diff --git a/.rubocop.yml b/.rubocop.yml
index 340703fbe..3ae91a0ce 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -2,7 +2,7 @@
 inherit_gem:
   rubocop-shopify: rubocop.yml
 
-require:
+plugins:
   - rubocop-minitest
   - rubocop-performance
   - rubocop-rake
diff --git a/Gemfile.lock b/Gemfile.lock
index 0dfd3b1a7..f1f3cb1ca 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -32,7 +32,7 @@ GEM
       mutex_m
       tzinfo (~> 2.0)
     ansi (1.5.0)
-    ast (2.4.2)
+    ast (2.4.3)
     base64 (0.1.1)
     bigdecimal (3.1.4)
     builder (3.2.4)
@@ -44,8 +44,10 @@ GEM
       ruby2_keywords
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
-    json (2.7.1)
-    language_server-protocol (3.17.0.3)
+    json (2.18.1)
+    language_server-protocol (3.17.0.5)
+    lint_roller (1.1.0)
+    logger (1.7.0)
     method_source (1.1.0)
     minitest (5.17.0)
     minitest-focus (1.3.1)
@@ -62,12 +64,12 @@ GEM
       racc (~> 1.4)
     nokogiri (1.18.9-x86_64-linux-gnu)
       racc (~> 1.4)
-    parallel (1.24.0)
-    parser (3.3.0.5)
+    parallel (1.27.0)
+    parser (3.3.10.2)
       ast (~> 2.4.1)
       racc
     phonelib (0.8.7)
-    prettier_print (1.2.0)
+    prism (1.9.0)
     pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -81,47 +83,52 @@ GEM
     rake (13.0.6)
     rake-compiler (1.2.1)
       rake
-    regexp_parser (2.9.0)
-    rexml (3.2.8)
-      strscan (>= 3.0.9)
-    rubocop (1.62.1)
+    rbs (3.10.3)
+      logger
+      tsort
+    regexp_parser (2.11.3)
+    rubocop (1.84.2)
       json (~> 2.3)
-      language_server-protocol (>= 3.17.0)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.1.0)
       parallel (~> 1.10)
       parser (>= 3.3.0.2)
       rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 1.8, < 3.0)
-      rexml (>= 3.2.5, < 4.0)
-      rubocop-ast (>= 1.31.1, < 2.0)
+      regexp_parser (>= 2.9.3, < 3.0)
+      rubocop-ast (>= 1.49.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 2.4.0, < 3.0)
-    rubocop-ast (1.31.2)
-      parser (>= 3.3.0.4)
-    rubocop-minitest (0.27.0)
-      rubocop (>= 0.90, < 2.0)
-    rubocop-performance (1.16.0)
-      rubocop (>= 1.7.0, < 2.0)
-      rubocop-ast (>= 0.4.0)
-    rubocop-rake (0.6.0)
-      rubocop (~> 1.0)
-    rubocop-shopify (2.12.0)
-      rubocop (~> 1.44)
-    ruby-lsp (0.3.8)
+      unicode-display_width (>= 2.4.0, < 4.0)
+    rubocop-ast (1.49.0)
+      parser (>= 3.3.7.2)
+      prism (~> 1.7)
+    rubocop-minitest (0.39.1)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.38.0, < 2.0)
+    rubocop-performance (1.26.1)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.47.1, < 2.0)
+    rubocop-rake (0.7.1)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.72.1)
+    rubocop-shopify (2.18.0)
+      rubocop (~> 1.62)
+    ruby-lsp (0.26.7)
       language_server-protocol (~> 3.17.0)
-      sorbet-runtime
-      syntax_tree (>= 5.0.0, < 6)
+      prism (>= 1.2, < 2.0)
+      rbs (>= 3, < 5)
     ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
-    sorbet-runtime (0.5.10648)
     stringio (3.1.0)
-    strscan (3.1.0)
-    syntax_tree (5.3.0)
-      prettier_print (>= 1.2.0)
     thor (1.2.1)
+    tsort (0.2.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    unicode-display_width (2.5.0)
+    unicode-display_width (3.2.0)
+      unicode-emoji (~> 4.1)
+    unicode-emoji (4.2.0)
 
