diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index ddfe5c36b3..b9971a6106 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -298,20 +298,6 @@ Lint/ParenthesesAsGroupedExpression:
     - 'spec/lib/activitypub/activity/flag_spec.rb'
     - 'spec/models/import_spec.rb'
 
-# Offense count: 35
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: strict, consistent
-Lint/SymbolConversion:
-  Exclude:
-    - 'app/lib/translation_service/deepl.rb'
-    - 'app/services/backup_service.rb'
-    - 'spec/controllers/auth/registrations_controller_spec.rb'
-    - 'spec/controllers/auth/sessions_controller_spec.rb'
-    - 'spec/lib/activitypub/activity/announce_spec.rb'
-    - 'spec/lib/activitypub/activity/create_spec.rb'
-    - 'spec/services/activitypub/process_collection_service_spec.rb'
-
 # Offense count: 3
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: IgnoreEmptyBlocks, AllowUnusedKeywordArguments.
diff --git a/app/lib/translation_service/deepl.rb b/app/lib/translation_service/deepl.rb
index 537fd24c08..151d33d909 100644
--- a/app/lib/translation_service/deepl.rb
+++ b/app/lib/translation_service/deepl.rb
@@ -29,7 +29,7 @@ class TranslationService::DeepL < TranslationService
 
   def request(text, source_language, target_language)
     req = Request.new(:post, endpoint_url, form: { text: text, source_lang: source_language&.upcase, target_lang: target_language, tag_handling: 'html' })
-    req.add_headers('Authorization': "DeepL-Auth-Key #{@api_key}")
+    req.add_headers(Authorization: "DeepL-Auth-Key #{@api_key}")
     req
   end
 
diff --git a/app/services/backup_service.rb b/app/services/backup_service.rb
index 037f519d3e..b880dfbe71 100644
--- a/app/services/backup_service.rb
+++ b/app/services/backup_service.rb
@@ -23,7 +23,7 @@ class BackupService < BaseService
     account.statuses.with_includes.reorder(nil).find_in_batches do |statuses|
       statuses.each do |status|
         item = serialize_payload(ActivityPub::ActivityPresenter.from_status(status), ActivityPub::ActivitySerializer, signer: @account)
-        item.delete(:'@context')
+        item.delete(:@context)
 
         unless item[:type] == 'Announce' || item[:object][:attachment].blank?
           item[:object][:attachment].each do |attachment|
diff --git a/spec/controllers/auth/registrations_controller_spec.rb b/spec/controllers/auth/registrations_controller_spec.rb
index 0ebf6641fa..38c003b534 100644
--- a/spec/controllers/auth/registrations_controller_spec.rb
+++ b/spec/controllers/auth/registrations_controller_spec.rb
@@ -178,7 +178,7 @@ RSpec.describe Auth::RegistrationsController, type: :controller do
         Setting.registrations_mode = 'approved'
         request.headers["Accept-Language"] = accept_language
         invite = Fabricate(:invite, max_uses: nil, expires_at: 1.hour.ago)
-        post :create, params: { user: { account_attributes: { username: 'test' }, email: 'test@example.com', password: '12345678', password_confirmation: '12345678', 'invite_code': invite.code, agreement: 'true' } }
+        post :create, params: { user: { account_attributes: { username: 'test' }, email: 'test@example.com', password: '12345678', password_confirmation: '12345678', invite_code: invite.code, agreement: 'true' } }
       end
 
       it 'redirects to setup' do
@@ -210,7 +210,7 @@ RSpec.describe Auth::RegistrationsController, type: :controller do
         Setting.require_invite_text = true
         request.headers["Accept-Language"] = accept_language
         invite = Fabricate(:invite, user: inviter, max_uses: nil, expires_at: 1.hour.from_now)
-        post :create, params: { user: { account_attributes: { username: 'test' }, email: 'test@example.com', password: '12345678', password_confirmation: '12345678', 'invite_code': invite.code, agreement: 'true' } }
+        post :create, params: { user: { account_attributes: { username: 'test' }, email: 'test@example.com', password: '12345678', password_confirmation: '12345678', invite_code: invite.code, agreement: 'true' } }
       end
 
