diff --git a/.rubocop.yml b/.rubocop.yml
index 29a94adb1..803c680c4 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -55,6 +55,9 @@ Style/ClassAndModuleChildren:
 Style/OptionalBooleanParameter:
   Enabled: false
 
+Style/OptionHash:
+  Enabled: true
+
 Rails/Date:
   Enabled: true
 
diff --git a/app/controllers/admin/events_controller.rb b/app/controllers/admin/events_controller.rb
index 918558c6f..1ac14dc93 100644
--- a/app/controllers/admin/events_controller.rb
+++ b/app/controllers/admin/events_controller.rb
@@ -90,7 +90,7 @@ def organiser_ids
     params[:event][:organisers]
   end
 
-  def grant_organiser_access(organiser_ids = [])
+  def grant_organiser_access(organiser_ids)
     organiser_ids.each { |id| Member.find(id).add_role(:organiser, @event) }
   end
 
diff --git a/app/controllers/admin/meetings_controller.rb b/app/controllers/admin/meetings_controller.rb
index 111faf9b2..4f4e16def 100644
--- a/app/controllers/admin/meetings_controller.rb
+++ b/app/controllers/admin/meetings_controller.rb
@@ -76,7 +76,7 @@ def chapter_ids
     params[:meeting][:chapters]
   end
 
-  def grant_organiser_access(organiser_ids = [])
+  def grant_organiser_access(organiser_ids)
     organiser_ids.each { |id| Member.find(id).add_role(:organiser, @meeting) }
   end
 
diff --git a/app/controllers/admin/sponsors_controller.rb b/app/controllers/admin/sponsors_controller.rb
index 2581af8bc..fa16493da 100644
--- a/app/controllers/admin/sponsors_controller.rb
+++ b/app/controllers/admin/sponsors_controller.rb
@@ -6,7 +6,7 @@ def index
 
     @chapters = Chapter.all
 
-    @sponsors_search = SponsorsSearch.new(search_params)
+    @sponsors_search = SponsorsSearch.new(**search_params)
     sponsors = @sponsors_search.call
     @pagy, paginated_sponsors = pagy(sponsors)
 
diff --git a/app/controllers/admin/workshops_controller.rb b/app/controllers/admin/workshops_controller.rb
index a18e53635..004ea2e4f 100644
--- a/app/controllers/admin/workshops_controller.rb
+++ b/app/controllers/admin/workshops_controller.rb
@@ -248,7 +248,7 @@ def organiser_ids
     params[:workshop][:organisers]
   end
 
-  def grant_organiser_access(organiser_ids = [])
+  def grant_organiser_access(organiser_ids)
     organiser_ids.each { |id| Member.find(id).add_role(:organiser, @workshop) }
   end
 
diff --git a/app/queries/sponsors_search.rb b/app/queries/sponsors_search.rb
index 01dfdd289..7d01875b7 100644
--- a/app/queries/sponsors_search.rb
+++ b/app/queries/sponsors_search.rb
@@ -3,9 +3,9 @@ class SponsorsSearch
 
   attr_accessor :name, :chapter
 
-  def initialize(params = {})
-    @name = params.fetch(:name)
-    @chapter = params.fetch(:chapter)
+  def initialize(name:, chapter:)
+    @name = name
+    @chapter = chapter
   end
 
   def call
diff --git a/lib/verifier.rb b/lib/verifier.rb
index 949d48435..6898556da 100644
--- a/lib/verifier.rb
+++ b/lib/verifier.rb
@@ -3,9 +3,11 @@
 class Verifier
   attr_reader :id, :token
 
-  def initialize(hash)
-    @id = hash.fetch(:id) { nil }
-    @token = hash.fetch(:token) { nil }
+  def initialize(id: nil, token: nil)
+    raise ArgumentError, 'id or token is required' if id.nil? && token.nil?
+
+    @id = id
+    @token = token
   end
 
   def access_token
diff --git a/spec/queries/sponsors_search_spec.rb b/spec/queries/sponsors_search_spec.rb
index c5c6d44f0..967505631 100644
--- a/spec/queries/sponsors_search_spec.rb
+++ b/spec/queries/sponsors_search_spec.rb
@@ -2,7 +2,7 @@
 
 RSpec.describe SponsorsSearch do
   describe 'initialization' do
-    it 'configures its properties from the param hash' do
+    it 'configures its properties from keyword arguments' do
       search = described_class.new(name: 'Acme', chapter: 'London')
 
       expect(search.name).to eq('Acme')