 PLATFORMS
   arm64-darwin-21
diff --git a/lib/worldwide/address.rb b/lib/worldwide/address.rb
index b20002138..27421bebd 100644
--- a/lib/worldwide/address.rb
+++ b/lib/worldwide/address.rb
@@ -290,7 +290,7 @@ def build_address_format_array(additional_lines:, excluded_fields:)
         result << line unless blank?(line.join)
       end
 
-      result + additional_lines.map { |x| [x] }
+      result + additional_lines.zip
     end
 
     # Returns a hash containing the values for each address field
@@ -348,7 +348,7 @@ def fill_in_fields(fields:, address_data:)
     def japan_with_non_japanese_script?
       text = build_formatted_address_data.values.join
 
-      country_code == "JP" && Worldwide::Scripts.identify(text: text).intersection(JAPANESE_SCRIPTS).empty?
+      country_code == "JP" && !Worldwide::Scripts.identify(text: text).intersect?(JAPANESE_SCRIPTS)
     end
 
     def normalize_city
@@ -457,7 +457,7 @@ def strip_extra_chars(lines:, excluded_fields:)
     #   - `〒` ("yuubin" mark) is a prefix that's prepended to the postal code (zip)
     # If the associated field is excluded/empty, we need to suppress the associated special character.
     def strip_extra_japanese_chars(line:, excluded_fields:)
-      return nil if line.nil?
+      return if line.nil?
 
       line.map do |field|
         stripped = field
diff --git a/lib/worldwide/address_validator.rb b/lib/worldwide/address_validator.rb
index 7ac16699a..c9dcd801e 100644
--- a/lib/worldwide/address_validator.rb
+++ b/lib/worldwide/address_validator.rb
@@ -9,6 +9,7 @@ class AddressValidator
 
     class << self
       extend Forwardable
+
       def_delegators :instance, :errors, :valid?
     end
 
diff --git a/lib/worldwide/cldr/date_format_pattern.rb b/lib/worldwide/cldr/date_format_pattern.rb
index 47213fe76..aed3d9914 100644
--- a/lib/worldwide/cldr/date_format_pattern.rb
+++ b/lib/worldwide/cldr/date_format_pattern.rb
@@ -50,28 +50,28 @@ def tokenize(format)
         UNQUOTED_LITERAL = /[^a-zA-Z']+/
 
         def parse_field(format)
-          return nil unless format.start_with?(PATTERN_FIELD)
+          return unless format.start_with?(PATTERN_FIELD)
 
           match = PATTERN_FIELD.match(format)
           [Field.from(match[0]), match.end(0)]
         end
 
         def parse_single_quote(format)
-          return nil unless format.start_with?(SINGLE_QUOTE_LITERAL)
+          return unless format.start_with?(SINGLE_QUOTE_LITERAL)
 
           match = SINGLE_QUOTE_LITERAL.match(format)
           [Literal.new("'"), match.end(0)]
         end
 
         def parse_quoted_literal(format)
-          return nil unless format.start_with?(QUOTED_LITERAL)
+          return unless format.start_with?(QUOTED_LITERAL)
 
           match = QUOTED_LITERAL.match(format)
           [Literal.new(match[1].gsub(SINGLE_QUOTE_LITERAL, "'")), match.end(0)]
         end
 
         def parse_unquoted_literal(format)
-          return nil unless format.start_with?(UNQUOTED_LITERAL)
+          return unless format.start_with?(UNQUOTED_LITERAL)
 