       it 'redirects to setup' do
diff --git a/spec/controllers/auth/sessions_controller_spec.rb b/spec/controllers/auth/sessions_controller_spec.rb
index 64433ddf45..8f898ad1f6 100644
--- a/spec/controllers/auth/sessions_controller_spec.rb
+++ b/spec/controllers/auth/sessions_controller_spec.rb
@@ -127,7 +127,7 @@ RSpec.describe Auth::SessionsController, type: :controller do
 
         before do
           allow_any_instance_of(ActionDispatch::Request).to receive(:remote_ip).and_return(current_ip)
-          allow(UserMailer).to receive(:suspicious_sign_in).and_return(double('email', 'deliver_later!': nil))
+          allow(UserMailer).to receive(:suspicious_sign_in).and_return(double('email', deliver_later!: nil))
           user.update(current_sign_in_at: 1.month.ago)
           post :create, params: { user: { email: user.email, password: user.password } }
         end
diff --git a/spec/lib/activitypub/activity/announce_spec.rb b/spec/lib/activitypub/activity/announce_spec.rb
index e9cd6c68c1..1b34853843 100644
--- a/spec/lib/activitypub/activity/announce_spec.rb
+++ b/spec/lib/activitypub/activity/announce_spec.rb
@@ -82,9 +82,9 @@ RSpec.describe ActivityPub::Activity::Announce do
             content: 'Lorem ipsum',
             attributedTo: 'https://example.com/actor',
             to: {
-              'type': 'OrderedCollection',
-              'id': 'http://example.com/followers',
-              'first': 'http://example.com/followers?page=true',
+              type: 'OrderedCollection',
+              id: 'http://example.com/followers',
+              first: 'http://example.com/followers?page=true',
             }
           }
         end
diff --git a/spec/lib/activitypub/activity/create_spec.rb b/spec/lib/activitypub/activity/create_spec.rb
index cd0f2df6e5..074aa54caa 100644
--- a/spec/lib/activitypub/activity/create_spec.rb
+++ b/spec/lib/activitypub/activity/create_spec.rb
@@ -252,9 +252,9 @@ RSpec.describe ActivityPub::Activity::Create do
             type: 'Note',
             content: 'Lorem ipsum',
             to: {
-              'type': 'OrderedCollection',
-              'id': 'http://example.com/followers',
-              'first': 'http://example.com/followers?page=true',
+              type: 'OrderedCollection',
+              id: 'http://example.com/followers',
+              first: 'http://example.com/followers?page=true',
             }
           }
         end
diff --git a/spec/services/activitypub/process_collection_service_spec.rb b/spec/services/activitypub/process_collection_service_spec.rb
index cb60e1cb8b..cb7deb6265 100644
--- a/spec/services/activitypub/process_collection_service_spec.rb
+++ b/spec/services/activitypub/process_collection_service_spec.rb
@@ -107,23 +107,23 @@ RSpec.describe ActivityPub::ProcessCollectionService, type: :service do
             '@context': [
               'https://www.w3.org/ns/activitystreams',
               nil,
-              { 'object': 'https://www.w3.org/ns/activitystreams#object' }
+              { object: 'https://www.w3.org/ns/activitystreams#object' }
             ],
-            'id': 'https://example.com/users/bob/fake-status/activity',
-            'type': 'Create',
-            'actor': 'https://example.com/users/bob',
-            'published': '2022-01-22T15:00:00Z',
-            'to': [
+            id: 'https://example.com/users/bob/fake-status/activity',
