diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 099260abd8..e05fb5acf9 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -259,7 +259,7 @@ functions:
   "upload test results":
     - command: attach.xunit_results
       params:
-        file: ./src/tmp/rspec.xml
+        file: ./src/rspec.xml
 
   "run tests":
     - command: shell.exec
@@ -308,7 +308,7 @@ post:
   # Removed, causing timeouts
   # - func: "upload working dir"
   - func: "upload mo artifacts"
-  #- func: "upload test results"
+  # - func: "upload test results"
   - func: "upload test results to s3"
 
 task_groups:
@@ -596,6 +596,10 @@ axes:
         display_name: "Rails 7.2"
         variables:
           RAILS: "7.2"
+      - id: "8.0"
+        display_name: "Rails 8.0"
+        variables:
+          RAILS: "8.0"
 
   - id: "test-i18n-fallbacks"
     display_name: Test i18n fallbacks
@@ -735,19 +739,6 @@ buildvariants:
   tasks:
      - name: "test"
 
-- matrix_name: "rails-7"
-  matrix_spec:
-    ruby: ["ruby-3.3"]
-    driver: ["current"]
-    mongodb-version: "6.0"
-    topology: "standalone"
-    rails: ['7.0', '7.1', '7.2']
-    os: ubuntu-22.04
-    fle: helper
-  display_name: "${rails}, ${driver}, ${mongodb-version} (FLE ${fle})"
-  tasks:
-    - name: "test"
-
 - matrix_name: "bson-min"
   matrix_spec:
     driver: [bson-min]
@@ -770,6 +761,44 @@ buildvariants:
   tasks:
     - name: "test"
 
+- matrix_name: "rails-master"
+  matrix_spec:
+    ruby: ["ruby-3.2"]
+    driver: ["current"]
+    mongodb-version: "7.0"
+    topology: "standalone"
+    rails: ['master']
+    os: ubuntu-22.04
+    fle: helper
+  display_name: "${rails}, ${driver}, ${mongodb-version} (FLE ${fle})"
+  tasks:
+    - name: "test"
+
+- matrix_name: "rails-8"
+  matrix_spec:
+    ruby: ["ruby-3.3"]
+    driver: ["current"]
+    mongodb-version: "7.0"
+    topology: "standalone"
+    rails: ['8.0']
+    os: ubuntu-22.04
+    fle: helper
+  display_name: "${rails}, ${driver}, ${mongodb-version} (FLE ${fle})"
+  tasks:
+    - name: "test"
+
+- matrix_name: "rails-7"
+  matrix_spec:
+    ruby: ["ruby-3.3"]
+    driver: ["current"]
+    mongodb-version: "6.0"
+    topology: "standalone"
+    rails: ['7.0', '7.1', '7.2']
+    os: ubuntu-22.04
+    fle: helper
+  display_name: "${rails}, ${driver}, ${mongodb-version} (FLE ${fle})"
+  tasks:
+    - name: "test"
 
 - matrix_name: "rails-6"
   matrix_spec:
@@ -795,27 +824,40 @@ buildvariants:
   tasks:
      - name: "test"
 
+- matrix_name: app-tests-rails-8
+  matrix_spec:
+    ruby: ["ruby-3.2", "ruby-3.3"]
+    driver: ["current"]
+    mongodb-version: '7.0'
+    topology: standalone
+    app-tests: yes
+    rails: ['8.0']
+    os: ubuntu-22.04
+  display_name: "app tests ${driver}, ${ruby}, ${rails}"
+  tasks:
+    - name: "test"
+
 - matrix_name: app-tests-rails-7
   matrix_spec:
-    ruby: ["ruby-3.1", "ruby-3.2", "ruby-3.3"]
+    ruby: ["ruby-3.2", "ruby-3.3"]
     driver: ["current"]
     mongodb-version: '7.0'
     topology: standalone
     app-tests: yes
-    rails: ['6.1', '7.0', '7.1', '7.2']
+    rails: ['7.0', '7.1', '7.2']
     os: ubuntu-22.04
   display_name: "app tests ${driver}, ${ruby}, ${rails}"
   tasks:
     - name: "test"
 