           match = UNQUOTED_LITERAL.match(format)
           [Literal.new(match[0]), match.end(0)]
diff --git a/lib/worldwide/cldr/fallbacks.rb b/lib/worldwide/cldr/fallbacks.rb
index dbcecf435..69a7010ac 100644
--- a/lib/worldwide/cldr/fallbacks.rb
+++ b/lib/worldwide/cldr/fallbacks.rb
@@ -38,7 +38,7 @@ def ancestry(locale)
         loop do
           if cldr_defined_parents[ancestors.last]
             ancestors << cldr_defined_parents[ancestors.last]
-          elsif I18n::Locale::Tag.tag(ancestors.last).parents.count > 0
+          elsif I18n::Locale::Tag.tag(ancestors.last).parents.any?
             ancestors << I18n::Locale::Tag.tag(ancestors.last).parents.first.to_sym
           else
             break
diff --git a/lib/worldwide/config.rb b/lib/worldwide/config.rb
index 83c00f631..243fda379 100644
--- a/lib/worldwide/config.rb
+++ b/lib/worldwide/config.rb
@@ -70,7 +70,7 @@ def i18n_defined?(i18n_config, key)
           # we don't want to trigger the backend resolution until after we've determined whether they have set it explicitly.
           class_variable = "@@#{key}".to_sym
           instance_variable = "@#{key}".to_sym
-          i18n_config.class.class_variables.include?(class_variable) || i18n_config.instance_variables.include?(instance_variable)
+          i18n_config.class.class_variable_defined?(class_variable) || i18n_config.instance_variables.include?(instance_variable)
         else
           i18n_config.key?(key)
         end
diff --git a/lib/worldwide/currency.rb b/lib/worldwide/currency.rb
index ad46d81d9..50a6cbe2e 100644
--- a/lib/worldwide/currency.rb
+++ b/lib/worldwide/currency.rb
@@ -117,7 +117,7 @@ def symbol(locale: I18n.locale)
       raw_symbol = Worldwide::Cldr.t("currencies.#{@currency_code}.narrow_symbol", default: nil, locale: locale) ||
         Worldwide::Cldr.t("currencies.#{@currency_code}.symbol", default: nil, locale: locale)
 
-      return nil if raw_symbol.nil?
+      return if raw_symbol.nil?
 
       # For some locales (e.g., HK), in-market folks have requested that we leave the CLDR behaviour untouched
       exceptional_symbol = EXCEPTIONS.fetch(@currency_code.to_sym, nil)
@@ -154,7 +154,7 @@ def name
     private
 
     def combine(amount:, decimal_places:, humanize:, locale:, symbol:)
-      space = if has_space(locale)
+      space = if has_space?(locale)
         # This is U+00A0, the Unicode non-breaking space character
         [160].pack("U*")
       else
@@ -237,7 +237,7 @@ def has_minor_symbol?
     end
 
     # Returns true if there should be a space between the amount and the currency symbol
-    def has_space(locale)
+    def has_space?(locale)
       pattern = Worldwide::Cldr.t("numbers.latn.formats.currency.patterns.default.standard", locale: locale)
 
       # Note that CLDR uses these characters in its currency formats:
@@ -250,7 +250,7 @@ def has_space(locale)
     def minor_symbol
       key = @currency_code
 
-      return nil unless Currency.minor_symbols.key?(key)
+      return unless Currency.minor_symbols.key?(key)
 
       Currency.minor_symbols[key]["symbol"]
     end
diff --git a/lib/worldwide/extant_outcodes.rb b/lib/worldwide/extant_outcodes.rb
index 274d255f1..38dbf28d6 100644
--- a/lib/worldwide/extant_outcodes.rb
+++ b/lib/worldwide/extant_outcodes.rb
@@ -10,6 +10,7 @@ class ExtantOutcodes
 
     class << self
       extend Forwardable
+
       def_delegators :instance, :for_country
     end
 
diff --git a/lib/worldwide/fields.rb b/lib/worldwide/fields.rb
index 857af5eb0..f30c0db78 100644
--- a/lib/worldwide/fields.rb
+++ b/lib/worldwide/fields.rb
@@ -12,6 +12,7 @@ class Fields
 
     class << self
       extend Forwardable
+
       def_delegators :instance, :field
     end
 
diff --git a/lib/worldwide/lists.rb b/lib/worldwide/lists.rb
index 22b87ec68..e72a80523 100644
--- a/lib/worldwide/lists.rb
+++ b/lib/worldwide/lists.rb
@@ -3,6 +3,7 @@
 module Worldwide
   module Lists
     extend self
+
     # We assume that the data is expected to returned in the same
     # order as it is received. We are aware of one counter example,
     # Urdu, that we do not support.
diff --git a/lib/worldwide/locale.rb b/lib/worldwide/locale.rb
index 4679e9c54..7838187ed 100644
--- a/lib/worldwide/locale.rb
+++ b/lib/worldwide/locale.rb
@@ -71,7 +71,7 @@ def name(locale: I18n.locale, context: :middle_of_sentence, throw: true)
       if @name_cache[context].is_a?(I18n::MissingTranslation)
         raise @name_cache[context] if throw
 
