diff --git a/Gemfile.lock b/Gemfile.lock
index f9f03e1ee8..2c39c520a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -641,9 +641,9 @@ GEM
       rubocop-rails (= 2.23.0)
       rubocop-rake (= 0.6.0)
       rubocop-rspec (= 2.25.0)
-    rubocop-performance (1.19.1)
-      rubocop (>= 1.7.0, < 2.0)
-      rubocop-ast (>= 0.4.0)
+    rubocop-performance (1.20.1)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
     rubocop-rails (2.23.0)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
diff --git a/app/controllers/admin/legal_aid_applications/submissions_controller.rb b/app/controllers/admin/legal_aid_applications/submissions_controller.rb
index 3c728f19c3..cb1fc754d4 100644
--- a/app/controllers/admin/legal_aid_applications/submissions_controller.rb
+++ b/app/controllers/admin/legal_aid_applications/submissions_controller.rb
@@ -55,7 +55,7 @@ def download_data(attribute)
 
       # :nocov:
       def download_report(attribute)
-        report = legal_aid_application.send("#{attribute}_report")
+        report = legal_aid_application.send(:"#{attribute}_report")
         send_data report.document.download,
                   status: 200,
                   type: "application/pdf",
diff --git a/app/forms/base_form.rb b/app/forms/base_form.rb
index 8ad2b07fb6..b1e9221e3e 100644
--- a/app/forms/base_form.rb
+++ b/app/forms/base_form.rb
@@ -35,7 +35,7 @@ def locally_assigned
 
     def normalizes(name, with:)
       before_validation do
-        send("#{name}=", with.call(send(name)))
+        send(:"#{name}=", with.call(send(name)))
       end
     end
   end
diff --git a/app/forms/chances_of_successes/success_prospect_form.rb b/app/forms/chances_of_successes/success_prospect_form.rb
index d5831f40ec..acacfd41f2 100644
--- a/app/forms/chances_of_successes/success_prospect_form.rb
+++ b/app/forms/chances_of_successes/success_prospect_form.rb
@@ -56,12 +56,12 @@ def extrapolate_details
       return unless success_prospect_details_expandable?
 
       field = "success_prospect_details_#{success_prospect}"
-      __send__("#{field}=", success_prospect_details)
+      __send__(:"#{field}=", success_prospect_details)
       attributes[field] = success_prospect_details
     end
 
     def success_prospect_details_expandable?
-      success_prospect_details.present? && __send__("success_prospect_details_#{success_prospect}").nil?
+      success_prospect_details.present? && __send__(:"success_prospect_details_#{success_prospect}").nil?
     end
   end
 end
diff --git a/app/forms/partners/offline_accounts_form.rb b/app/forms/partners/offline_accounts_form.rb
index 7f1e5f07bb..0328f6caa7 100644
--- a/app/forms/partners/offline_accounts_form.rb
+++ b/app/forms/partners/offline_accounts_form.rb
@@ -52,7 +52,7 @@ def empty_unchecked_values
         check_box_attribute = :"check_box_#{attribute}"
         if send(check_box_attribute).blank?
           attributes[attribute] = nil
-          send("#{attribute}=", nil)
+          send(:"#{attribute}=", nil)
         end
       end
     end
diff --git a/app/forms/proceedings/scope_limitations_form.rb b/app/forms/proceedings/scope_limitations_form.rb
index 9393706658..4915dc4e8b 100644
--- a/app/forms/proceedings/scope_limitations_form.rb
+++ b/app/forms/proceedings/scope_limitations_form.rb
@@ -69,7 +69,7 @@ def save(params)
 
     def update_scope_attributes(params)
       params.each do |key, value|
-        __send__("#{key}=", value)
+        __send__(:"#{key}=", value)
       end
     end
 
@@ -80,7 +80,7 @@ def update_populated_dates
     end
 
     def populate_inputted_date(code)
-      __send__("hearing_date_#{code}=", date_fields(code).form_date) if scope_codes.include? code
+      __send__(:"hearing_date_#{code}=", date_fields(code).form_date) if scope_codes.include? code
     end
 
     def date_fields(code, value = nil)
diff --git a/app/forms/providers/application_merits_task/client_offered_undertakings_form.rb b/app/forms/providers/application_merits_task/client_offered_undertakings_form.rb
index 41d8da348d..7c438337be 100644
--- a/app/forms/providers/application_merits_task/client_offered_undertakings_form.rb
+++ b/app/forms/providers/application_merits_task/client_offered_undertakings_form.rb
@@ -35,12 +35,12 @@ def extrapolate_additional_information
         return unless additional_information_expandable?
 
