diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 3e5e246b9..ee4544cc6 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config --exclude-limit 20 --no-offense-counts --no-auto-gen-timestamp`
-# using RuboCop version 1.74.0.
+# using RuboCop version 1.75.2.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -289,8 +289,9 @@ Naming/MemoizedInstanceVariableName:
     - 'lib/redmine/field_format.rb'
     - 'lib/redmine/search.rb'
 
-# Configuration parameters: EnforcedStyle, AllowedPatterns.
+# Configuration parameters: EnforcedStyle, AllowedPatterns, ForbiddenIdentifiers, ForbiddenPatterns.
 # SupportedStyles: snake_case, camelCase
+# ForbiddenIdentifiers: __id__, __send__
 Naming/MethodName:
   Exclude:
     - 'lib/redmine/export/pdf.rb'
@@ -987,7 +988,7 @@ Style/NestedTernaryOperator:
     - 'app/models/journal.rb'
 
 # This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle, MinBodyLength.
+# Configuration parameters: EnforcedStyle, MinBodyLength, AllowConsecutiveConditionals.
 # SupportedStyles: skip_modifier_ifs, always
 Style/Next:
   Enabled: false
diff --git a/Gemfile b/Gemfile
index 9e2608e2a..df1d06f7e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -111,7 +111,7 @@ group :test do
   gem "capybara", ">= 3.39"
   gem 'selenium-webdriver', '>= 4.11.0'
   # RuboCop
-  gem 'rubocop', '~> 1.74.0', require: false
+  gem 'rubocop', '~> 1.75.2', require: false
   gem 'rubocop-performance', '~> 1.23.0', require: false
   gem 'rubocop-rails', '~> 2.29.0', require: false
   gem 'bundle-audit', require: false
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 9bb26bdec..aa12831e6 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1607,7 +1607,7 @@ module ApplicationHelper
 
   # Helper to render JSON in views
   def raw_json(arg)
-    arg.to_json.to_s.gsub('/', '\/').html_safe
+    arg.to_json.gsub('/', '\/').html_safe
   end
 
   def back_url_hidden_field_tag