diff --git a/Gemfile b/Gemfile
index 45c6ef0..ef4ed18 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,8 +9,6 @@ gemspec
 gem 'appraisal'
 gem 'rake'
 gem 'rspec', '~> 3.6'
-gem 'rspec-collection_matchers'
-gem 'rspec-its'
 gem 'webmock', '~> 3.0'
 
 gem 'rake-release', '~> 1.0'
diff --git a/gemfiles/rails_7.2.gemfile b/gemfiles/rails_7.2.gemfile
index 1fc3bda..9375471 100644
--- a/gemfiles/rails_7.2.gemfile
+++ b/gemfiles/rails_7.2.gemfile
@@ -5,8 +5,6 @@ source "https://rubygems.org"
 gem "appraisal"
 gem "rake"
 gem "rspec", "~> 3.6"
-gem "rspec-collection_matchers"
-gem "rspec-its"
 gem "webmock", "~> 3.0"
 gem "rake-release", "~> 1.0"
 gem "activesupport", "~> 7.2.0"
diff --git a/gemfiles/rails_8.0.gemfile b/gemfiles/rails_8.0.gemfile
index 629ec73..6649c0a 100644
--- a/gemfiles/rails_8.0.gemfile
+++ b/gemfiles/rails_8.0.gemfile
@@ -5,8 +5,6 @@ source "https://rubygems.org"
 gem "appraisal"
 gem "rake"
 gem "rspec", "~> 3.6"
-gem "rspec-collection_matchers"
-gem "rspec-its"
 gem "webmock", "~> 3.0"
 gem "rake-release", "~> 1.0"
 gem "activesupport", "~> 8.0.0"
diff --git a/gemfiles/rails_8.1.gemfile b/gemfiles/rails_8.1.gemfile
index aeee44e..569a3dc 100644
--- a/gemfiles/rails_8.1.gemfile
+++ b/gemfiles/rails_8.1.gemfile
@@ -5,8 +5,6 @@ source "https://rubygems.org"
 gem "appraisal"
 gem "rake"
 gem "rspec", "~> 3.6"
-gem "rspec-collection_matchers"
-gem "rspec-its"
 gem "webmock", "~> 3.0"
 gem "rake-release", "~> 1.0"
 gem "activesupport", "~> 8.1.0"
diff --git a/gemfiles/rails_master.gemfile b/gemfiles/rails_master.gemfile
index 80086d2..2d31d9e 100644
--- a/gemfiles/rails_master.gemfile
+++ b/gemfiles/rails_master.gemfile
@@ -5,8 +5,6 @@ source "https://rubygems.org"
 gem "appraisal"
 gem "rake"
 gem "rspec", "~> 3.6"
-gem "rspec-collection_matchers"
-gem "rspec-its"
 gem "webmock", "~> 3.0"
 gem "rake-release", "~> 1.0"
 gem "activesupport", github: "rails/rails"
diff --git a/spec/acfs/collection_spec.rb b/spec/acfs/collection_spec.rb
index 8f51f15..1f76a75 100644
--- a/spec/acfs/collection_spec.rb
+++ b/spec/acfs/collection_spec.rb
@@ -6,7 +6,7 @@
   let(:model) { MyUser }
 
   describe 'Pagination' do
-    subject do
+    subject(:res) do
       Acfs.run
       collection
     end
@@ -24,9 +24,11 @@
             },)
       end
 
-      its(:total_pages) { is_expected.to eq 2 }
-      its(:current_page) { is_expected.to eq 1 }
-      its(:total_count) { is_expected.to eq 10 }
+      it 'exposes pagination headers', :aggregate_failures do
+        expect(res.total_pages).to eq 2
+        expect(res.current_page).to eq 1
+        expect(res.total_count).to eq 10
+      end
     end
 
     context 'with page parameter' do
@@ -41,9 +43,11 @@
             },)
       end
 
-      its(:total_pages) { is_expected.to eq 2 }
-      its(:current_page) { is_expected.to eq 2 }
-      its(:total_count) { is_expected.to eq 10 }
+      it 'exposes pagination headers', :aggregate_failures do
+        expect(res.total_pages).to eq 2
+        expect(res.current_page).to eq 2
+        expect(res.total_count).to eq 10
+      end
     end
 
     context 'with non-numerical page parameter' do
@@ -58,9 +62,11 @@
             },)
       end
 