         field = "additional_information_#{offered}"
-        __send__("#{field}=", additional_information)
+        __send__(:"#{field}=", additional_information)
         attributes[field] = additional_information
       end
 
       def additional_information_expandable?
-        additional_information.present? && __send__("additional_information_#{offered}").nil?
+        additional_information.present? && __send__(:"additional_information_#{offered}").nil?
       end
 
       def exclude_from_model
diff --git a/app/forms/providers/application_merits_task/domestic_abuse_summary_form.rb b/app/forms/providers/application_merits_task/domestic_abuse_summary_form.rb
index 3ef5db5b9a..a76534ff54 100644
--- a/app/forms/providers/application_merits_task/domestic_abuse_summary_form.rb
+++ b/app/forms/providers/application_merits_task/domestic_abuse_summary_form.rb
@@ -41,7 +41,7 @@ def initialize(*args)
       def police_notified_presence
         return if police_notified.blank?
 
-        value = __send__("police_notified_details_#{police_notified}")
+        value = __send__(:"police_notified_details_#{police_notified}")
         return if value.present? || draft?
 
         translation_path = "activemodel.errors.models.opponent.attributes.police_notified_details_#{police_notified}.blank"
@@ -51,7 +51,7 @@ def police_notified_presence
       def interpolate_police_notified_details
         return unless [true, false, "true", "false"].include?(police_notified)
 
-        value = __send__("police_notified_details_#{police_notified}")
+        value = __send__(:"police_notified_details_#{police_notified}")
         @police_notified_details = value&.empty? ? nil : value
         attributes["police_notified_details"] = @police_notified_details
       end
@@ -61,7 +61,7 @@ def extrapolate_police_notified_details
         return unless police_notified_details_expandable?
 
         field = "police_notified_details_#{police_notified}"
-        __send__("#{field}=", police_notified_details)
+        __send__(:"#{field}=", police_notified_details)
         attributes[field] = police_notified_details
       end
 
@@ -74,7 +74,7 @@ def clear_bail_details
       end
 
       def police_notified_details_expandable?
-        police_notified_details.present? && __send__("police_notified_details_#{police_notified}").nil?
+        police_notified_details.present? && __send__(:"police_notified_details_#{police_notified}").nil?
       end
     end
   end
diff --git a/app/forms/providers/regular_transaction_form.rb b/app/forms/providers/regular_transaction_form.rb
index 5978b2f0c2..bd8d256e16 100644
--- a/app/forms/providers/regular_transaction_form.rb
+++ b/app/forms/providers/regular_transaction_form.rb
@@ -102,8 +102,8 @@ def existing_transaction_type_ids
     def assign_regular_transaction_attributes
       regular_transactions.each do |transaction|
         transaction_type = transaction.transaction_type
-        public_send("#{transaction_type.name}_amount=", transaction.amount)
-        public_send("#{transaction_type.name}_frequency=", transaction.frequency)
+        public_send(:"#{transaction_type.name}_amount=", transaction.amount)
+        public_send(:"#{transaction_type.name}_frequency=", transaction.frequency)
       end
     end
 
@@ -162,8 +162,8 @@ def transaction_types
     def all_regular_transactions_valid
       regular_transactions.each do |transaction|
         transaction_type = transaction.transaction_type
-        transaction.amount = public_send("#{transaction_type.name}_amount")
-        transaction.frequency = public_send("#{transaction_type.name}_frequency")
+        transaction.amount = public_send(:"#{transaction_type.name}_amount")
+        transaction.frequency = public_send(:"#{transaction_type.name}_frequency")
 
         next if transaction.valid?
 
diff --git a/app/forms/savings_amounts/offline_accounts_form.rb b/app/forms/savings_amounts/offline_accounts_form.rb
index 32aafbd314..c92b0f6f37 100644
--- a/app/forms/savings_amounts/offline_accounts_form.rb
+++ b/app/forms/savings_amounts/offline_accounts_form.rb
@@ -66,7 +66,7 @@ def empty_unchecked_values
         check_box_attribute = :"check_box_#{attribute}"
         if send(check_box_attribute).blank?
           attributes[attribute] = nil
-          send("#{attribute}=", nil)
+          send(:"#{attribute}=", nil)
         end
       end
     end
diff --git a/app/forms/savings_amounts/savings_amounts_form.rb b/app/forms/savings_amounts/savings_amounts_form.rb
index e4ebfcc50a..655c62e7a1 100644
--- a/app/forms/savings_amounts/savings_amounts_form.rb
+++ b/app/forms/savings_amounts/savings_amounts_form.rb
@@ -58,7 +58,7 @@ def empty_unchecked_values
         check_box_attribute = :"check_box_#{attribute}"
         if send(check_box_attribute).blank?
           attributes[attribute] = nil
-          send("#{attribute}=", nil)
+          send(:"#{attribute}=", nil)
         end
       end
     end
diff --git a/app/models/base_aggregated_cash_transaction.rb b/app/models/base_aggregated_cash_transaction.rb
index c09b00b6e5..128413e663 100644
--- a/app/models/base_aggregated_cash_transaction.rb
+++ b/app/models/base_aggregated_cash_transaction.rb
@@ -47,7 +47,7 @@ def populate_attribute(model, trx)
       checkbox_method = "check_box_#{trx.transaction_type.name}="
       model.__send__(value_method, trx.amount)
       model.__send__(checkbox_method, "true")
-      model.__send__("month#{trx.month_number}=", trx.transaction_date)
+      model.__send__(:"month#{trx.month_number}=", trx.transaction_date)
     end
 