-        return nil
+        return
       end
 
       @name_cache[context]
@@ -93,7 +93,7 @@ def endonym(context: :middle_of_sentence, throw: true)
       if @endonym.is_a?(I18n::MissingTranslation)
         raise @endonym if throw
 
-        return nil
+        return
       end
 
       @endonym
@@ -113,7 +113,7 @@ def exonym(target_locale:, context:)
         result = lookup(language, locale: target_locale)
         if result
           transformed = Worldwide::Cldr::ContextTransforms.transform(result, :languages, context, locale: target_locale)
-          break "#{transformed}#{i > 0 ? territories_suffix(code.to_s) : ""}"
+          break "#{transformed}#{territories_suffix(code.to_s) if i > 0}"
         end
       end
     end
diff --git a/lib/worldwide/region.rb b/lib/worldwide/region.rb
index 3eaedf806..8b3faa715 100644
--- a/lib/worldwide/region.rb
+++ b/lib/worldwide/region.rb
@@ -375,7 +375,7 @@ def deprecated?
     # An Worldwide::Field that can be used to ask about the field, including
     # labels, error messages, and an autofill value if there is one.
     def field(key:)
-      return nil unless country?
+      return unless country?
 
       Worldwide::Fields.field(country_code: iso_code, field_key: key)
     end
@@ -479,7 +479,7 @@ def zip_required?
     #
     # @return [String, nil] One of "ALPHANUMERIC", "NUMERIC", "NUMERIC_AND_PUNCTUATION", or nil if no zip_example
     def zip_type
-      return nil if zip_example.nil?
+      return if zip_example.nil?
 
       if zip_example.match?(/[A-Za-z]/)
         FORMAT_TYPES[:ALPHANUMERIC]
@@ -554,7 +554,7 @@ def additional_field_required?(field_name)
       field ? !!field["required"] : false
     end
 
-    def answers_to_cldr_code(search_code)
+    def answers_to_cldr_code?(search_code)
       return false if Util.blank?(search_code) || Util.blank?(cldr_code)
       return true if search_code.casecmp(cldr_code).zero?
 
@@ -562,7 +562,7 @@ def answers_to_cldr_code(search_code)
       "#{pc&.cldr_code&.downcase}#{cldr_code.downcase}" == search_code.downcase
     end
 
-    def answers_to_iso_code(search_code)
+    def answers_to_iso_code?(search_code)
       return true if search_code == iso_code
 
       pc = parent_country
@@ -616,9 +616,9 @@ def passes_country_zip_regexp?(value:, partial_match: false)
     #
     # Returns the Region in which the zip belongs based on the prefix, or `nil` if no match is found.
     def search_prefixes_by_normalized_zip(prefixes:, zip:, allow_partial_zip: false)
-      return nil if Worldwide::Util.blank?(prefixes)
-      return nil if Worldwide::Util.blank?(zip)
-      return nil unless allow_partial_zip || passes_country_zip_regexp?(value: zip)
+      return if Worldwide::Util.blank?(prefixes)
+      return if Worldwide::Util.blank?(zip)
+      return unless allow_partial_zip || passes_country_zip_regexp?(value: zip)
 
       stripped = Zip.strip_optional_country_prefix(country_code: iso_code, zip: zip)
 
diff --git a/lib/worldwide/regions.rb b/lib/worldwide/regions.rb
index 0706849d3..119e59e07 100644
--- a/lib/worldwide/regions.rb
+++ b/lib/worldwide/regions.rb
@@ -12,6 +12,7 @@ class Regions
 
     class << self
       extend Forwardable
+
       def_delegators :instance, :all, :region_by_cldr_code, :region
     end
 
diff --git a/lib/worldwide/regions_loader.rb b/lib/worldwide/regions_loader.rb
index 4f4c01e47..f67c4d108 100644
--- a/lib/worldwide/regions_loader.rb
+++ b/lib/worldwide/regions_loader.rb
@@ -225,8 +225,6 @@ def load_territory(filename)
       spec = YAML.safe_load_file(filename)
       code = spec["code"]
 
