diff --git a/app/models/registration.rb b/app/models/registration.rb
index 9c920c34..443fe2d7 100644
--- a/app/models/registration.rb
+++ b/app/models/registration.rb
@@ -174,7 +174,7 @@ def update_payment_lane(id, iso_amount, currency_iso, status)
   # Dynamoid doesn't have a find_or_create_by so we need to use upsert
   # There are no validations to run anyway
   def update_waiting_list(update_params)
-    raise ArgumentError, 'Can only accept waiting list leader' if waiting_list_position != 1 && update_params[:status] == 'accepted'
+    raise ArgumentError.new('Can only accept waiting list leader') if waiting_list_position != 1 && update_params[:status] == 'accepted'
 
     waiting_list = WaitingList.find(competition_id)
     waiting_list.add(self.user_id) if update_params[:status] == 'waiting_list'
diff --git a/app/models/waiting_list.rb b/app/models/waiting_list.rb
index a86cdb89..076b20c8 100644
--- a/app/models/waiting_list.rb
+++ b/app/models/waiting_list.rb
@@ -21,7 +21,7 @@ def add(user_id)
   end
 
   def move_to_position(user_id, new_position)
-    raise ArgumentError, 'Target position out of waiting list range' if new_position > entries.length || new_position < 1
+    raise ArgumentError.new('Target position out of waiting list range') if new_position > entries.length || new_position < 1
 
     old_index = entries.find_index(user_id)
     return if old_index == new_position-1
diff --git a/app/services/registration_checker.rb b/app/services/registration_checker.rb
index 1b280bd1..09aaea5c 100644
--- a/app/services/registration_checker.rb
+++ b/app/services/registration_checker.rb
@@ -150,7 +150,7 @@ def validate_update_status!
         new_status == 'accepted' && Registration.accepted_competitors_count(@competition_info.competition_id) == @competition_info.competitor_limit
 
       # Organizers cant accept someone from the waiting list who isn't in the leading position
-      waiting_list = begin
+      begin
         WaitingList.find(@competition_info.id)
       rescue Dynamoid::Errors::RecordNotFound
         WaitingList.create(id: @competition_info.id, entries: [])
diff --git a/spec/factories/waiting_list_factory.rb b/spec/factories/waiting_list_factory.rb
index 70ded476..e50a58c2 100644
--- a/spec/factories/waiting_list_factory.rb
+++ b/spec/factories/waiting_list_factory.rb
@@ -4,7 +4,7 @@
 
 FactoryBot.define do
   factory :waiting_list do
-    transient do 
+    transient do
       populate { nil }
     end
 
diff --git a/spec/services/registration_checker_spec.rb b/spec/services/registration_checker_spec.rb
index 616a3202..ed6c7331 100644
--- a/spec/services/registration_checker_spec.rb
+++ b/spec/services/registration_checker_spec.rb
@@ -9,7 +9,7 @@
   it "user cant change 'status' => #{old_status} to: #{new_status}" do
     registration = FactoryBot.create(:registration, registration_status: old_status)
     if old_status == 'waiting_list'
-      waiting_list = FactoryBot.create(:waiting_list, entries: [registration.user_id])
+      FactoryBot.create(:waiting_list, entries: [registration.user_id])
     end
     competition_info = CompetitionInfo.new(FactoryBot.build(:competition))
     update_request = FactoryBot.build(:update_request, user_id: registration[:user_id], competing: { 'status' => new_status })
@@ -28,7 +28,7 @@
   it "organizer can change 'status' => #{old_status} to: #{new_status} before close" do
     registration = FactoryBot.create(:registration, registration_status: old_status)
     if old_status == 'waiting_list'
-      waiting_list = FactoryBot.create(:waiting_list, entries: [registration.user_id])
+      FactoryBot.create(:waiting_list, entries: [registration.user_id])
     end
     competition_info = CompetitionInfo.new(FactoryBot.build(:competition))
     update_request = FactoryBot.build(:update_request, :organizer_for_user, user_id: registration[:user_id], competing: { 'status' => new_status })
@@ -45,7 +45,7 @@
   it "site admin can change 'status' => #{old_status} to: #{new_status} before close" do
     registration = FactoryBot.create(:registration, registration_status: old_status)
     if old_status == 'waiting_list'
-      waiting_list = FactoryBot.create(:waiting_list, entries: [registration.user_id])
+      FactoryBot.create(:waiting_list, entries: [registration.user_id])
     end
     competition_info = CompetitionInfo.new(FactoryBot.build(:competition))
     update_request = FactoryBot.build(:update_request, :site_admin, user_id: registration[:user_id], competing: { 'status' => new_status })
@@ -62,7 +62,7 @@
   it "after edit deadline/reg close, organizer can change 'status' => #{old_status} to: #{new_status}" do
     registration = FactoryBot.create(:registration, registration_status: old_status)
     if old_status == 'waiting_list'
-      waiting_list = FactoryBot.create(:waiting_list, entries: [registration.user_id])
+      FactoryBot.create(:waiting_list, entries: [registration.user_id])
     end
     competition_info = CompetitionInfo.new(FactoryBot.build(:competition, :closed))
     update_request = FactoryBot.build(:update_request, :organizer_for_user, user_id: registration[:user_id], competing: { 'status' => new_status })