     def find_by(legal_aid_application_id:, owner:)
@@ -84,12 +84,12 @@ def month_name(month_number)
 private
 
   def transaction_date(month_number)
-    __send__("month#{month_number}")
+    __send__(:"month#{month_number}")
   end
 
   def update_cash_attributes(params)
     params.each do |key, value|
-      __send__("#{key}=", value)
+      __send__(:"#{key}=", value)
     end
   end
 
diff --git a/app/models/concerns/binary_choice_form.rb b/app/models/concerns/binary_choice_form.rb
index b0434ec4f8..6a4a0c078b 100644
--- a/app/models/concerns/binary_choice_form.rb
+++ b/app/models/concerns/binary_choice_form.rb
@@ -12,7 +12,7 @@ def call(journey:, radio_buttons_input_name:, action: :show, form_params: nil, e
     end
 
     def define_input_conditional(input_name, form_params)
-      define_method "#{input_name}?" do
+      define_method :"#{input_name}?" do
         form_params[input_name] == "true"
       end
     end
diff --git a/app/models/legal_aid_application.rb b/app/models/legal_aid_application.rb
index d1e1192869..983978f314 100644
--- a/app/models/legal_aid_application.rb
+++ b/app/models/legal_aid_application.rb
@@ -276,7 +276,7 @@ def parent_transaction_types
   def uncategorised_transactions?(type)
     bank_trx = bank_transactions_by_type(type)
     cash_trx = cash_transactions_by_type(type)
-    parent_transaction_types.__send__("#{type}s").each do |transaction_type|
+    parent_transaction_types.__send__(:"#{type}s").each do |transaction_type|
       uncategorised_transactions_errors(transaction_type) unless any_transactions_selected?(transaction_type, bank_trx, cash_trx)
     end
     errors.present?
@@ -492,7 +492,7 @@ def policy_disregards?
   end
 
   def transactions_total_by_type(transaction_type, category_id)
-    __send__("#{transaction_type}_transactions").amounts.fetch(category_id, 0)
+    __send__(:"#{transaction_type}_transactions").amounts.fetch(category_id, 0)
   end
 
   def hmrc_employment_income?
@@ -574,7 +574,7 @@ def bank_transactions_by_type(type)
   end
 
   def cash_transactions_by_type(type)
-    cash_transactions.__send__("#{type}s").order(transaction_date: :desc).by_parent_transaction_type
+    cash_transactions.__send__(:"#{type}s").order(transaction_date: :desc).by_parent_transaction_type
   end
 
   def any_transactions_selected?(transaction_type, bank_trx, cash_trx)
diff --git a/app/presenters/bank_transaction_presenter.rb b/app/presenters/bank_transaction_presenter.rb
index f7c1fc4726..6b2d0f6ded 100644
--- a/app/presenters/bank_transaction_presenter.rb
+++ b/app/presenters/bank_transaction_presenter.rb
@@ -33,7 +33,7 @@ def initialize(item, remarks)
 
   def build_transaction_hash
     values = {}
-    CELLS.map { |k| values[k.to_sym] = send("transaction_#{k}") }
+    CELLS.map { |k| values[k.to_sym] = send(:"transaction_#{k}") }
     values
   end
 
diff --git a/app/services/flow/merits_loop.rb b/app/services/flow/merits_loop.rb
index 52b165689d..76044a327b 100644
--- a/app/services/flow/merits_loop.rb
+++ b/app/services/flow/merits_loop.rb
@@ -49,7 +49,7 @@ def convert_task_to_flow_name(task)
     end
 
     def not_started_tasks
-      @not_started_tasks ||= grouped_tasks.map { |task|
+      @not_started_tasks ||= grouped_tasks.filter_map do |task|
         next unless task.state == :not_started
 
