API_KEY'])
+
+##################################################
+# Create List #
+# GET /marketing/lists #
+
+data = JSON.parse('{
+  "name": "list-name"
+}')
+
+response = sg.client.marketing.lists.post(request_body: data)
+puts response.status_code
+puts response.body
+puts response.headers
+
+##################################################
+# Get All Lists #
+# GET /marketing/lists #
+
+response = sg.client.marketing.lists.get
+puts response.status_code
+puts response.body
+puts response.headers
+
+##################################################
+# Get a List by ID #
+# GET /marketing/lists/{id} #
+
+list_id = 'ca7a3796-e8a8-4029-9ccb-df8937940562'
+response = sg.client.marketing.lists._(list_id).get
+puts response.status_code
+puts response.body
+puts response.headers
diff --git a/examples/new_marketing_campaigns/singlesends.rb b/examples/new_marketing_campaigns/singlesends.rb
new file mode 100644
index 00000000..796e5233
--- /dev/null
+++ b/examples/new_marketing_campaigns/singlesends.rb
@@ -0,0 +1,28 @@
+require 'sendgrid-ruby'
+
+sg = SendGrid::API.new(api_key: ENV['SENDGRID_API_KEY'])
+
+##################################################
+# Create Single Send #
+# POST /marketing/singlesends #
+
+data = JSON.parse('{
+  "name": "Example API Created Single Send",
+  "categories": [
+    "unique opens"
+  ],
+  "send_to": {
+    "all": true
+  },
+  "email_config": {
+    "design_id": "<your-design-id>",
+    "editor": "design",
+    "suppression_group_id": 12,
+    "sender_id": 10
+  }
+}')
+
+response = sg.client.marketing.singlesends.post(request_body: data)
+puts response.status_code
+puts response.body
+puts response.headers
diff --git a/lib/sendgrid/version.rb b/lib/sendgrid/version.rb
index 7947e20a..ab225ad9 100644
--- a/lib/sendgrid/version.rb
+++ b/lib/sendgrid/version.rb
@@ -1,3 +1,3 @@
 module SendGrid
-  VERSION = '6.6.0'.freeze
+  VERSION = '6.6.1'.freeze
 end
diff --git a/sendgrid-ruby.gemspec b/sendgrid-ruby.gemspec
index 279d0c39..3856eb3b 100644
--- a/sendgrid-ruby.gemspec
+++ b/sendgrid-ruby.gemspec
@@ -25,7 +25,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rack'
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'rspec'
-  spec.add_development_dependency 'rubocop'
   spec.add_development_dependency 'simplecov', '~> 0.18.5'
   spec.add_development_dependency 'sinatra', '>= 1.4.7', '< 3'
 end
diff --git a/test/sendgrid/test_sendgrid-ruby.rb b/test/sendgrid/test_sendgrid-ruby.rb
index 2a1c7451..0435c680 100644
--- a/test/sendgrid/test_sendgrid-ruby.rb
+++ b/test/sendgrid/test_sendgrid-ruby.rb
@@ -33,7 +33,7 @@ def test_init
     assert_equal(test_headers, sg.request_headers)
     assert_equal('v3', sg.version)
     assert_equal(subuser, sg.impersonate_subuser)
-    assert_equal('6.6.0', SendGrid::VERSION)
+    assert_equal('6.6.1', SendGrid::VERSION)
     assert_instance_of(SendGrid::Client, sg.client)
     assert_equal({}, sg.http_options)
   end
@@ -2683,12 +2683,8 @@ def test_gitignore_exists
     assert(File.file?('./.gitignore'))
   end
 
-  def test_travis_exists
-    assert(File.file?('./.travis.yml'))
-  end
-
-  def test_codeclimate_exists
-    assert(File.file?('./.codeclimate.yml'))
+  def test_gh_actions_exists
+    assert(File.file?('./.github/workflows/test-and-deploy.yml'))
   end
 
   def test_changelog_exists