diff --git a/.travis.yml b/.travis.yml
index 8bf1951..be72d86 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,14 @@
 language: ruby
-sudo: false
 env:
-  - 'RAILS_VERSION=5.1.2'
+  matrix:
+    - "RAILS_VERSION=5.2"
+    - "RAILS_VERSION=6.0"
 rvm:
-  - 2.3.3
-matrix:
-before_install: gem install bundler -v 1.13.6
+  - 2.4
+  - 2.5
+  - 2.6
+  - 2.7
 script: bundle exec rspec spec
 
+before_install:
+  - gem install bundler
diff --git a/README.md b/README.md
index bc2a712..47494be 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@ end
 Support:
 
 * Ruby 1.9+ with Rails 4
-* Ruby 2.3+ with Rails 5
+* Ruby 2.4+ with Rails 5
 
 For Rails 4 add this to your application's Gemfile:
 
@@ -62,10 +62,10 @@ For Rails 4 add this to your application's Gemfile:
 gem 'jsonapi-utils', '~> 0.4.9'
 ```
 
-For Rails 5:
+For Rails 5+:
 
 ```ruby
-gem 'jsonapi-utils', '~> 0.7.2'
+gem 'jsonapi-utils', '~> 0.7.3'
 ```
 
 And then execute:
@@ -225,12 +225,12 @@ class CustomPaginator < JSONAPI::Paginator
   end
 ```
 
-And then it can be either set at the resource class level (e.g. UserResource.paginator :custom_paginator) or via config initializer:
+And then it can be either set at the resource class level (e.g. UserResource.paginator :custom) or via config initializer:
 
 ```ruby
 # config/initializers/jsonapi_resources.rb
 JSONAPI.configure do |config|
-  config.default_paginator = :custom_paginator
+  config.default_paginator = :custom
 end
 ```
 
diff --git a/jsonapi-utils.gemspec b/jsonapi-utils.gemspec
index a89bc18..a26093d 100644
--- a/jsonapi-utils.gemspec
+++ b/jsonapi-utils.gemspec
@@ -19,15 +19,15 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_runtime_dependency 'jsonapi-resources', '0.9.8'
+  spec.add_runtime_dependency 'jsonapi-resources', '0.9.11'
 
-  spec.add_development_dependency 'bundler', '~> 1.10'
-  spec.add_development_dependency 'rake', '~> 10.0'
-  spec.add_development_dependency 'rails', ENV['RAILS_VERSION'] || '~> 5.1'
-  spec.add_development_dependency 'sqlite3', '~> 1.3.6'
-  spec.add_development_dependency 'rspec-rails', '~> 3.1'
-  spec.add_development_dependency 'factory_girl', '~> 4.8'
+  spec.add_development_dependency 'bundler', '~> 1.14', '>= 1.14'
+  spec.add_development_dependency 'rake', '~> 12.3', '>= 12.3.3'
+  spec.add_development_dependency 'rails', (ENV['RAILS_VERSION'] || '~> 5.2'), '>= 5.2.4'
+  spec.add_development_dependency 'sqlite3', '~> 1.4'
+  spec.add_development_dependency 'rspec-rails', '~> 3.9', '>= 3.9.0'
+  spec.add_development_dependency 'factory_bot', '~> 5.1'
   spec.add_development_dependency 'smart_rspec', '~> 0.1.6'
-  spec.add_development_dependency 'pry', '~> 0.10.3'
-  spec.add_development_dependency 'pry-byebug'
+  spec.add_development_dependency 'pry', '~> 0.12', '>= 0.12.2'
+  spec.add_development_dependency 'pry-byebug', '~> 3.7', '>= 3.7.0'
 end
diff --git a/lib/jsonapi/utils/response/formatters.rb b/lib/jsonapi/utils/response/formatters.rb
index 055b026..c821c36 100644
--- a/lib/jsonapi/utils/response/formatters.rb
+++ b/lib/jsonapi/utils/response/formatters.rb
@@ -15,7 +15,7 @@ module Formatters
         # @option options [JSONAPI::Resource] resource: it tells the formatter which resource
         #   class to be used rather than use an infered one (default behaviour)
         #
-        # @option options [JSONAPI::Resource] source_resource: it tells the formatter that this response is from a related resource
+        # @option options [JSONAPI::Resource] source: it tells the formatter that this response is from a related resource
         #   and the result should be interpreted as a related resources response
         #
         # @option options [String, Symbol] relationship_type: it tells that the formatter which relationship the data is from
@@ -32,7 +32,7 @@ module Formatters
         # @api public
         def jsonapi_format(object, options = {})
           if object.is_a?(Hash)
-            hash    = object.with_indifferent_access
+            hash = object.with_indifferent_access
             object = hash_to_active_record(hash[:data], options[:model])
           end
           fix_custom_request_options(object)
@@ -120,8 +120,8 @@ def build_response_document(object, options)
         # @option options [JSONAPI::Resource] :resource which resource class to be used
         #   rather than using the default one (inferred)
         #
-        # @option options [ActiveRecord::Base, JSONAPI::Resource] :source source of related resource,
-        #   the result should be interpreted as a related resources response
+        # @option options [ActiveRecord::Base, JSONAPI::Resource] :source parent model/resource
+        #   of the related resource
         #
         # @option options [String, Symbol] :relationship which relationship the data is from
         #
@@ -133,13 +133,15 @@ def build_response_document(object, options)
         #
         # @api private
         def build_collection_result(object, options)
-          records        = build_collection(object, options)
+          records = build_collection(object, options)
           result_options = result_options(object, options)
 