-      its(:total_pages) { is_expected.to eq 2 }
-      its(:current_page) { is_expected.to eq 'e546f5' }
-      its(:total_count) { is_expected.to eq 10 }
+      it 'exposes pagination headers', :aggregate_failures do
+        expect(res.total_pages).to eq 2
+        expect(res.current_page).to eq 'e546f5'
+        expect(res.total_count).to eq 10
+      end
     end
 
     describe '#next_page' do
diff --git a/spec/acfs/global_spec.rb b/spec/acfs/global_spec.rb
index ddc04b3..5b38751 100644
--- a/spec/acfs/global_spec.rb
+++ b/spec/acfs/global_spec.rb
@@ -31,7 +31,7 @@ def events
 
       it 'triggers event' do
         Acfs.run
-        expect(collector.events).to have(1).items
+        expect(collector.events.size).to eq(1)
       end
     end
 
@@ -42,7 +42,7 @@ def events
 
       it 'triggers event' do
         Acfs.reset
-        expect(collector.events).to have(1).items
+        expect(collector.events.size).to eq(1)
       end
     end
   end
diff --git a/spec/acfs/operation_spec.rb b/spec/acfs/operation_spec.rb
index 3bfd19f..88b0357 100644
--- a/spec/acfs/operation_spec.rb
+++ b/spec/acfs/operation_spec.rb
@@ -6,8 +6,8 @@
   let(:operation) { described_class.new MyUser, :read, params: {id: 0} }
 
   describe '#request' do
-    subject { operation.request }
+    subject(:op_request) { operation.request }
 
-    its(:operation) { is_expected.to eq operation }
+    it { expect(op_request.operation).to eq operation }
   end
 end
diff --git a/spec/acfs/request/callbacks_spec.rb b/spec/acfs/request/callbacks_spec.rb
index 602bf85..7ab34dd 100644
--- a/spec/acfs/request/callbacks_spec.rb
+++ b/spec/acfs/request/callbacks_spec.rb
@@ -10,7 +10,7 @@
     it 'stores a given callback' do
       request.on_complete(&callback)
 
-      expect(request.callbacks).to have(1).item
+      expect(request.callbacks.size).to eq(1)
       expect(request.callbacks[0]).to eq callback
     end
 
@@ -18,7 +18,7 @@
       request.on_complete {|_res| 'abc' }
       request.on_complete(&callback)
 
-      expect(request.callbacks).to have(2).item
+      expect(request.callbacks.size).to eq(2)
       expect(request.callbacks[0]).to eq callback
     end
   end
diff --git a/spec/acfs/resource/locatable_spec.rb b/spec/acfs/resource/locatable_spec.rb
index c4a4ec9..bae5370 100644
--- a/spec/acfs/resource/locatable_spec.rb
+++ b/spec/acfs/resource/locatable_spec.rb
@@ -44,37 +44,31 @@
       context ':list location' do
         let(:action) { :list }
 
-        its(:raw_uri) do
-          is_expected.to eq 'http://users.example.org/users/:user_id/sessions'
-        end
+        it { expect(location.raw_uri).to eq 'http://users.example.org/users/:user_id/sessions' }
       end
 
       context ':create location' do
         let(:action) { :create }
 
-        its(:raw_uri) { is_expected.to eq 'http://users.example.org/sessions' }
+        it { expect(location.raw_uri).to eq 'http://users.example.org/sessions' }
       end
 
       context ':read location' do
         let(:action) { :read }
 
-        its(:raw_uri) { is_expected.to eq 'http://users.example.org/sessions/:id' }
+        it { expect(location.raw_uri).to eq 'http://users.example.org/sessions/:id' }
       end
 
       context ':update location' do
         let(:action) { :update }
 
-        its(:raw_uri) do
-          expect { location }.to raise_error ArgumentError, /update.*disabled/
-        end
+        it { expect { location }.to raise_error ArgumentError, /update.*disabled/ }
       end
 
       context ':delete location' do
         let(:action) { :delete }
 
-        its(:raw_uri) do
-          is_expected.to eq 'http://users.example.org/users/:user_id/sessions/del/:id'
-        end
+        it { expect(location.raw_uri).to eq 'http://users.example.org/users/:user_id/sessions/del/:id' }
       end
     end
   end
diff --git a/spec/acfs/resource/query_methods_spec.rb b/spec/acfs/resource/query_methods_spec.rb
index d2ce3fd..85ac322 100644
--- a/spec/acfs/resource/query_methods_spec.rb
+++ b/spec/acfs/resource/query_methods_spec.rb
@@ -197,7 +197,7 @@
         Acfs.run
 