         {
@@ -58,7 +58,7 @@ def not_started_tasks
           url: I18n.t(task.name, scope: "providers.merits_task_lists.show.urls"),
           state: task.state,
         }
-      }&.compact
+      end
     end
 
     def grouped_tasks
diff --git a/app/services/reports/mis/application_detail_csv_line.rb b/app/services/reports/mis/application_detail_csv_line.rb
index 3280e9c654..449a1bf368 100644
--- a/app/services/reports/mis/application_detail_csv_line.rb
+++ b/app/services/reports/mis/application_detail_csv_line.rb
@@ -419,7 +419,7 @@ def employment_concatenation
       end
 
       def convert_employment_type_to_string(value)
-        value.humanize if laa.applicant.send("#{value}?")
+        value.humanize if laa.applicant.send(:"#{value}?")
       end
 
       def gateway_evidence_count
diff --git a/app/views/providers/means/other_assets/_second_home_conditional_checkbox.html.erb b/app/views/providers/means/other_assets/_second_home_conditional_checkbox.html.erb
index 25deca6dee..ff1df24959 100644
--- a/app/views/providers/means/other_assets/_second_home_conditional_checkbox.html.erb
+++ b/app/views/providers/means/other_assets/_second_home_conditional_checkbox.html.erb
@@ -1,5 +1,5 @@
 <% check_box_attribute = "check_box_second_home" %>
-<% @form.__send__("#{check_box_attribute}=", model.send(check_box_attribute).present? || model.any_second_home_value_present?) %>
+<% @form.__send__(:"#{check_box_attribute}=", model.send(check_box_attribute).present? || model.any_second_home_value_present?) %>
 
 <%= form.govuk_check_box check_box_attribute,
                          true,
diff --git a/app/views/providers/means/other_assets/show.html.erb b/app/views/providers/means/other_assets/show.html.erb
index 3ab0a21961..3ff828bf7d 100644
--- a/app/views/providers/means/other_assets/show.html.erb
+++ b/app/views/providers/means/other_assets/show.html.erb
@@ -35,7 +35,7 @@
           <% Providers::OtherAssetsForm::SINGLE_VALUE_ATTRIBUTES.each do |attribute| %>
             <% check_box_attribute = "check_box_#{attribute}" %>
             <% value = @form.send(attribute) %>
-            <% @form.__send__("#{check_box_attribute}=", @form.send(check_box_attribute).present? || value.present?) %>
+            <% @form.__send__(:"#{check_box_attribute}=", @form.send(check_box_attribute).present? || value.present?) %>
             <%= form.govuk_check_box check_box_attribute,
                                      true,
                                      multiple: false,
diff --git a/app/views/providers/means/savings_and_investments/show.html.erb b/app/views/providers/means/savings_and_investments/show.html.erb
index e3d260036b..9931cf29cd 100644
--- a/app/views/providers/means/savings_and_investments/show.html.erb
+++ b/app/views/providers/means/savings_and_investments/show.html.erb
@@ -18,7 +18,7 @@
         <% attributes.each_with_index do |attribute, idx| %>
           <% check_box_attribute = "check_box_#{attribute}" %>
           <% value = @form.send(attribute) %>
-          <% @form.__send__("#{check_box_attribute}=", @form.send(check_box_attribute).present? || value.present?) %>
+          <% @form.__send__(:"#{check_box_attribute}=", @form.send(check_box_attribute).present? || value.present?) %>
           <%= form.govuk_check_box check_box_attribute.to_sym,
                                    true,
                                    multiple: false,
diff --git a/app/views/shared/partials/_revealing_checkbox.html.erb b/app/views/shared/partials/_revealing_checkbox.html.erb
index 64e3fba1f5..807c2fb822 100644
--- a/app/views/shared/partials/_revealing_checkbox.html.erb
+++ b/app/views/shared/partials/_revealing_checkbox.html.erb
@@ -1,5 +1,5 @@
 <% field_name = "check_box_#{name}"
-   model.__send__("#{field_name}=", model.send(field_name).present?)
+   model.__send__(:"#{field_name}=", model.send(field_name).present?)
    error_class = nil %>
 
 <%= form.govuk_check_box field_name, true, "", link_errors: true, multiple: false, label: { text: controller_t("check_box_#{name}") } do %>
@@ -13,7 +13,7 @@
     <% end %>
     <%= form.govuk_text_field "#{name}#{number}",
                               label: { text: model.period(number) },
-                              value: gds_number_to_currency(model.__send__("#{name}#{number}"), unit: ""),
+                              value: gds_number_to_currency(model.__send__(:"#{name}#{number}"), unit: ""),
                               prefix_text: defined?(input_prefix) ? input_prefix : nil,
                               form_group: { classes: error_class },
                               width: "one-third" %>
diff --git a/spec/support/pundit_matcher.rb b/spec/support/pundit_matcher.rb
index a07a2e0bd0..304198305a 100644
--- a/spec/support/pundit_matcher.rb
+++ b/spec/support/pundit_matcher.rb
@@ -1,6 +1,6 @@
 RSpec::Matchers.define :permit do |action|
   match do |policy|
-    policy.public_send("#{action}?")
+    policy.public_send(:"#{action}?")
   end
 
   failure_message_when_negated do |policy|