-          if options[:source].present? && related_resource_operation?
-            source_resource   = turn_source_into_resource(options[:source])
+          if related_resource_operation?(options)
+            source_resource = turn_source_into_resource(options[:source])
             relationship_type = get_source_relationship(options)
-            JSONAPI::RelatedResourcesOperationResult.new(:ok,
+
+            JSONAPI::RelatedResourcesOperationResult.new(
+              :ok,
               source_resource,
               relationship_type,
               records,
@@ -152,11 +154,24 @@ def build_collection_result(object, options)
 
         # Is this a request for related resources?
         #
+        # In order to answer that it needs to check for some {options}
+        # controller params like {params[:source]} and {params[:relationship]}.
+        #
+        # @option options [Boolean] :related when true, jsonapi-utils infers the parent and
+        #   related resources from controller's {params} values.
+        #
+        # @option options [ActiveRecord::Base, JSONAPI::Resource] :source parent model/resource
+        #   of the related resource
+        #
+        # @option options [String, Symbol] :relationship which relationship the data is from
+        #
         # @return [Boolean]
         #
         # @api private
-        def related_resource_operation?
-          params[:source].present? && params[:relationship].present?
+        def related_resource_operation?(options)
+          (options[:related] || options[:source].present?) &&
+            params[:source].present? &&
+            params[:relationship].present?
         end
 
         # Apply a proper action setup for custom requests/actions.
@@ -263,8 +278,9 @@ def get_source_relationship(options)
         # @api private
         def result_options(records, options)
           {}.tap do |data|
-            if JSONAPI.configuration.default_paginator != :none &&
-              JSONAPI.configuration.top_level_links_include_pagination
+            data[:meta] = options.fetch(:meta, {})
+
+            if include_pagination_links?
               data[:pagination_params] = pagination_params(records, options)
             end
 
@@ -272,7 +288,7 @@ def result_options(records, options)
               data[:record_count] = record_count_for(records, options)
             end
 
-            if JSONAPI.configuration.top_level_meta_include_page_count
+            if include_page_count?
               data[:page_count] = page_count_for(data[:record_count])
             end
           end
diff --git a/lib/jsonapi/utils/support/pagination.rb b/lib/jsonapi/utils/support/pagination.rb
index c8f1eaf..5687fe1 100644
--- a/lib/jsonapi/utils/support/pagination.rb
+++ b/lib/jsonapi/utils/support/pagination.rb
@@ -4,20 +4,40 @@ module Support
       module Pagination
         RecordCountError = Class.new(ArgumentError)
 
