diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 3ca89b264..85df1262f 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config --auto-gen-only-exclude --no-exclude-limit`
-# on 2026-07-28 13:09:10 UTC using RuboCop version 1.88.2.
+# on 2026-07-28 13:24:16 UTC using RuboCop version 1.88.2.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -28,12 +28,6 @@ Lint/AmbiguousBlockAssociation:
     - 'spec/models/feedback_spec.rb'
     - 'spec/services/three_month_email_service_spec.rb'
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-Lint/AmbiguousOperator:
-  Exclude:
-    - 'spec/controllers/admin/workshops_controller_spec.rb'
-
 # Offense count: 2
 # This cop supports unsafe autocorrection (--autocorrect-all).
 # Configuration parameters: AllowSafeAssignment.
@@ -62,12 +56,6 @@ Lint/MissingSuper:
   Exclude:
     - 'app/components/event_card_component.rb'
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-Lint/RedundantStringCoercion:
-  Exclude:
-    - 'spec/features/admin/sponsor_spec.rb'
-
 # Offense count: 1
 # Configuration parameters: AllowKeywordBlockArguments.
 Lint/UnderscorePrefixedVariableName:
@@ -273,12 +261,6 @@ RSpec/AnyInstance:
     - 'spec/controllers/member/details_controller_spec.rb'
     - 'spec/support/helpers/login_helpers.rb'
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-RSpec/BeEmpty:
-  Exclude:
-    - 'spec/presenters/event_presenter_spec.rb'
-
 # Offense count: 25
 # This cop supports unsafe autocorrection (--autocorrect-all).
 RSpec/BeEq:
@@ -294,13 +276,6 @@ RSpec/BeEq:
     - 'spec/presenters/workshop_presenter_spec.rb'
     - 'spec/support/shared_examples/behaves_like_an_invitation_route.rb'
 
-# Offense count: 3
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: NegatedMatcher.
-RSpec/ChangeByZero:
-  Exclude:
-    - 'spec/controllers/admin/sponsors_controller_spec.rb'
-
 # Offense count: 67
 # This cop supports safe autocorrection (--autocorrect).
 RSpec/ContextMethod:
@@ -515,14 +490,6 @@ RSpec/InstanceVariable:
     - 'spec/features/admin/add_user_to_workshop_spec.rb'
     - 'spec/features/member_feedback_spec.rb'
 
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: it_behaves_like, it_should_behave_like
-RSpec/ItBehavesLike:
-  Exclude:
-    - 'spec/models/workshop_spec.rb'
-
 # Offense count: 1
 RSpec/LeakyConstantDeclaration:
   Exclude:
@@ -773,14 +740,6 @@ Rails/Blank:
     - 'app/controllers/application_controller.rb'
     - 'lib/omniauth/strategies/codebar.rb'
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: slashes, arguments
-Rails/FilePath:
-  Exclude:
-    - 'spec/controllers/admin/sponsors_controller_spec.rb'
-
 # Offense count: 1
 # This cop supports unsafe autocorrection (--autocorrect-all).
 # Configuration parameters: AllowedMethods, AllowedPatterns.
@@ -870,34 +829,6 @@ Rails/UniqueValidationWithoutIndex:
     - 'app/models/workshop_invitation.rb'
     - 'app/models/workshop_sponsor.rb'
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: Keywords, RequireColon.
-# Keywords: TODO, FIXME, OPTIMIZE, HACK, REVIEW, NOTE
-Style/CommentAnnotation:
-  Exclude:
-    - 'spec/services/invitation_manager_spec.rb'
-
-# Offense count: 4
-# This cop supports safe autocorrection (--autocorrect).
-Style/DefWithParentheses:
-  Exclude:
-    - 'app/helpers/email_header_helper.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-Style/ExpandPathArguments:
-  Exclude:
-    - 'spec/spec_helper.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: braces, no_braces
-Style/HashAsLastArrayItem:
-  Exclude:
-    - 'app/models/sponsor.rb'
-
 # Offense count: 1
 # This cop supports unsafe autocorrection (--autocorrect-all).
 # Configuration parameters: InverseMethods, InverseBlocks.
@@ -905,36 +836,12 @@ Style/InverseMethods:
   Exclude:
     - 'app/controllers/admin/chapters_controller.rb'
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: line_count_dependent, lambda, literal
-Style/Lambda:
-  Exclude:
-    - 'app/models/workshop_invitation.rb'
-
 # Offense count: 1
 # This cop supports unsafe autocorrection (--autocorrect-all).
 Style/LineEndConcatenation:
   Exclude:
     - 'spec/presenters/address_presenter_spec.rb'
 