-- matrix_name: app-tests-rails-6-0
+- matrix_name: app-tests-rails-6
   matrix_spec:
-    ruby: ["ruby-3.0"]
+    ruby: ["ruby-2.7"]
     driver: ["current"]
     mongodb-version: '5.0'
     topology: standalone
     app-tests: yes
-    rails: ['6.0']
+    rails: ['6.0', '6.1']
     os: ubuntu-20.04
   display_name: "app tests ${driver}, ${ruby}, ${rails}"
   tasks:
diff --git a/.evergreen/config/axes.yml.erb b/.evergreen/config/axes.yml.erb
index aca37995b5..708b312362 100644
--- a/.evergreen/config/axes.yml.erb
+++ b/.evergreen/config/axes.yml.erb
@@ -223,6 +223,10 @@ axes:
         display_name: "Rails 7.2"
         variables:
           RAILS: "7.2"
+      - id: "8.0"
+        display_name: "Rails 8.0"
+        variables:
+          RAILS: "8.0"
 
   - id: "test-i18n-fallbacks"
     display_name: Test i18n fallbacks
diff --git a/.evergreen/config/commands.yml.erb b/.evergreen/config/commands.yml.erb
index 1410abdd8f..e9e45448b7 100644
--- a/.evergreen/config/commands.yml.erb
+++ b/.evergreen/config/commands.yml.erb
@@ -233,7 +233,7 @@ functions:
   "upload test results":
     - command: attach.xunit_results
       params:
-        file: ./src/tmp/rspec.xml
+        file: ./src/rspec.xml
 
   "run tests":
     - command: shell.exec
@@ -282,7 +282,7 @@ post:
   # Removed, causing timeouts
   # - func: "upload working dir"
   - func: "upload mo artifacts"
-  #- func: "upload test results"
+  # - func: "upload test results"
   - func: "upload test results to s3"
 
 task_groups:
diff --git a/.evergreen/config/variants.yml.erb b/.evergreen/config/variants.yml.erb
index a6848736c1..5d72b4a631 100644
--- a/.evergreen/config/variants.yml.erb
+++ b/.evergreen/config/variants.yml.erb
@@ -109,19 +109,6 @@ buildvariants:
   tasks:
      - name: "test"
 
-- matrix_name: "rails-7"
-  matrix_spec:
-    ruby: ["ruby-3.3"]
-    driver: ["current"]
-    mongodb-version: "6.0"
-    topology: "standalone"
-    rails: ['7.0', '7.1', '7.2']
-    os: ubuntu-22.04
-    fle: helper
-  display_name: "${rails}, ${driver}, ${mongodb-version} (FLE ${fle})"
-  tasks:
-    - name: "test"
-
 - matrix_name: "bson-min"
   matrix_spec:
     driver: [bson-min]
@@ -144,6 +131,44 @@ buildvariants:
   tasks:
     - name: "test"
 
+- matrix_name: "rails-master"
+  matrix_spec:
+    ruby: ["ruby-3.2"]
+    driver: ["current"]
+    mongodb-version: "7.0"
+    topology: "standalone"
+    rails: ['master']
+    os: ubuntu-22.04
+    fle: helper
+  display_name: "${rails}, ${driver}, ${mongodb-version} (FLE ${fle})"
+  tasks:
+    - name: "test"
+
+- matrix_name: "rails-8"
+  matrix_spec:
+    ruby: ["ruby-3.3"]
+    driver: ["current"]
+    mongodb-version: "7.0"
+    topology: "standalone"
+    rails: ['8.0']
+    os: ubuntu-22.04
+    fle: helper
+  display_name: "${rails}, ${driver}, ${mongodb-version} (FLE ${fle})"
+  tasks:
+    - name: "test"
+
+- matrix_name: "rails-7"
+  matrix_spec:
+    ruby: ["ruby-3.3"]
+    driver: ["current"]
+    mongodb-version: "6.0"
+    topology: "standalone"
+    rails: ['7.0', '7.1', '7.2']
+    os: ubuntu-22.04
+    fle: helper
+  display_name: "${rails}, ${driver}, ${mongodb-version} (FLE ${fle})"
+  tasks:
+    - name: "test"
 
 - matrix_name: "rails-6"
   matrix_spec:
@@ -169,27 +194,40 @@ buildvariants:
   tasks:
      - name: "test"
 
