diff --git a/CHANGELOG.md b/CHANGELOG.md
index b16cddbc..67faf03b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Changed
+
+- Explicitly require less of `active_support` (#837)
+
 ## 2.4.0 (2024-08-26)
 
 ## Changed
diff --git a/lib/pundit.rb b/lib/pundit.rb
index a7263b39..0bb9e88c 100644
--- a/lib/pundit.rb
+++ b/lib/pundit.rb
@@ -1,12 +1,9 @@
 # frozen_string_literal: true
 
+require "active_support"
+
 require "pundit/version"
 require "pundit/policy_finder"
-require "active_support/concern"
-require "active_support/core_ext/string/inflections"
-require "active_support/core_ext/object/blank"
-require "active_support/core_ext/module/introspection"
-require "active_support/dependencies/autoload"
 require "pundit/authorization"
 require "pundit/context"
 require "pundit/cache_store/null_store"
diff --git a/lib/pundit/policy_finder.rb b/lib/pundit/policy_finder.rb
index ecc6e9bb..a2150080 100644
--- a/lib/pundit/policy_finder.rb
+++ b/lib/pundit/policy_finder.rb
@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+# String#safe_constantize, String#demodulize, String#underscore, String#camelize
+require "active_support/core_ext/string/inflections"
+
 module Pundit
   # Finds policy and scope classes for given object.
   # @api public
diff --git a/lib/pundit/rspec.rb b/lib/pundit/rspec.rb
index fb44ba60..cafc5913 100644
--- a/lib/pundit/rspec.rb
+++ b/lib/pundit/rspec.rb
@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+# Array#to_sentence
+require "active_support/core_ext/array/conversions"
+
 module Pundit
   module RSpec
     module Matchers
diff --git a/pundit.gemspec b/pundit.gemspec
index 18a97bf7..a5b54b0f 100644
--- a/pundit.gemspec
+++ b/pundit.gemspec
@@ -22,11 +22,10 @@ Gem::Specification.new do |gem|
   gem.metadata      = { "rubygems_mfa_required" => "true" }
 
   gem.add_dependency "activesupport", ">= 3.0.0"
-  gem.add_development_dependency "actionpack", ">= 3.0.0"
-  gem.add_development_dependency "activemodel", ">= 3.0.0"
+  gem.add_development_dependency "actionpack", ">= 3.0.0" # Used to test strong parameters.
+  gem.add_development_dependency "activemodel", ">= 3.0.0" # Used to test ActiveModel::Naming.
   gem.add_development_dependency "bundler"
-  gem.add_development_dependency "pry"
-  gem.add_development_dependency "railties", ">= 3.0.0"
+  gem.add_development_dependency "railties", ">= 3.0.0" # Used to test generators.
   gem.add_development_dependency "rake"
   gem.add_development_dependency "rspec", ">= 3.0.0"
   gem.add_development_dependency "rubocop"
diff --git a/spec/authorization_spec.rb b/spec/authorization_spec.rb
index 8bfa3fcb..ca291f9a 100644
--- a/spec/authorization_spec.rb
+++ b/spec/authorization_spec.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "spec_helper"
+require "action_controller/metal/strong_parameters"
 
 describe Pundit::Authorization do
   def to_params(*args, **kwargs, &block)
@@ -157,7 +158,7 @@ def to_params(*args, **kwargs, &block)
     end
 
     it "allows policy to be injected" do
-      new_policy = OpenStruct.new
+      new_policy = double
       controller.policies[post] = new_policy
 
       expect(controller.policy(post)).to eq new_policy
@@ -182,7 +183,7 @@ def to_params(*args, **kwargs, &block)
     end
 
     it "allows policy_scope to be injected" do
-      new_scope = OpenStruct.new
+      new_scope = double
       controller.policy_scopes[Post] = new_scope
 
       expect(controller.policy_scope(Post)).to eq new_scope
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 6d63c514..4b932571 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -20,14 +20,7 @@
 
 require "pundit"
 require "pundit/rspec"
-
-require "rack"
-require "rack/test"
-require "pry"
-require "active_support"
-require "active_support/core_ext"
 require "active_model/naming"
-require "action_controller/metal/strong_parameters"
 
 # Load all supporting files: models, policies, etc.
 require "zeitwerk"
diff --git a/spec/support/models/customer/post.rb b/spec/support/models/customer/post.rb
index 0b08c654..3562e127 100644
--- a/spec/support/models/customer/post.rb
+++ b/spec/support/models/customer/post.rb
@@ -2,9 +2,7 @@
 
 module Customer
   class Post < ::Post
-    def model_name
-      OpenStruct.new(param_key: "customer_post")
-    end
+    extend ActiveModel::Naming
 
     def self.policy_class
       PostPolicy