-      loaded_regions = []
-
       region = Region.new(
         alpha_three: country_codes.dig(code, "alpha3"),
         continent: false,
diff --git a/lib/worldwide/zip.rb b/lib/worldwide/zip.rb
index 801047da4..dbb76a375 100644
--- a/lib/worldwide/zip.rb
+++ b/lib/worldwide/zip.rb
@@ -50,7 +50,7 @@ def gb_style?(country_code:)
     # @param min_confidence [Integer] The minimum confidence level (between 0-100) that is accepted from a suggestion (optional)
     # @return [Region] which is a "country" if we have a suggestion, or `nil` if we do not.
     def find_country(country_code: nil, zip:, min_confidence: 0)
-      return nil unless Util.present?(zip)
+      return unless Util.present?(zip)
 
       country = Worldwide.region(code: country_code) unless country_code.nil?
       return country if country&.valid_zip?(zip)
@@ -62,7 +62,7 @@ def find_country(country_code: nil, zip:, min_confidence: 0)
       return suggestion unless suggestion.nil? || confidence.nil? || confidence < min_confidence
 
       # If our postal code is wholly numeric, we can't make an intelligent suggestion without an alleged country.
-      return nil unless adjusted_zip.match?(/[A-Z]/)
+      return unless adjusted_zip.match?(/[A-Z]/)
 
       # Try a broader-ranging match without considering the alleged country
       # We'll see if we have only a single suggestion and, if so, return it.
@@ -95,7 +95,7 @@ def normalize(country_code:, zip:, allow_autofill: true, strip_extraneous_charac
         return autofill if Util.present?(autofill)
       end
 
-      return nil if zip.nil?
+      return if zip.nil?
 
       # Convert to uppercase
       # Convert numeric and romaji full-width to half-width
diff --git a/rake/cldr/cleaner.rb b/rake/cldr/cleaner.rb
index 4ac56b7c7..b942fba54 100644
--- a/rake/cldr/cleaner.rb
+++ b/rake/cldr/cleaner.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 
 require "fileutils"
 require "worldwide/paths"
diff --git a/rake/cldr/flatten_hash.rb b/rake/cldr/flatten_hash.rb
index 56d263949..2fdf85ca6 100644
--- a/rake/cldr/flatten_hash.rb
+++ b/rake/cldr/flatten_hash.rb
@@ -1,7 +1,8 @@
 # frozen_string_literal: true
 
 module FlattenHash
-  NotHashError = Class.new(StandardError)
+  class NotHashError < StandardError
+  end
 
   class << self
     def run(hash, output = {}, parent_key = [])
diff --git a/rake/cldr/locale_generator.rb b/rake/cldr/locale_generator.rb
index b1746a14b..744f5b80b 100644
--- a/rake/cldr/locale_generator.rb
+++ b/rake/cldr/locale_generator.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 
 require "fileutils"
 require "worldwide"
@@ -1001,7 +1001,7 @@ def ordinal_pluralization_keys
           # END OF AUTO-GENERATED CONTENT
         CONTENTS
 
-        contents = contents.split("\n").map { |line| "#{line.strip.empty? ? "" : indentation_of_starting_line}#{line}" }.join("\n")
+        contents = contents.split("\n").map { |line| "#{indentation_of_starting_line unless line.strip.empty?}#{line}" }.join("\n")
 
         new_file_contents = existing_file_contents[0...start_of_auto_generated_content.begin(0)] + contents + existing_file_contents[end_of_auto_generated_content.end(0)..]
 
diff --git a/rake/cldr/patch.rb b/rake/cldr/patch.rb
index 9ce5dcc0a..34c6d61b5 100644
--- a/rake/cldr/patch.rb
+++ b/rake/cldr/patch.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 
 require "i18n"
 require "parser/current"
@@ -1357,7 +1357,7 @@ def patch_file(locale, file_name, key_path, existing_value, value, **options) #
           patch_yaml_file(file_path, [locale, *key_path], existing_value, value, **options)
         end
 
-        def patch_units_file(file_path, paths_to_keep)
+        def patch_units_file(file_path, paths_to_keep) # rubocop:disable Naming/PredicateMethod
           return false unless File.exist?(file_path)
 
           source_content = File.read(file_path)
diff --git a/rake/cldr/puller.rb b/rake/cldr/puller.rb
index 1653f4cb2..8ac1bf281 100644
--- a/rake/cldr/puller.rb
+++ b/rake/cldr/puller.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 
 require "cldr/download"
 require "cldr/draft_status"
diff --git a/rake/cldr/sort_yaml.rb b/rake/cldr/sort_yaml.rb
index f72b791c6..834b0705c 100644
--- a/rake/cldr/sort_yaml.rb
+++ b/rake/cldr/sort_yaml.rb
@@ -13,7 +13,7 @@ def sort(data)
       UnflattenHash.run(sorted)
     end
 