+- matrix_name: app-tests-rails-8
+  matrix_spec:
+    ruby: ["ruby-3.2", "ruby-3.3"]
+    driver: ["current"]
+    mongodb-version: '7.0'
+    topology: standalone
+    app-tests: yes
+    rails: ['8.0']
+    os: ubuntu-22.04
+  display_name: "app tests ${driver}, ${ruby}, ${rails}"
+  tasks:
+    - name: "test"
+
 - matrix_name: app-tests-rails-7
   matrix_spec:
-    ruby: ["ruby-3.1", "ruby-3.2", "ruby-3.3"]
+    ruby: ["ruby-3.2", "ruby-3.3"]
     driver: ["current"]
     mongodb-version: '7.0'
     topology: standalone
     app-tests: yes
-    rails: ['6.1', '7.0', '7.1', '7.2']
+    rails: ['7.0', '7.1', '7.2']
     os: ubuntu-22.04
   display_name: "app tests ${driver}, ${ruby}, ${rails}"
   tasks:
     - name: "test"
 
-- matrix_name: app-tests-rails-6-0
+- matrix_name: app-tests-rails-6
   matrix_spec:
-    ruby: ["ruby-3.0"]
+    ruby: ["ruby-2.7"]
     driver: ["current"]
     mongodb-version: '5.0'
     topology: standalone
     app-tests: yes
-    rails: ['6.0']
+    rails: ['6.0', '6.1']
     os: ubuntu-20.04
   display_name: "app tests ${driver}, ${ruby}, ${rails}"
   tasks:
diff --git a/.evergreen/run-tests.sh b/.evergreen/run-tests.sh
index b48d881f40..ce5db1a1cb 100755
--- a/.evergreen/run-tests.sh
+++ b/.evergreen/run-tests.sh
@@ -118,6 +118,6 @@ if test -f tmp/rspec-all.json; then
   mv tmp/rspec-all.json tmp/rspec.json
 fi
 
-python3 -m mtools.mlaunch.mlaunch stop --dir "$dbdir"
+python3 -m mtools.mlaunch.mlaunch stop --dir "$dbdir" || true
 
 exit ${test_status}
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 401792de6d..73b62b7f3b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -50,28 +50,38 @@ jobs:
           driver: stable
           gemfile: gemfiles/driver_stable.gemfile
           experimental: false
-        - mongodb: '6.0'
-          ruby: ruby-3.1
+        - mongodb: '7.0'
+          ruby: ruby-3.3
+          topology: server
+          os: ubuntu-22.04
+          task: test
+          driver: current
+          rails: '8.0'
+          fle: helper
+          gemfile: gemfiles/rails-8.0.gemfile
+          experimental: false
+        - mongodb: '7.0'
+          ruby: ruby-3.2
           topology: server
           os: ubuntu-20.04
           task: test
           driver: current
-          rails: '7.0'
+          rails: '7.2'
           fle: helper
-          gemfile: gemfiles/rails-7.0.gemfile
+          gemfile: gemfiles/rails-7.2.gemfile
           experimental: false
-        - mongodb: '6.0'
-          ruby: ruby-3.1
+        - mongodb: '7.0'
+          ruby: ruby-3.2
           topology: server
           os: ubuntu-20.04
           task: test
           driver: current
-          rails: '6.1'
+          rails: '7.1'
           fle: helper
-          gemfile: gemfiles/rails-6.1.gemfile
+          gemfile: gemfiles/rails-7.1.gemfile
           experimental: false
-        - mongodb: '6.0'
-          ruby: ruby-3.0
+        - mongodb: '7.0'
+          ruby: ruby-3.1
           topology: server
           os: ubuntu-20.04
           task: test
@@ -80,6 +90,16 @@ jobs:
           fle: helper
           gemfile: gemfiles/rails-7.0.gemfile
           experimental: false
+        - mongodb: '6.0'
+          ruby: ruby-3.1
+          topology: server
+          os: ubuntu-20.04
+          task: test
+          driver: current
+          rails: '6.1'
+          fle: helper
+          gemfile: gemfiles/rails-6.1.gemfile
+          experimental: false
         - mongodb: '6.0'
           ruby: ruby-3.0
           topology: server
@@ -126,22 +146,6 @@ jobs:
           driver: current
           gemfile: Gemfile
           experimental: false
-        - mongodb: '4.0'
-          ruby: ruby-2.7
-          topology: replica_set
-          os: ubuntu-20.04
-          task: test
-          driver: current
-          gemfile: Gemfile
-          experimental: false
-        - mongodb: '3.6'
-          ruby: ruby-2.7
-          topology: replica_set
-          os: ubuntu-20.04
-          task: test
-          driver: current
-          gemfile: Gemfile
-          experimental: false
 
     steps:
     - name: repo checkout
diff --git a/.gitignore b/.gitignore
index 1eed0ec2d8..fed26118c1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,3 +31,4 @@ examples
 .env
 .env.private*
 build
+rspec.xml
diff --git a/gemfiles/rails-6.0.gemfile b/gemfiles/rails-6.0.gemfile
index c8962320a3..35923a605f 100644
--- a/gemfiles/rails-6.0.gemfile
+++ b/gemfiles/rails-6.0.gemfile
@@ -4,6 +4,10 @@ source 'https://rubygems.org'
 gem 'actionpack', '~> 6.0'
 gem 'activemodel', '~> 6.0'
 
