diff --git a/app/controllers/user/registrations_controller.rb b/app/controllers/user/registrations_controller.rb
index fa900ea1..0413dcd4 100644
--- a/app/controllers/user/registrations_controller.rb
+++ b/app/controllers/user/registrations_controller.rb
@@ -8,8 +8,8 @@ class User::RegistrationsController < Devise::RegistrationsController
   end
 
   def destroy
-    DeletionWorker.perform_async(resource.id)
     Devise.sign_out_all_scopes ? sign_out : sign_out(resource_name)
+    resource.destroy
     set_flash_message :notice, :destroyed if is_flashing_format?
     yield resource if block_given?
     respond_with_navigational(resource){ redirect_to after_sign_out_path_for(resource_name) }
diff --git a/app/models/user.rb b/app/models/user.rb
index 3c8e9b18..f9449888 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -27,28 +27,28 @@ class User < ApplicationRecord
 
 #   attr_accessor :login
 
-  has_many :questions, dependent: :destroy
-  has_many :answers, dependent: :destroy
-  has_many :comments, dependent: :destroy
-  has_many :inboxes, dependent: :destroy
-  has_many :smiles, class_name: "Appendable::Reaction", dependent: :destroy
-  has_many :services, dependent: :destroy
-  has_many :notifications, foreign_key: :recipient_id, dependent: :destroy
-  has_many :reports, dependent: :destroy
-  has_many :moderation_comments, dependent: :destroy
-  has_many :moderation_votes, dependent: :destroy
-  has_many :lists, dependent: :destroy
-  has_many :list_memberships, class_name: "ListMember", foreign_key: 'user_id', dependent: :destroy
-  has_many :mute_rules, dependent: :destroy
-  has_many :anonymous_blocks, dependent: :destroy
+  has_many :questions, dependent: :destroy_async
+  has_many :answers, dependent: :destroy_async
+  has_many :comments, dependent: :destroy_async
+  has_many :inboxes, dependent: :destroy_async
+  has_many :smiles, class_name: "Appendable::Reaction", dependent: :destroy_async
+  has_many :services, dependent: :destroy_async
+  has_many :notifications, foreign_key: :recipient_id, dependent: :destroy_async
+  has_many :reports, dependent: :destroy_async
+  has_many :moderation_comments, dependent: :destroy_async
+  has_many :moderation_votes, dependent: :destroy_async
+  has_many :lists, dependent: :destroy_async
+  has_many :list_memberships, class_name: "ListMember", foreign_key: 'user_id', dependent: :destroy_async
+  has_many :mute_rules, dependent: :destroy_async
+  has_many :anonymous_blocks, dependent: :destroy_async
 
-  has_many :subscriptions, dependent: :destroy
-  has_many :totp_recovery_codes, dependent: :destroy
+  has_many :subscriptions, dependent: :destroy_async
+  has_many :totp_recovery_codes, dependent: :destroy_async
 
-  has_one :profile, dependent: :destroy
-  has_one :theme, dependent: :destroy
+  has_one :profile, dependent: :destroy_async
+  has_one :theme, dependent: :destroy_async
 
-  has_many :bans, class_name: 'UserBan', dependent: :destroy
+  has_many :bans, class_name: 'UserBan', dependent: :destroy_async
   has_many :banned_users, class_name: 'UserBan',
                           foreign_key: 'banned_by_id',
                           dependent: :nullify
diff --git a/app/workers/deletion_worker.rb b/app/workers/deletion_worker.rb
deleted file mode 100644
index 142c0a1c..00000000
--- a/app/workers/deletion_worker.rb
+++ /dev/null
@@ -1,15 +0,0 @@
-class DeletionWorker
-  include Sidekiq::Worker
-
-  sidekiq_options queue: :deletion, retry: false
-
-  # @param resource_id [Integer] user id passed from Devise
-  def perform(resource_id)
-    begin
-      User.find(resource_id).destroy!
-    rescue => e
-      logger.info "failed to delete user: #{e.message}"
-      Sentry.capture_exception(e)
-    end
-  end
-end
diff --git a/config/sidekiq.yml b/config/sidekiq.yml
index fd4423fd..2236bdc5 100644
--- a/config/sidekiq.yml
+++ b/config/sidekiq.yml
@@ -6,10 +6,10 @@ staging:
 production:
   :concurrency: 25
 :queues:
+  - default
   - share
   - carrierwave
   - mailers
-  - deletion
   - question
   - export