diff --git a/Gemfile b/Gemfile
index 7dd4b17..b409724 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ gemspec
 gem 'bundler'
 gem 'rake'
 gem 'pry-byebug'
-gem 'mongoid', '~> 8'
+gem 'mongoid', '~> 9'
 
 group :test do
   gem 'rspec-given', '~> 3.5'
diff --git a/Gemfile.lock b/Gemfile.lock
index a494ebf..00b3f20 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,68 +2,77 @@ PATH
   remote: .
   specs:
     mongoid_includes (3.0.2)
-      mongoid (>= 7.0.10, < 9.0.0)
+      mongoid (>= 7.0.10, < 10.0.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (7.0.4)
-      activesupport (= 7.0.4)
-    activesupport (7.0.4)
+    activemodel (7.1.3.4)
+      activesupport (= 7.1.3.4)
+    activesupport (7.1.3.4)
+      base64
+      bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
+      connection_pool (>= 2.2.5)
+      drb
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
+      mutex_m
       tzinfo (~> 2.0)
-    bson (4.15.0)
+    base64 (0.2.0)
+    bigdecimal (3.1.8)
+    bson (5.0.1)
     byebug (11.1.3)
     coderay (1.1.3)
-    concurrent-ruby (1.1.10)
-    diff-lcs (1.4.4)
+    concurrent-ruby (1.3.3)
+    connection_pool (2.4.1)
+    diff-lcs (1.5.1)
     docile (1.3.2)
-    given_core (3.8.1)
+    drb (2.2.1)
+    given_core (3.8.2)
       sorcerer (>= 0.3.7)
-    i18n (1.12.0)
+    i18n (1.14.5)
       concurrent-ruby (~> 1.0)
     json (2.3.1)
-    method_source (1.0.0)
-    minitest (5.16.3)
-    mongo (2.18.1)
-      bson (>= 4.14.1, < 5.0.0)
-    mongoid (8.0.2)
-      activemodel (>= 5.1, < 7.1, != 7.0.0)
+    method_source (1.1.0)
+    minitest (5.24.1)
+    mongo (2.20.1)
+      bson (>= 4.14.1, < 6.0.0)
+    mongoid (9.0.1)
+      activemodel (>= 5.1, < 7.2, != 7.0.0)
+      concurrent-ruby (>= 1.0.5, < 2.0)
       mongo (>= 2.18.0, < 3.0.0)
-      ruby2_keywords (~> 0.0.5)
-    pry (0.13.1)
+    mutex_m (0.2.0)
+    pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    pry-byebug (3.9.0)
+    pry-byebug (3.10.1)
       byebug (~> 11.0)
-      pry (~> 0.13.0)
+      pry (>= 0.13, < 0.15)
     rake (13.0.1)
-    rspec (3.9.0)
-      rspec-core (~> 3.9.0)
-      rspec-expectations (~> 3.9.0)
-      rspec-mocks (~> 3.9.0)
-    rspec-core (3.9.3)
-      rspec-support (~> 3.9.3)
-    rspec-expectations (3.9.3)
+    rspec (3.13.0)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.0)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.1)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.9.0)
-    rspec-given (3.8.1)
-      given_core (= 3.8.1)
+      rspec-support (~> 3.13.0)
+    rspec-given (3.8.2)
+      given_core (= 3.8.2)
       rspec (>= 2.14.0)
-    rspec-mocks (3.9.1)
+    rspec-mocks (3.13.1)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.9.0)
-    rspec-support (3.9.4)
-    ruby2_keywords (0.0.5)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.1)
     simplecov (0.17.1)
       docile (~> 1.1)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
     sorcerer (2.0.1)
-    tzinfo (2.0.5)
+    tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
 
 PLATFORMS
@@ -71,7 +80,7 @@ PLATFORMS
 
 DEPENDENCIES
   bundler
-  mongoid (~> 8)
+  mongoid (~> 9)
   mongoid_includes!
   pry-byebug
   rake
diff --git a/lib/mongoid_includes.rb b/lib/mongoid_includes.rb
index bcf12ce..fb8f90f 100644
--- a/lib/mongoid_includes.rb
+++ b/lib/mongoid_includes.rb
@@ -9,4 +9,8 @@
 Mongoid::Contextual::Memory.send :prepend, Mongoid::Includes::EagerLoad
 
 Mongoid::Criteria.send :prepend, Mongoid::Includes::Criteria
-Mongoid::Association::Referenced::Eager::Base.send :prepend, Mongoid::Includes::Association::Eager
+if defined?(Mongoid::Association::Referenced::Eager::Base)
+  Mongoid::Association::Referenced::Eager::Base.send :prepend, Mongoid::Includes::Association::Eager
+else
+  Mongoid::Association::Eager.send :prepend, Mongoid::Includes::Association::Eager
+end
diff --git a/mongoid_includes.gemspec b/mongoid_includes.gemspec
index 9ac838b..12091d4 100644
--- a/mongoid_includes.gemspec
+++ b/mongoid_includes.gemspec
@@ -22,5 +22,5 @@ Gem::Specification.new do |s|
   s.files        = Dir.glob('lib/**/*') + %w(CHANGELOG.md LICENSE.txt README.md Rakefile)
   s.test_files   = Dir.glob('spec/**/*')
 
-  s.add_runtime_dependency 'mongoid', ['>= 7.0.10', '< 9.0.0']
+  s.add_runtime_dependency 'mongoid', ['>= 7.0.10', '< 10.0.0']
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index a7c7b33..55c51d9 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -54,3 +54,5 @@ def log_mongo_to_console
     Mongoid.purge!
   end
 end
+
+Time.zone = 'UTC'