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: both, prefix, postfix
-Style/NegatedIf:
-  Exclude:
-    - 'lib/tasks/setup.rake'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedOctalStyle.
-# SupportedOctalStyles: zero_with_o, zero_only
-Style/NumericLiteralPrefix:
-  Exclude:
-    - 'spec/features/admin/workshops_spec.rb'
-
 # Offense count: 3
 # This cop supports unsafe autocorrection (--autocorrect-all).
 # Configuration parameters: EnforcedStyle, AllowedMethods, AllowedPatterns.
@@ -958,21 +865,6 @@ Style/RedundantInterpolation:
     - 'script/benchmark_events.rb'
     - 'spec/features/admin/sponsor_spec.rb'
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: AllowMultipleReturnValues.
-Style/RedundantReturn:
-  Exclude:
-    - 'lib/omniauth/strategies/codebar.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle, AllowInnerSlashes.
-# SupportedStyles: slashes, percent_r, mixed
-Style/RegexpLiteral:
-  Exclude:
-    - 'spec/spec_helper.rb'
-
 # Offense count: 1
 # This cop supports unsafe autocorrection (--autocorrect-all).
 # Configuration parameters: ConvertCodeThatCanStartToReturnNil, AllowedMethods, MaxChainLength.
diff --git a/app/helpers/email_header_helper.rb b/app/helpers/email_header_helper.rb
index 418dd5adb..4af6fd728 100644
--- a/app/helpers/email_header_helper.rb
+++ b/app/helpers/email_header_helper.rb
@@ -1,9 +1,9 @@
 module EmailHeaderHelper
   class SkippedEmail
-    def deliver_now() = self
-    def deliver_later() = self
-    def deliver() = self
-    def deliver!() = self
+    def deliver_now = self
+    def deliver_later = self
+    def deliver = self
+    def deliver! = self
   end
 
   private
diff --git a/app/models/sponsor.rb b/app/models/sponsor.rb
index 52b5b8ce3..a4ab7caa7 100644
--- a/app/models/sponsor.rb
+++ b/app/models/sponsor.rb
@@ -19,7 +19,7 @@ class Sponsor < ApplicationRecord
            class_name: 'Sponsorship', inverse_of: :sponsor
   has_many :events, through: :event_sponsorships
   has_many :workshop_sponsors, lambda {
-    includes([workshop: :chapter])
+    includes([{ workshop: :chapter }])
       .joins(:workshop)
       .order('workshops.date_and_time desc')
   },
diff --git a/app/models/workshop_invitation.rb b/app/models/workshop_invitation.rb
index df46751d6..ee5a7dfff 100644
--- a/app/models/workshop_invitation.rb
+++ b/app/models/workshop_invitation.rb
@@ -23,7 +23,7 @@ class WorkshopInvitation < ApplicationRecord
   scope :last_six_months, -> { joins(:workshop).where(workshops: { date_and_time: 6.months.ago...Time.zone.now }) }
   scope :not_reminded, -> { where(reminded_at: nil) }
   scope :on_waiting_list, -> { joins(:waiting_list) }
-  scope :with_notes_and_their_authors, -> {
+  scope :with_notes_and_their_authors, lambda {
  includes(member: [{ member_notes: :author }, :attendance_warnings]).includes(:overrider)
   }
 
diff --git a/lib/omniauth/strategies/codebar.rb b/lib/omniauth/strategies/codebar.rb
index 461082207..f6de6c965 100644
--- a/lib/omniauth/strategies/codebar.rb
+++ b/lib/omniauth/strategies/codebar.rb
@@ -107,7 +107,7 @@ def callback_phase
       rescue StandardError => e
         return if env['omniauth.error']
 