         expect(computers).to be_loaded
-        expect(computers).to have(3).items
+        expect(computers.size).to eq(3)
         expect(computers[0]).to be_a PC
         expect(computers[1]).to be_a Computer
         expect(computers[2]).to be_a Mac
diff --git a/spec/acfs/resource/validation_spec.rb b/spec/acfs/resource/validation_spec.rb
index 28b7a10..051be59 100644
--- a/spec/acfs/resource/validation_spec.rb
+++ b/spec/acfs/resource/validation_spec.rb
@@ -61,10 +61,9 @@
 
       before { model.valid? }
 
-      it { is_expected.not_to be_empty }
-      it { is_expected.to have(2).items }
-
-      it 'contains a list of error messages' do
+      it 'contains expected errors', :aggregate_failures do
+        expect(errors).not_to be_empty
+        expect(errors.size).to eq(2)
         expect(errors.to_hash).to eq age: ["can't be blank"], name: ['is invalid']
       end
     end
diff --git a/spec/acfs/runner_spec.rb b/spec/acfs/runner_spec.rb
index 351c622..a5eb904 100644
--- a/spec/acfs/runner_spec.rb
+++ b/spec/acfs/runner_spec.rb
@@ -50,24 +50,24 @@ def events
     describe '#process' do
       it 'triggers event' do
         runner.process Acfs::Operation.new MyUser, :read, params: {id: 0}
-        expect(collector.events).to have(1).items
-        expect(collector2.events).to have(1).items
+        expect(collector.events.size).to eq(1)
+        expect(collector2.events.size).to eq(1)
       end
     end
 
     describe '#run' do
       it 'triggers event' do
         runner.run Acfs::Operation.new MyUser, :read, params: {id: 0}
-        expect(collector.events).to have(1).items
-        expect(collector2.events).to have(0).items
+        expect(collector.events.size).to eq(1)
+        expect(collector2.events.size).to eq(0)
       end
     end
 
     describe '#enqueue' do
       it 'triggers event' do
         runner.enqueue Acfs::Operation.new MyUser, :read, params: {id: 0}
-        expect(collector.events).to have(1).items
-        expect(collector2.events).to have(0).items
+        expect(collector.events.size).to eq(1)
+        expect(collector2.events.size).to eq(0)
       end
     end
   end
diff --git a/spec/acfs/stub_spec.rb b/spec/acfs/stub_spec.rb
index fbdad3f..94a5ddd 100644
--- a/spec/acfs/stub_spec.rb
+++ b/spec/acfs/stub_spec.rb
@@ -140,7 +140,7 @@ class SpecialCustomError < StandardError; end
         users = MyUser.all
         Acfs.run
 
-        expect(users).to have(2).items
+        expect(users.size).to eq(2)
       end
 
       it 'returns defined resources' do
@@ -169,7 +169,7 @@ class SpecialCustomError < StandardError; end
       end
 
       context 'with header' do
-        subject do
+        subject(:comments_result) do
           Acfs.run
           comments
         end
@@ -188,8 +188,10 @@ class SpecialCustomError < StandardError; end
           }
         end
 
-        its(:total_pages) { is_expected.to eq 2 }
-        its(:total_count) { is_expected.to eq 10 }
+        it 'exposes pagination headers', :aggregate_failures do
+          expect(comments_result.total_pages).to eq 2
+          expect(comments_result.total_count).to eq 10
+        end
       end
     end
 
diff --git a/spec/acfs_spec.rb b/spec/acfs_spec.rb
index 82b9c5a..cc867f5 100644
--- a/spec/acfs_spec.rb
+++ b/spec/acfs_spec.rb
@@ -155,7 +155,7 @@
     Acfs.run
 
     expect(users).to be_loaded
-    expect(users).to have(3).items
+    expect(users.size).to eq(3)
 
     expect(users[0].id).to eq 2
     expect(users[0].name).to eq 'John'
@@ -181,7 +181,7 @@
     Acfs.run
 
     expect(users).to be_loaded
-    expect(users).to have(2).items
+    expect(users.size).to eq(2)
     expect(users[0].name).to eq 'Anon'
     expect(users[0].age).to eq 12
     expect(users[1].name).to eq 'John'
@@ -201,7 +201,7 @@
     expect(user.name).to eq 'John'
     expect(user.age).to eq 26
 
-    expect(friends).to have(1).items
+    expect(friends.size).to eq(1)
   end
 
   it 'loads associated resources from different service' do
@@ -218,6 +218,6 @@
     expect(user.name).to eq 'John'
     expect(user.age).to eq 26
 
-    expect(comments).to have(2).items
+    expect(comments.size).to eq(2)
   end
 end