+        # Check whether pagination links should be included.
+        #
+        # @api public
+        # @return [Boolean]
+        def include_pagination_links?
+          JSONAPI.configuration.default_paginator != :none &&
+            JSONAPI.configuration.top_level_links_include_pagination
+        end
+
+        # Check whether pagination's page count should be included
+        # on the "meta" key.
+        #
+        # @api public
+        # @return [Boolean]
+        def include_page_count?
+          JSONAPI.configuration.top_level_meta_include_page_count
+        end
+
         # Apply proper pagination to the records.
         #
         # @param records [ActiveRecord::Relation, Array] collection of records
         #   e.g.: User.all or [{ id: 1, name: 'Tiago' }, { id: 2, name: 'Doug' }]
         #
-        # @param options [Hash] JU's options
+        # @param options [Hash] JSONAPI::Utils' options
         #   e.g.: { resource: V2::UserResource, count: 100 }
         #
         # @return [ActiveRecord::Relation, Array]
         #
         # @api public
         def apply_pagination(records, options = {})
-          return records unless apply_pagination?(options)
-          records.is_a?(Array) ? records[paginate_with(:range)] : paginate_with(:paginator).apply(records, nil)
+          if !apply_pagination?(options) then records
+          elsif records.is_a?(Array)     then records[paginate_with(:range)]
+          else paginate_with(:paginator).apply(records, nil)
+          end
         end
 
         # Mount pagination params for JSONAPI::ResourcesOperationResult.
@@ -32,9 +52,10 @@ def apply_pagination(records, options = {})
         # @return [Hash]
         #   e.g.: {"first"=>{"number"=>1, "size"=>2}, "next"=>{"number"=>2, "size"=>2}, "last"=>{"number"=>2, "size"=>2}}
         #
+        #
         # @api public
         def pagination_params(records, options)
-          return {} unless JSONAPI.configuration.top_level_links_include_pagination
+          return {} unless include_pagination_links?
           paginator.links_page_params(record_count: record_count_for(records, options))
         end
 
diff --git a/lib/jsonapi/utils/version.rb b/lib/jsonapi/utils/version.rb
index c8c1c81..1bddf34 100644
--- a/lib/jsonapi/utils/version.rb
+++ b/lib/jsonapi/utils/version.rb
@@ -1,5 +1,5 @@
 module JSONAPI
   module Utils
-    VERSION = '0.7.2'.freeze
+    VERSION = '0.7.3'.freeze
   end
 end
diff --git a/spec/controllers/posts_controller_spec.rb b/spec/controllers/posts_controller_spec.rb
index b709d08..45b74f6 100644
--- a/spec/controllers/posts_controller_spec.rb
+++ b/spec/controllers/posts_controller_spec.rb
@@ -4,7 +4,7 @@
   include_context 'JSON API headers'
 
   before(:all) do
-    @post = FactoryGirl.create_list(:post, 3).first
+    @post = FactoryBot.create_list(:post, 3).first
   end
 
   before(:each) do
diff --git a/spec/controllers/users_controller_spec.rb b/spec/controllers/users_controller_spec.rb
index 56786ef..8556f94 100644
--- a/spec/controllers/users_controller_spec.rb
+++ b/spec/controllers/users_controller_spec.rb
@@ -4,7 +4,7 @@
   include_context 'JSON API headers'
 
   before(:all) do
-    @user = FactoryGirl.create_list(:user, 3, :with_posts).first
+    @user = FactoryBot.create_list(:user, 3, :with_posts).first
   end
 
   before(:each) do
@@ -28,7 +28,7 @@
       expect(response).to have_http_status :ok
       expect(response).to have_primary_data('users')
       expect(response).to have_data_attributes(fields)
-      expect(response).to have_relationships(relationships)
+      expect(response).to have_relationships(relationships - ['profile'])
     end
 
     context 'with "include"' do
diff --git a/spec/features/page_count_spec.rb b/spec/features/page_count_spec.rb
index a85d761..9c3ec64 100644
--- a/spec/features/page_count_spec.rb
+++ b/spec/features/page_count_spec.rb
@@ -29,13 +29,12 @@ def TestApp.draw_page_count_test_routes
 # Feature Tests
 ##
 