+group :test do
+  gem 'activejob', '~> 6.0'
+end
+
 gemspec path: '..'
 
 require_relative './standard'
diff --git a/gemfiles/rails-6.1.gemfile b/gemfiles/rails-6.1.gemfile
index 06a654ecd8..8e5a896766 100644
--- a/gemfiles/rails-6.1.gemfile
+++ b/gemfiles/rails-6.1.gemfile
@@ -4,6 +4,9 @@ source 'https://rubygems.org'
 gem 'actionpack', '~> 6.1'
 gem 'activemodel', '~> 6.1'
 
+group :test do
+  gem 'activejob', '~> 6.1'
+end
 gemspec path: '..'
 
 require_relative './standard'
diff --git a/gemfiles/rails-7.0.gemfile b/gemfiles/rails-7.0.gemfile
index c5bf14c395..5afbe8c57a 100644
--- a/gemfiles/rails-7.0.gemfile
+++ b/gemfiles/rails-7.0.gemfile
@@ -4,6 +4,9 @@ source 'https://rubygems.org'
 gem 'actionpack', '~> 7.0'
 gem 'activemodel', '~> 7.0'
 
+group :test do
+  gem 'activejob', '~> 7.0'
+end
 gemspec path: '..'
 
 require_relative './standard'
diff --git a/gemfiles/rails-7.1.gemfile b/gemfiles/rails-7.1.gemfile
index 3b6debf9ec..3019a83ef3 100644
--- a/gemfiles/rails-7.1.gemfile
+++ b/gemfiles/rails-7.1.gemfile
@@ -4,6 +4,9 @@ source 'https://rubygems.org'
 gem 'actionpack', '~> 7.1'
 gem 'activemodel', '~> 7.1'
 
+group :test do
+  gem 'activejob', '~> 7.1'
+end
 gemspec path: '..'
 
 require_relative './standard'
diff --git a/gemfiles/rails-7.2.gemfile b/gemfiles/rails-7.2.gemfile
index bdc1062ec6..8319573653 100644
--- a/gemfiles/rails-7.2.gemfile
+++ b/gemfiles/rails-7.2.gemfile
@@ -4,6 +4,9 @@ source 'https://rubygems.org'
 gem 'actionpack', '~> 7.2'
 gem 'activemodel', '~> 7.2'
 
+group :test do
+  gem 'activejob', '~> 7.2'
+end
 gemspec path: '..'
 
 require_relative './standard'
diff --git a/gemfiles/rails-8.0.gemfile b/gemfiles/rails-8.0.gemfile
new file mode 100644
index 0000000000..8ae63613bc
--- /dev/null
+++ b/gemfiles/rails-8.0.gemfile
@@ -0,0 +1,14 @@
+# rubocop:todo all
+source 'https://rubygems.org'
+
+gem 'actionpack', '8.0.0.rc2'
+gem 'activemodel', '8.0.0.rc2'
+
+group :test do
+  gem 'activejob', '8.0.0.rc2'
+end
+gemspec path: '..'
+
+require_relative './standard'
+
+standard_dependencies
diff --git a/gemfiles/rails-master.gemfile b/gemfiles/rails-master.gemfile
index 3dc51cbd13..e3a93d9c04 100644
--- a/gemfiles/rails-master.gemfile
+++ b/gemfiles/rails-master.gemfile
@@ -4,6 +4,10 @@ source 'https://rubygems.org'
 gem 'actionpack', git: 'https://github.com/rails/rails'
 gem 'activemodel', git: 'https://github.com/rails/rails'
 
+group :test do
+  gem 'activejob', git: 'https://github.com/rails/rails'
+end
+
 gemspec path: '..'
 
