diff --git a/.rubocop.yml b/.rubocop.yml
index 3a11f7000..25e0fa940 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -28,6 +28,10 @@ Layout/EmptyLineAfterMagicComment:
 Layout/SpaceInsideHashLiteralBraces:
   EnforcedStyle: space
 
+Lint/UselessAccessModifier:
+  ContextCreatingMethods:
+    - class_methods
+
 Metrics/AbcSize:
   Max: 100
 
diff --git a/app/controllers/auth/sessions_controller.rb b/app/controllers/auth/sessions_controller.rb
index 2415e2ef3..1fd755334 100644
--- a/app/controllers/auth/sessions_controller.rb
+++ b/app/controllers/auth/sessions_controller.rb
@@ -46,6 +46,7 @@ class Auth::SessionsController < Devise::SessionsController
       user   = User.authenticate_with_ldap(user_params) if Devise.ldap_authentication
       user ||= User.authenticate_with_pam(user_params) if Devise.pam_authentication
       user ||= User.find_for_authentication(email: user_params[:email])
+      user
     end
   end
 
diff --git a/app/controllers/tags_controller.rb b/app/controllers/tags_controller.rb
index 234a0c411..6426a7d69 100644
--- a/app/controllers/tags_controller.rb
+++ b/app/controllers/tags_controller.rb
@@ -27,7 +27,7 @@ class TagsController < ApplicationController
         expires_in 0, public: true
 
         limit     = params[:limit].present? ? [params[:limit].to_i, PAGE_SIZE_MAX].min : PAGE_SIZE
-        @statuses = HashtagQueryService.new.call(@tag, filter_params, nil, @local).limit(PAGE_SIZE)
+        @statuses = HashtagQueryService.new.call(@tag, filter_params, nil, @local).limit(limit)
         @statuses = cache_collection(@statuses, Status)
 
         render xml: RSS::TagSerializer.render(@tag, @statuses)
diff --git a/app/lib/activitypub/activity/create.rb b/app/lib/activitypub/activity/create.rb
index d3d460551..e81452e3c 100644
--- a/app/lib/activitypub/activity/create.rb
+++ b/app/lib/activitypub/activity/create.rb
@@ -45,7 +45,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
 
     RedisLock.acquire(lock_options) do |lock|
       if lock.acquired?
-        return if delete_arrived_first?(object_uri) || poll_vote?
+        return if delete_arrived_first?(object_uri) || poll_vote? # rubocop:disable Lint/NonLocalExitFromIterator
 
         @status = find_existing_status
 
diff --git a/app/lib/proof_provider/keybase/config_serializer.rb b/app/lib/proof_provider/keybase/config_serializer.rb
index fbce7aeee..c6c364d31 100644
--- a/app/lib/proof_provider/keybase/config_serializer.rb
+++ b/app/lib/proof_provider/keybase/config_serializer.rb
@@ -55,7 +55,7 @@ class ProofProvider::Keybase::ConfigSerializer < ActiveModel::Serializer
   end
 
   def profile_url
-    CGI.unescape(short_account_url('%{username}')) # rubocop:disable Style/FormatStringToken
+    CGI.unescape(short_account_url('%{username}'))
   end
 
   def check_url
diff --git a/app/lib/request.rb b/app/lib/request.rb
index 247c32958..bcba1eebf 100644
--- a/app/lib/request.rb
+++ b/app/lib/request.rb
@@ -231,6 +231,7 @@ class Request
             begin
               sock.connect_nonblock(addr_by_socket[sock])
             rescue Errno::EISCONN
+              # Do nothing
             rescue => e
               sock.close
               outer_e = e
diff --git a/app/lib/settings/scoped_settings.rb b/app/lib/settings/scoped_settings.rb
index 9ca39510a..3bec9bd56 100644
--- a/app/lib/settings/scoped_settings.rb
+++ b/app/lib/settings/scoped_settings.rb
@@ -11,7 +11,7 @@ module Settings
       @object = object
     end
 
-    # rubocop:disable Style/MethodMissing
+    # rubocop:disable Style/MethodMissingSuper
     def method_missing(method, *args)
       method_name = method.to_s
       # set a value for a variable
@@ -24,7 +24,7 @@ module Settings
         self[method_name]
       end
     end
-    # rubocop:enable Style/MethodMissing
+    # rubocop:enable Style/MethodMissingSuper
 
     def respond_to_missing?(*)
       true
@@ -48,7 +48,6 @@ module Settings
       record.update!(value: value)
 
       Rails.cache.write(Setting.cache_key(key, @object), value)
-      value
     end
 
     def [](key)
diff --git a/app/models/concerns/omniauthable.rb b/app/models/concerns/omniauthable.rb
index 736da6c1d..4ea219537 100644
--- a/app/models/concerns/omniauthable.rb
+++ b/app/models/concerns/omniauthable.rb
@@ -57,7 +57,7 @@ module Omniauthable
 
       user = User.new(user_params_from_auth(email, auth))
 
-      user.account.avatar_remote_url = auth.info.image if auth.info.image =~ /\A#{URI.regexp(%w(http https))}\z/
+      user.account.avatar_remote_url = auth.info.image if auth.info.image =~ /\A#{URI::DEFAULT_PARSER.make_regexp(%w(http https))}\z/
       user.skip_confirmation!
       user.save!
       user