+            type: 'Create',
+            actor: 'https://example.com/users/bob',
+            published: '2022-01-22T15:00:00Z',
+            to: [
               'https://www.w3.org/ns/activitystreams#Public'
             ],
-            'cc': [
+            cc: [
               'https://example.com/users/bob/followers'
             ],
-            'signature': {
-              'type': 'RsaSignature2017',
-              'creator': 'https://example.com/users/bob#main-key',
-              'created': '2022-03-09T21:57:25Z',
-              'signatureValue': 'WculK0LelTQ0MvGwU9TPoq5pFzFfGYRDCJqjZ232/Udj4CHqDTGOSw5UTDLShqBOyycCkbZGrQwXG+dpyDpQLSe1UVPZ5TPQtc/9XtI57WlS2nMNpdvRuxGnnb2btPdesXZ7n3pCxo0zjaXrJMe0mqQh5QJO22mahb4bDwwmfTHgbD3nmkD+fBfGi+UV2qWwqr+jlV4L4JqNkh0gWljF5KTePLRRZCuWiQ/FAt7c67636cdIPf7fR+usjuZltTQyLZKEGuK8VUn2Gkfsx5qns7Vcjvlz1JqlAjyO8HPBbzTTHzUG2nUOIgC3PojCSWv6mNTmRGoLZzOscCAYQA6cKw=='
+            signature: {
+              type: 'RsaSignature2017',
+              creator: 'https://example.com/users/bob#main-key',
+              created: '2022-03-09T21:57:25Z',
+              signatureValue: 'WculK0LelTQ0MvGwU9TPoq5pFzFfGYRDCJqjZ232/Udj4CHqDTGOSw5UTDLShqBOyycCkbZGrQwXG+dpyDpQLSe1UVPZ5TPQtc/9XtI57WlS2nMNpdvRuxGnnb2btPdesXZ7n3pCxo0zjaXrJMe0mqQh5QJO22mahb4bDwwmfTHgbD3nmkD+fBfGi+UV2qWwqr+jlV4L4JqNkh0gWljF5KTePLRRZCuWiQ/FAt7c67636cdIPf7fR+usjuZltTQyLZKEGuK8VUn2Gkfsx5qns7Vcjvlz1JqlAjyO8HPBbzTTHzUG2nUOIgC3PojCSWv6mNTmRGoLZzOscCAYQA6cKw=='
             },
             '@id': 'https://example.com/users/bob/statuses/107928807471117876/activity',
             '@type': 'https://www.w3.org/ns/activitystreams#Create',
@@ -133,22 +133,22 @@ RSpec.describe ActivityPub::ProcessCollectionService, type: :service do
             'https://www.w3.org/ns/activitystreams#cc': {
               '@id': 'https://example.com/users/bob/followers'
             },
-            'object': {
-              'id': 'https://example.com/users/bob/fake-status',
-              'type': 'Note',
-              'published': '2022-01-22T15:00:00Z',
-              'url': 'https://www.youtube.com/watch?v=dQw4w9WgXcQ&feature=puck-was-here',
-              'attributedTo': 'https://example.com/users/bob',
-              'to': [
+            object: {
+              id: 'https://example.com/users/bob/fake-status',
+              type: 'Note',
+              published: '2022-01-22T15:00:00Z',
+              url: 'https://www.youtube.com/watch?v=dQw4w9WgXcQ&feature=puck-was-here',
+              attributedTo: 'https://example.com/users/bob',
+              to: [
                 'https://www.w3.org/ns/activitystreams#Public'
               ],
-              'cc': [
+              cc: [
                 'https://example.com/users/bob/followers'
               ],
-              'sensitive': false,
-              'atomUri': 'https://example.com/users/bob/fake-status',
-              'conversation': 'tag:example.com,2022-03-09:objectId=15:objectType=Conversation',
-              'content': '<p>puck was here</p>',
+              sensitive: false,
+              atomUri: 'https://example.com/users/bob/fake-status',
+              conversation: 'tag:example.com,2022-03-09:objectId=15:objectType=Conversation',
+              content: '<p>puck was here</p>',
 
               '@id': 'https://example.com/users/bob/statuses/107928807471117876',
               '@type': 'https://www.w3.org/ns/activitystreams#Note',