-    def sort_file(filename, output_filename: nil)
+    def sort_file(filename, output_filename: nil) # rubocop:disable Naming/PredicateMethod
       output_filename ||= begin
         extension = File.extname(filename)
         File.join(File.dirname(filename), "#{File.basename(filename, extension)}_sorted#{extension}")
diff --git a/rake/cldr/unflatten_hash.rb b/rake/cldr/unflatten_hash.rb
index 98944f591..17330e9bb 100644
--- a/rake/cldr/unflatten_hash.rb
+++ b/rake/cldr/unflatten_hash.rb
@@ -1,7 +1,8 @@
 # frozen_string_literal: true
 
 module UnflattenHash
-  NotHashError = Class.new(StandardError)
+  class NotHashError < StandardError
+  end
 
   class << self
     def run(hash)
diff --git a/rake/tasks/cldr.rake b/rake/tasks/cldr.rake
index f1b7f0c94..c98df5e55 100644
--- a/rake/tasks/cldr.rake
+++ b/rake/tasks/cldr.rake
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 
 require "worldwide/util"
 
diff --git a/test/worldwide/currencies_test.rb b/test/worldwide/currencies_test.rb
index 47a41fc67..e35c369ee 100644
--- a/test/worldwide/currencies_test.rb
+++ b/test/worldwide/currencies_test.rb
@@ -10,13 +10,13 @@ class CurrenciesTest < ActiveSupport::TestCase
       refute_empty currencies
 
       currencies.each do |currency|
-        assert currency.is_a?(Worldwide::Currency)
+        assert_kind_of Worldwide::Currency, currency
       end
     end
 
     test ".each should allow currencies to be enumerable" do
       Worldwide::Currencies.each do |currency|
-        assert currency.is_a?(Worldwide::Currency)
+        assert_kind_of Worldwide::Currency, currency
       end
     end
 
diff --git a/test/worldwide/field_data_consistency_test.rb b/test/worldwide/field_data_consistency_test.rb
index cf06041ec..4d7242f31 100644
--- a/test/worldwide/field_data_consistency_test.rb
+++ b/test/worldwide/field_data_consistency_test.rb
@@ -43,7 +43,7 @@ class FieldDataConsistencyTest < ActiveSupport::TestCase
 
           assert(
             differ_only_in_contents_of_parens(value, optional_labels[optional_key]) ||
-            differ_only_in_optionality(value, optional_labels[optional_key]),
+            differ_only_in_optionality?(value, optional_labels[optional_key]),
             "Expected that the label for `#{key[-3]}` and its optional version in `#{file_path}` would only differ by the contents of the parentheses. Instead found:\n\t default: #{value}\n\toptional: #{optional_labels[optional_key]}",
           )
         end
@@ -77,7 +77,7 @@ def differ_only_in_contents_of_parens(default, optional)
     # For one label, our Korean translator has opted for a phrasing that already has paretheses in the core text.
     # This means that the (optional) phrasing shares the same parentheses, after a comma.
     # In order to avoid failing the test on that label, we need to explicitly search for ", optional" in Korean.
-    def differ_only_in_optionality(default, optional)
+    def differ_only_in_optionality?(default, optional)
       default == optional.gsub(/, 선택 사항/, "")
     end
 
diff --git a/test/worldwide/region_data_consistency_test.rb b/test/worldwide/region_data_consistency_test.rb
index 2422543c9..30e6453df 100644
--- a/test/worldwide/region_data_consistency_test.rb
+++ b/test/worldwide/region_data_consistency_test.rb
@@ -173,7 +173,7 @@ class RegionDataConsistencyTest < ActiveSupport::TestCase
       Regions.all.select(&:country?).each do |country|
         country_tags = country.tags&.to_set
         next if country_tags.nil?
-        next if eu_tags.intersection(country_tags).empty?
+        next unless eu_tags.intersect?(country_tags)
 
         assert_includes eu.zones.map(&:iso_code), country.iso_code
       end