-        return fail!(:unknown_error, e)
+        fail!(:unknown_error, e)
       end
 
       private
diff --git a/lib/tasks/setup.rake b/lib/tasks/setup.rake
index d493a9f44..fd887a223 100644
--- a/lib/tasks/setup.rake
+++ b/lib/tasks/setup.rake
@@ -93,7 +93,7 @@ namespace :setup do
     end
 
     def check_postgresql
-      if !system('which psql > /dev/null 2>&1')
+      unless system('which psql > /dev/null 2>&1')
         error('PostgreSQL', 'psql not found',
               'Install: brew install postgresql && brew services start postgresql (macOS)' \
               ' or see docs/development-setup.md')
@@ -128,7 +128,7 @@ namespace :setup do
     end
 
     def check_github_credentials
-      if !File.exist?('mise.local.toml')
+      unless File.exist?('mise.local.toml')
         error('GitHub OAuth', 'mise.local.toml not found',
               'Copy: cp mise.local.toml.example mise.local.toml, then edit with your GitHub app credentials.')
         return
diff --git a/spec/controllers/admin/sponsors_controller_spec.rb b/spec/controllers/admin/sponsors_controller_spec.rb
index 14f6174bc..e5aaf5ed5 100644
--- a/spec/controllers/admin/sponsors_controller_spec.rb
+++ b/spec/controllers/admin/sponsors_controller_spec.rb
@@ -3,7 +3,7 @@
   let(:member1) { Fabricate(:member) }
   let(:address) { Fabricate(:address) }
   let(:admin) { Fabricate(:chapter_organiser) }
-  let(:avatar) { Rack::Test::UploadedFile.new(Rails.root.join('app', 'assets', 'images', 'logo.png'), 'image/png') }
+  let(:avatar) { Rack::Test::UploadedFile.new(Rails.root.join('app/assets/images/logo.png'), 'image/png') }
   let(:sponsor) { Fabricate(:sponsor) }
 
   describe 'POST #create' do
@@ -15,7 +15,7 @@
             address: address, avatar: avatar, members: [1, 2]
           }
         }
-      end.to change(Sponsor, :count).by(0)
+      end.not_to change(Sponsor, :count)
     end
 
     it "Doesn't allow regular users to create sponsors" do
@@ -28,7 +28,7 @@
             address: address, avatar: avatar
           }
         }
-      end.to change(Sponsor, :count).by(0)
+      end.not_to change(Sponsor, :count)
     end
 
     context 'Allows chapter organisers to create sponsors with' do
@@ -98,7 +98,7 @@
             address: '', avatar: '', members: []
           }
         }
-      end.to change(Sponsor, :count).by(0)
+      end.not_to change(Sponsor, :count)
     end
   end
 
diff --git a/spec/controllers/admin/workshops_controller_spec.rb b/spec/controllers/admin/workshops_controller_spec.rb
index fca26ee61..b7eeea555 100644
--- a/spec/controllers/admin/workshops_controller_spec.rb
+++ b/spec/controllers/admin/workshops_controller_spec.rb
@@ -73,7 +73,7 @@
         it 'should successfully delete the workshop' do
           expect do
             delete :destroy, params: { id: workshop.id }
-          end.to change { Workshop.count }.by -1
+          end.to change { Workshop.count }.by(-1)
         end
 
         it 'should display workshop deleted successfully related flash message' do
diff --git a/spec/features/admin/sponsor_spec.rb b/spec/features/admin/sponsor_spec.rb
index 7349e597d..76dc7b01b 100644
--- a/spec/features/admin/sponsor_spec.rb
+++ b/spec/features/admin/sponsor_spec.rb
@@ -136,7 +136,7 @@
 