 require_relative './standard'
diff --git a/gemfiles/standard.rb b/gemfiles/standard.rb
index e89e2ae899..0285630e2e 100644
--- a/gemfiles/standard.rb
+++ b/gemfiles/standard.rb
@@ -36,7 +36,6 @@ def standard_dependencies
   end
 
   group :test do
-    gem 'activejob'
     gem 'timecop'
     gem 'rspec-retry'
     gem 'benchmark-ips'
diff --git a/lib/mongoid/serializable.rb b/lib/mongoid/serializable.rb
index 1e14ea8e67..d1c115b7ca 100644
--- a/lib/mongoid/serializable.rb
+++ b/lib/mongoid/serializable.rb
@@ -13,13 +13,13 @@ module Serializable
     included do
 
       class << self
-        # Note that this intentionally only delegates :include_root_in_json
-        # and not :include_root_in_json? - delegating the latter produces
-        # wrong behavior.
-        # Also note that this intentionally uses the ActiveSupport delegation
-        # functionality and not the Ruby standard library one.
-        # See https://jira.mongodb.org/browse/MONGOID-4849.
-        delegate :include_root_in_json, to: ::Mongoid
+        def include_root_in_json
+          @include_root_in_json.nil? ? ::Mongoid.include_root_in_json : @include_root_in_json
+        end
+
+        def include_root_in_json=(new_value)
+          @include_root_in_json = new_value
+        end
       end
     end
 
diff --git a/lib/mongoid/traversable.rb b/lib/mongoid/traversable.rb
index e53bfe164c..fbcaeee622 100644
--- a/lib/mongoid/traversable.rb
+++ b/lib/mongoid/traversable.rb
@@ -105,7 +105,11 @@ def discriminator_key=(value)
         if value
           Mongoid::Fields::Validators::Macro.validate_field_name(self, value)
           value = value.to_s
-          super
+          if defined?(::ActiveSupport::ClassAttribute)
+            ::ActiveSupport::ClassAttribute.redefine(self, 'discriminator_key', value)
+          else
+            super
+          end
         else
           # When discriminator key is set to nil, replace the class's definition
           # of the discriminator key reader (provided by class_attribute earlier)
@@ -119,7 +123,7 @@ class << self
         # an existing field.
         # This condition also checks if the class has any descendants, because
         # if it doesn't then it doesn't need a discriminator key.
-        return unless !fields.key?(discriminator_key) && !descendants.empty?
+        return if fields.key?(discriminator_key) || descendants.empty?
 
         default_proc = -> { self.class.discriminator_value }
         field(discriminator_key, default: default_proc, type: String)
diff --git a/mongoid.gemspec b/mongoid.gemspec
index 91eab31938..0c8fb6b4e9 100644
--- a/mongoid.gemspec
+++ b/mongoid.gemspec
@@ -38,7 +38,7 @@ Gem::Specification.new do |s|
   # Ruby 3.0 requires ActiveModel 6.0 or higher.
   # activemodel 7.0.0 cannot be used due to Class#descendants issue
   # See: https://github.com/rails/rails/pull/43951
-  s.add_dependency("activemodel", ['>=5.1', '<7.3', '!= 7.0.0'])
+  s.add_dependency("activemodel", ['>=5.1', '<8.1', '!= 7.0.0'])
   s.add_dependency("mongo", ['>=2.18.0', '<3.0.0'])
   s.add_dependency("concurrent-ruby", ['>= 1.0.5', '< 2.0'])
 
diff --git a/spec/integration/active_job_spec.rb b/spec/integration/active_job_spec.rb
index 462e5cb336..8488c7abae 100644
--- a/spec/integration/active_job_spec.rb
+++ b/spec/integration/active_job_spec.rb
@@ -2,31 +2,35 @@
 # rubocop:todo all
 
 require 'spec_helper'
-require 'active_job'
-require 'mongoid/railties/bson_object_id_serializer'
+begin
+  require 'active_job'
+  require 'mongoid/railties/bson_object_id_serializer'
 
-describe 'ActiveJob Serialization' do
-  skip unless defined?(ActiveJob)
+  describe 'ActiveJob Serialization' do
+    skip unless defined?(ActiveJob)
 
-  class TestBsonObjectIdSerializerJob < ActiveJob::Base
-    def perform(*args)
-      args
+    class TestBsonObjectIdSerializerJob < ActiveJob::Base
+      def perform(*args)
+        args
+      end
     end
-  end
 
-  let(:band) do
-    Band.create!
-  end
+    let(:band) do
+      Band.create!
+    end
 
-  before do
-    ActiveJob::Serializers.add_serializers(
-      [::Mongoid::Railties::ActiveJobSerializers::BsonObjectIdSerializer]
-    )
-  end
+    before do
+      ActiveJob::Serializers.add_serializers(
+        [::Mongoid::Railties::ActiveJobSerializers::BsonObjectIdSerializer]
+      )
+    end
 