-
 describe PageCountTestController, type: :controller do
   include_context 'JSON API headers'
 
   before(:all) do
     TestApp.draw_page_count_test_routes
-    FactoryGirl.create_list(:user, 3, :with_posts)
+    FactoryBot.create_list(:user, 3, :with_posts)
   end
 
   describe 'page count with a paged paginator' do
diff --git a/spec/features/record_count_spec.rb b/spec/features/record_count_spec.rb
index b90a982..b8113bc 100644
--- a/spec/features/record_count_spec.rb
+++ b/spec/features/record_count_spec.rb
@@ -56,7 +56,7 @@ def TestApp.draw_record_count_test_routes
 
   before(:all) do
     TestApp.draw_record_count_test_routes
-    FactoryGirl.create_list(:user, 3, :with_posts)
+    FactoryBot.create_list(:user, 3, :with_posts)
   end
 
   describe 'explicit count' do
diff --git a/spec/jsonapi/utils/support/pagination_spec.rb b/spec/jsonapi/utils/support/pagination_spec.rb
index c1b2632..f032295 100644
--- a/spec/jsonapi/utils/support/pagination_spec.rb
+++ b/spec/jsonapi/utils/support/pagination_spec.rb
@@ -6,7 +6,7 @@
   end
 
   before(:all) do
-    FactoryGirl.create_list(:user, 2)
+    FactoryBot.create_list(:user, 2)
   end
 
   let(:options) { {} }
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index d6c565f..17ef5b0 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,10 +1,10 @@
 require 'smart_rspec'
-require 'factory_girl'
+require 'factory_bot'
 require 'support/helpers'
 
 RSpec.configure do |config|
-  config.include FactoryGirl::Syntax::Methods
   config.include Helpers::ResponseParser
+  config.include FactoryBot::Syntax::Methods
 
   config.define_derived_metadata do |meta|
     meta[:aggregate_failures] = true
diff --git a/spec/support/controllers.rb b/spec/support/controllers.rb
index d937320..96c57b7 100644
--- a/spec/support/controllers.rb
+++ b/spec/support/controllers.rb
@@ -14,7 +14,7 @@ def index
     jsonapi_render json: @user.posts, options: { count: 100 }
   end
 
-  # GET /users/:user_id//index_with_hash
+  # GET /users/:user_id/index_with_hash
   def index_with_hash
     @posts = { data: [
       { id: 1, title: 'Lorem Ipsum', body: 'Body 4' },
diff --git a/spec/support/factories.rb b/spec/support/factories.rb
index d99b29e..57da6b6 100644
--- a/spec/support/factories.rb
+++ b/spec/support/factories.rb
@@ -1,21 +1,9 @@
-require 'factory_girl'
+require 'factory_bot'
+require_relative './models'
 
-FactoryGirl.define do
-  factory :category, class: Category do
-    sequence(:title) { |n| "Title for Category #{n}" }
-  end
-
-  factory :post, class: Post do
-    association :author, factory: :user
-    category
-
-    sequence(:id) { |n| n }
-    sequence(:title) { |n| "Title for Post #{n}" }
-    sequence(:body) { |n| "Body for Post #{n}" }
-    content_type :article
-    hidden_field 'It\'s a hidden field!'
-  end
+# require 'byebug'; byebug
 
+FactoryBot.define do
   factory :user, class: User do
     sequence(:id) { |n| n }
     sequence(:first_name) { |n| "User##{n}" }
@@ -24,7 +12,7 @@
     after(:create) { |user| create(:profile, user: user) }
 
     trait :with_posts do
-      transient { post_count 3 }
+      transient { post_count { 3 } }
       after(:create) do |user, e|
         create_list(:post, e.post_count, author: user)
       end
@@ -37,4 +25,19 @@
     sequence(:nickname) { |n| "Nickname##{n}" }
     sequence(:location) { |n| "Location##{n}" }
   end
+
+  factory :post, class: Post do
+    association :author, factory: :user
+    category
+
+    sequence(:id) { |n| n }
+    sequence(:title) { |n| "Title for Post #{n}" }
+    sequence(:body) { |n| "Body for Post #{n}" }
+    content_type { :article }
+    hidden_field { 'It\'s a hidden field!' }
+  end
+
+  factory :category, class: Category do
+    sequence(:title) { |n| "Title for Category #{n}" }
+  end
 end