         within '#sponsorships' do
           expect(page).to have_text('Events')
-          expect(page).to have_text("#{gold_event.to_s} - GOLD")
+          expect(page).to have_text("#{gold_event} - GOLD")
           expect(page).to have_text("#{silver_event} - SILVER")
           expect(page).to have_text("#{standard_event} - Standard")
         end
diff --git a/spec/features/admin/workshops_spec.rb b/spec/features/admin/workshops_spec.rb
index 881b59152..140c3d102 100644
--- a/spec/features/admin/workshops_spec.rb
+++ b/spec/features/admin/workshops_spec.rb
@@ -40,7 +40,7 @@
   context '#creation' do
     context 'creating a workshop' do
       around do |example|
-        travel_to Time.zone.local(2020, 12, 01, 0, 0, 0)
+        travel_to Time.zone.local(2020, 12, 0o1, 0, 0, 0)
         example.run
         travel_back
       end
diff --git a/spec/models/workshop_spec.rb b/spec/models/workshop_spec.rb
index 30928f04c..446166b7e 100644
--- a/spec/models/workshop_spec.rb
+++ b/spec/models/workshop_spec.rb
@@ -109,11 +109,11 @@
       end
 
       context 'with rsvp_open' do
-        it_should_behave_like 'date_time_fields_must_be_paired', 'rsvp_open'
+        it_behaves_like 'date_time_fields_must_be_paired', 'rsvp_open'
       end
 
       context 'with rsvp_close' do
-        it_should_behave_like 'date_time_fields_must_be_paired', 'rsvp_close'
+        it_behaves_like 'date_time_fields_must_be_paired', 'rsvp_close'
       end
     end
 
diff --git a/spec/presenters/event_presenter_spec.rb b/spec/presenters/event_presenter_spec.rb
index 675501647..ffd129f19 100644
--- a/spec/presenters/event_presenter_spec.rb
+++ b/spec/presenters/event_presenter_spec.rb
@@ -30,7 +30,7 @@
 
   describe '#organisers' do
     it 'when there are no organisers' do
-      expect(event.organisers).to match_array([])
+      expect(event.organisers).to be_empty
     end
 
     it 'when there are organisers' do
diff --git a/spec/services/invitation_manager_spec.rb b/spec/services/invitation_manager_spec.rb
index 5eb191d2b..715a25cc4 100644
--- a/spec/services/invitation_manager_spec.rb
+++ b/spec/services/invitation_manager_spec.rb
@@ -145,7 +145,7 @@
   end
 
   describe '#send_workshop_waiting_list_reminders', :wip do
-    # Note: This test is WIP because the method is async
+    # NOTE: This test is WIP because the method is async
     it 'emails everyone that hasn\'t already been reminded from the workshop\'s waitinglist' do
       workshop = Fabricate(:workshop)
       invitations = Fabricate.times(2, :waitinglist_invitation, workshop: workshop)
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 22c232bea..659006747 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -37,7 +37,7 @@
 end
 
 ENV['RAILS_ENV'] ||= 'test'
-require File.expand_path('../../config/environment', __FILE__)
+require File.expand_path('../config/environment', __dir__)
 require 'rspec/rails'
 
 # Block all external HTTP requests in tests; allows localhost for Capybara
@@ -70,7 +70,7 @@
   config.before(:each) do
     # Stub all Flodesk API endpoints globally so tests don't make external requests
     # when fabricating members (which trigger Subscription.after_create callback)
-    WebMock.stub_request(:any, %r{api\.flodesk\.com})
+    WebMock.stub_request(:any, /api\.flodesk\.com/)
            .to_return(status: 200, body: '{"status":"active","segments":[]}', headers: { 'Content-Type' => 'application/json' })
 
     DatabaseCleaner.strategy = :transaction