-  it 'serializes and deserializes BSON::ObjectId' do
-    expect do
-      TestBsonObjectIdSerializerJob.perform_later(band.id)
-    end.not_to raise_error
+    it 'serializes and deserializes BSON::ObjectId' do
+      expect do
+        TestBsonObjectIdSerializerJob.perform_later(band.id)
+      end.not_to raise_error
+    end
   end
+rescue LoadError
+  RSpec.context.skip 'This test requires active_job'
 end
diff --git a/spec/integration/app_spec.rb b/spec/integration/app_spec.rb
index ca67b44cd7..127763fecf 100644
--- a/spec/integration/app_spec.rb
+++ b/spec/integration/app_spec.rb
@@ -36,6 +36,8 @@ def insert_rails_gem_version(cmd)
   context 'demo application' do
     context 'sinatra' do
       it 'runs' do
+        skip 'https://jira.mongodb.org/browse/MONGOID-5826'
+
         clone_application(
           'https://github.com/mongoid/mongoid-demo',
           subdir: 'sinatra-minimal',
@@ -55,6 +57,8 @@ def insert_rails_gem_version(cmd)
 
     context 'rails-api' do
       it 'runs' do
+        skip 'https://jira.mongodb.org/browse/MONGOID-5826'
+
         clone_application(
           'https://github.com/mongoid/mongoid-demo',
           subdir: 'rails-api',
@@ -172,7 +176,7 @@ def install_rails
     if (rails_version = SpecConfig.instance.rails_version) == 'master'
     else
       check_call(%w(gem list))
-      check_call(%w(gem install rails --no-document -v) + ["~> #{rails_version}.0"])
+      check_call(%w(gem install rails --no-document --force -v) + ["~> #{rails_version}.0"])
     end
   end
 
@@ -319,6 +323,10 @@ def adjust_app_gemfile(rails_version: SpecConfig.instance.rails_version)
   end
 
   def adjust_rails_defaults(rails_version: SpecConfig.instance.rails_version)
+    if !rails_version.match?(/^\d+\.\d+$/)
+      # This must be pre-release version, we trim it
+      rails_version = rails_version.split('.')[0..1].join('.')
+    end
     if File.exist?('config/application.rb')
       lines = IO.readlines('config/application.rb')
       lines.each do |line|
diff --git a/spec/mongoid/railties/bson_object_id_serializer_spec.rb b/spec/mongoid/railties/bson_object_id_serializer_spec.rb
index 694e14232c..d90e0577ef 100644
--- a/spec/mongoid/railties/bson_object_id_serializer_spec.rb
+++ b/spec/mongoid/railties/bson_object_id_serializer_spec.rb
@@ -2,23 +2,29 @@
 # rubocop:todo all
 
 require 'spec_helper'
-require 'active_job'
-require 'mongoid/railties/bson_object_id_serializer'
 
-describe 'Mongoid::Railties::ActiveJobSerializers::BsonObjectIdSerializer' do
+begin
+  require 'active_job'
+  require 'mongoid/railties/bson_object_id_serializer'
 
-  let(:serializer) { Mongoid::Railties::ActiveJobSerializers::BsonObjectIdSerializer.instance }
-  let(:object_id) { BSON::ObjectId.new }
 
-  describe '#serialize' do
-    it 'serializes BSON::ObjectId' do
-      expect(serializer.serialize(object_id)).to be_a(String)
+  describe 'Mongoid::Railties::ActiveJobSerializers::BsonObjectIdSerializer' do
+
+    let(:serializer) { Mongoid::Railties::ActiveJobSerializers::BsonObjectIdSerializer.instance }
+    let(:object_id) { BSON::ObjectId.new }
+
+    describe '#serialize' do
+      it 'serializes BSON::ObjectId' do
+        expect(serializer.serialize(object_id)).to be_a(String)
+      end
     end
-  end
 
-  describe '#deserialize' do
-    it 'deserializes BSON::ObjectId' do
-      expect(serializer.deserialize(serializer.serialize(object_id))).to eq(object_id)
+    describe '#deserialize' do
+      it 'deserializes BSON::ObjectId' do
+        expect(serializer.deserialize(serializer.serialize(object_id))).to eq(object_id)
+      end
     end
   end
+rescue LoadError
+  RSpec.context.skip 'This test requires active_job'
 end