diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 847a0f74aa24897c097eb7a4fd0c664ec50bad83..f2ba9fdb17414d76fe2295d7faeb9c270ab525e7 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -686,17 +686,6 @@ Style/TrailingUnderscoreVariable:
     - 'spec/lib/gitlab/etag_caching/middleware_spec.rb'
     - 'spec/services/quick_actions/interpret_service_spec.rb'
 
-# Offense count: 5
-# Cop supports --auto-correct.
-# Configuration parameters: ExactNameMatch, AllowPredicates, AllowDSLWriters, IgnoreClassMethods, Whitelist.
-# Whitelist: to_ary, to_a, to_c, to_enum, to_h, to_hash, to_i, to_int, to_io, to_open, to_path, to_proc, to_r, to_regexp, to_str, to_s, to_sym
-Style/TrivialAccessors:
-  Exclude:
-    - 'app/models/external_issue.rb'
-    - 'app/serializers/base_serializer.rb'
-    - 'lib/gitlab/auth/ldap/person.rb'
-    - 'lib/system_check/base_check.rb'
-
 # Offense count: 4
 # Cop supports --auto-correct.
 Style/UnlessElse:
diff --git a/app/models/external_issue.rb b/app/models/external_issue.rb
index 4f73beaafc5ba76db1668f1be7adff72e638ab33..68b2353556e32b7a43420fa65721c0041a167e58 100644
--- a/app/models/external_issue.rb
+++ b/app/models/external_issue.rb
@@ -3,6 +3,8 @@
 class ExternalIssue
   include Referable
 
+  attr_reader :project
+
   def initialize(issue_identifier, project)
     @issue_identifier, @project = issue_identifier, project
   end
@@ -32,12 +34,8 @@ class ExternalIssue
     [self.class, to_s].hash
   end
 
-  def project
-    @project
-  end
-
   def project_id
-    @project.id
+    project.id
   end
 
   def to_reference(_from = nil, full: nil)
diff --git a/app/serializers/base_serializer.rb b/app/serializers/base_serializer.rb
index 7b65bd22f54a95c7811b6fc6de483815c1aa5cc0..4744a7c1cc859cc065c8085aaf83ad28922578a7 100644
--- a/app/serializers/base_serializer.rb
+++ b/app/serializers/base_serializer.rb
@@ -16,11 +16,11 @@ class BaseSerializer
       .as_json
   end
 
-  def self.entity(entity_class)
-    @entity_class ||= entity_class
-  end
+  class << self
+    attr_reader :entity_class
 
-  def self.entity_class
-    @entity_class
+    def entity(entity_class)
+      @entity_class ||= entity_class
+    end
   end
 end
diff --git a/lib/gitlab/auth/ldap/person.rb b/lib/gitlab/auth/ldap/person.rb
index a0244a3cea15f85eaada298a2acfbaf2280c0aaf..48d134f91b0e37aaea483c28d37c86cfaedf65b8 100644
--- a/lib/gitlab/auth/ldap/person.rb
+++ b/lib/gitlab/auth/ldap/person.rb
@@ -98,9 +98,7 @@ module Gitlab
 
         private
 
-        def entry
-          @entry
-        end
+        attr_reader :entry
 
         def config
           @config ||= Gitlab::Auth::LDAP::Config.new(provider)
diff --git a/lib/system_check/base_check.rb b/lib/system_check/base_check.rb
index e06245294c4287c890522df94a3b2346e685cb2f..46aad8aa8853a5bbbf55f11a04d136c82ef14ddf 100644
--- a/lib/system_check/base_check.rb
+++ b/lib/system_check/base_check.rb
@@ -70,18 +70,14 @@ module SystemCheck
     # multiple reasons why a check can fail
     #
     # @param [String] reason to be displayed
-    def skip_reason=(reason)
-      @skip_reason = reason
-    end
+    attr_writer :skip_reason
 
     # Skip reason defined during runtime
     #
     # This value have precedence over the one defined in the subclass
     #
     # @return [String] the reason
-    def skip_reason
-      @skip_reason
-    end
+    attr_reader :skip_reason
 
     # Does the check support automatically repair routine?
     #