diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index f804a21de8..2da948106f 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -586,6 +586,10 @@ 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
@@ -727,6 +731,19 @@ buildvariants:
   tasks:
     - name: "test"
 
+- matrix_name: "rails-8"
+  matrix_spec:
+    ruby: ["ruby-3.2"]
+    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: "bson-min"
   matrix_spec:
     driver: [bson-min]
diff --git a/.evergreen/config/axes.yml.erb b/.evergreen/config/axes.yml.erb
index e654086105..546225f54b 100644
--- a/.evergreen/config/axes.yml.erb
+++ b/.evergreen/config/axes.yml.erb
@@ -213,6 +213,10 @@ 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/variants.yml.erb b/.evergreen/config/variants.yml.erb
index 1911f8c902..656d6ba49b 100644
--- a/.evergreen/config/variants.yml.erb
+++ b/.evergreen/config/variants.yml.erb
@@ -111,6 +111,19 @@ buildvariants:
   tasks:
     - name: "test"
 
+- matrix_name: "rails-8"
+  matrix_spec:
+    ruby: ["ruby-3.2"]
+    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: "bson-min"
   matrix_spec:
     driver: [bson-min]
@@ -158,14 +171,40 @@ buildvariants:
   tasks:
      - name: "test"
 
-- matrix_name: app-tests-rails-7
+- matrix_name: app-tests-rails-master
+  matrix_spec:
+    ruby: ["ruby-3.1", "ruby-3.2"]
+    driver: ["current"]
+    mongodb-version: '7.0'
+    topology: standalone
+    app-tests: yes
+    rails: ['master']
+    os: ubuntu-20.04
+  display_name: "app tests ${driver}, ${ruby}, ${rails}"
+  tasks:
+    - name: "test"
+
+- matrix_name: app-tests-rails-8
   matrix_spec:
     ruby: ["ruby-3.1", "ruby-3.2"]
     driver: ["current"]
-    mongodb-version: '6.0'
+    mongodb-version: '7.0'
     topology: standalone
     app-tests: yes
-    rails: ['6.1', '7.0', '7.1', '7.2']
+    rails: ['8.0']
+    os: ubuntu-20.04
+  display_name: "app tests ${driver}, ${ruby}, ${rails}"
+  tasks:
+    - name: "test"
+
+- matrix_name: app-tests-rails-7
+  matrix_spec:
+    ruby: ["ruby-3.2"]
+    driver: ["current"]
+    mongodb-version: '7.0'
+    topology: standalone
+    app-tests: yes
+    rails: ['7.0', '7.1', '7.2']
     os: ubuntu-20.04
   display_name: "app tests ${driver}, ${ruby}, ${rails}"
   tasks:
@@ -178,7 +217,7 @@ buildvariants:
     mongodb-version: '5.0'
     topology: standalone
     app-tests: yes
-    rails: ['6.0']
+    rails: ['6.0', '6.1']
     os: rhel80
   display_name: "app tests ${driver}, ${ruby}, ${rails}"
   tasks:
diff --git a/.evergreen/run-tests.sh b/.evergreen/run-tests.sh
index ff5f5c1a3f..4ea2151a2f 100755
--- a/.evergreen/run-tests.sh
+++ b/.evergreen/run-tests.sh
@@ -123,6 +123,6 @@ 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/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..b83e3108a5
--- /dev/null
+++ b/gemfiles/rails-8.0.gemfile
@@ -0,0 +1,14 @@
+# rubocop:todo all
+source 'https://rubygems.org'
+
+gem 'actionpack', '8.0.0.beta1'
+gem 'activemodel', '8.0.0.beta1'
+
+group :test do
+  gem 'activejob', '8.0.0.beta1'
+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/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/mongoid/railties/bson_object_id_serializer_spec.rb b/spec/mongoid/railties/bson_object_id_serializer_spec.rb
index 694e14232c..9a446120f8 100644
--- a/spec/mongoid/railties/bson_object_id_serializer_spec.rb
+++ b/spec/mongoid/railties/bson_object_id_serializer_spec.rb
@@ -2,6 +2,8 @@
 # rubocop:todo all
 
 require 'spec_helper'
+RSpec.context.skip 'This test requires Rails version specified' if ENV['RAILS'].nil?
+
 require 'active_job'
 require 'mongoid/railties/bson_object_id_serializer'