diff --git a/.rubocop.yml b/.rubocop.yml
index 76ab3ff84..b8b692370 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -444,76 +444,76 @@ Metrics/PerceivedComplexity:
   Enabled: false
 
 Performance/Caller:
-  Enabled: false
+  Enabled: true
 
 Performance/CaseWhenSplat:
-  Enabled: false
+  Enabled: true
 
 Performance/Casecmp:
-  Enabled: false
+  Enabled: true
 
 Performance/CompareWithBlock:
-  Enabled: false
+  Enabled: true
 
 Performance/Count:
-  Enabled: false
+  Enabled: true
 
 Performance/Detect:
-  Enabled: false
+  Enabled: true
 
 Performance/DoubleStartEndWith:
-  Enabled: false
+  Enabled: true
 
 Performance/EndWith:
-  Enabled: false
+  Enabled: true
 
 Performance/FixedSize:
-  Enabled: false
+  Enabled: true
 
 Performance/FlatMap:
-  Enabled: false
+  Enabled: true
 
 Performance/HashEachMethods:
-  Enabled: false
+  Enabled: true
 
 Performance/LstripRstrip:
-  Enabled: false
+  Enabled: true
 
 Performance/RangeInclude:
-  Enabled: false
+  Enabled: true
 
 Performance/RedundantBlockCall:
-  Enabled: false
+  Enabled: true
 
 Performance/RedundantMatch:
-  Enabled: false
+  Enabled: true
 
 Performance/RedundantMerge:
-  Enabled: false
+  Enabled: true
 
 Performance/RedundantSortBy:
-  Enabled: false
+  Enabled: true
 
 Performance/RegexpMatch:
-  Enabled: false
+  Enabled: true
 
 Performance/ReverseEach:
-  Enabled: false
+  Enabled: true
 
 Performance/Sample:
-  Enabled: false
+  Enabled: true
 
 Performance/Size:
-  Enabled: false
+  Enabled: true
 
 Performance/StartWith:
-  Enabled: false
+  Enabled: true
 
 Performance/StringReplacement:
-  Enabled: false
+  Enabled: true
 
 Performance/TimesMap:
-  Enabled: false
+  Enabled: true
 
 Rails/ActionFilter:
   Enabled: false
diff --git a/app/controllers/admin/attestation_templates_controller.rb b/app/controllers/admin/attestation_templates_controller.rb
index 4988fdce8..10fdb2994 100644
--- a/app/controllers/admin/attestation_templates_controller.rb
+++ b/app/controllers/admin/attestation_templates_controller.rb
@@ -63,8 +63,8 @@ class Admin::AttestationTemplatesController < AdminController
         .permit(:title, :body, :footer, :signature)
         .merge(activated: true)
 
-      @activated_attestation_params.merge!(logo: uninterlaced_png(params['attestation_template']['logo']))
-      @activated_attestation_params.merge!(signature: uninterlaced_png(params['attestation_template']['signature']))
+      @activated_attestation_params[:logo] = uninterlaced_png(params['attestation_template']['logo'])
+      @activated_attestation_params[:signature] = uninterlaced_png(params['attestation_template']['signature'])
     end
 
     @activated_attestation_params
diff --git a/app/controllers/stats_controller.rb b/app/controllers/stats_controller.rb
index 3a9555137..766a4fb2f 100644
--- a/app/controllers/stats_controller.rb
+++ b/app/controllers/stats_controller.rb
@@ -52,7 +52,7 @@ class StatsController < ApplicationController
       .group("DATE_TRUNC('month', #{date_attribute.to_s})")
       .count
       .to_a
-      .sort{ |x, y| x[0] <=> y[0] }
+      .sort_by { |a| a[0] }
       .map { |e| [I18n.l(e.first, format: "%B %Y"), e.last] }
   end
 
@@ -63,7 +63,7 @@ class StatsController < ApplicationController
       .group("DATE_TRUNC('month', #{date_attribute.to_s})")
       .count
       .to_a
-      .sort{ |x, y| x[0] <=> y[0] }
+      .sort_by { |a| a[0] }
       .map { |x, y| { x => (sum += y)} }
       .reduce({}, :merge)
   end
diff --git a/app/lib/siade/api.rb b/app/lib/siade/api.rb
index c182ab8c8..1e36c44fb 100644
--- a/app/lib/siade/api.rb
+++ b/app/lib/siade/api.rb
@@ -27,7 +27,7 @@ class SIADE::API
   end
 
   def self.call(url, params = {})
-    params.merge!(token: SIADETOKEN)
+    params[:token] = SIADETOKEN
 
     verify_ssl_mode = OpenSSL::SSL::VERIFY_NONE
 
diff --git a/app/serializers/etablissement_csv_serializer.rb b/app/serializers/etablissement_csv_serializer.rb
index 1d6e28315..c53ce3342 100644
--- a/app/serializers/etablissement_csv_serializer.rb
+++ b/app/serializers/etablissement_csv_serializer.rb
@@ -1,5 +1,5 @@
 class EtablissementCsvSerializer < EtablissementSerializer
   def adresse
-    object.adresse.chomp.gsub("\r\n", ' ').gsub("\r", '')
+    object.adresse.chomp.gsub("\r\n", ' ').delete("\r")
   end
 end
diff --git a/app/services/dossier_service.rb b/app/services/dossier_service.rb
index bdd2e85ca..54341009c 100644
--- a/app/services/dossier_service.rb
+++ b/app/services/dossier_service.rb
@@ -43,8 +43,8 @@ class DossierService
     unless @france_connect_information.nil?
 
       mandataires_list.each do |mandataire|
-        return true if mandataire[:nom].upcase == @france_connect_information.family_name.upcase &&
-            mandataire[:prenom].upcase == @france_connect_information.given_name.upcase &&
+        return true if mandataire[:nom].casecmp(@france_connect_information.family_name).zero? &&
+            mandataire[:prenom].casecmp(@france_connect_information.given_name).zero? &&
             mandataire[:date_naissance_timestamp] == @france_connect_information.birthdate.to_time.to_i
       end
     end
diff --git a/app/services/dossiers_list_gestionnaire_service.rb b/app/services/dossiers_list_gestionnaire_service.rb
index 9dc86f8ec..b1dfedd29 100644
--- a/app/services/dossiers_list_gestionnaire_service.rb
+++ b/app/services/dossiers_list_gestionnaire_service.rb
@@ -132,7 +132,7 @@ class DossiersListGestionnaireService
   def where_filter
     filter_preference_list.inject('') do |acc, preference|
       unless preference.filter.blank?
-        filter = preference.filter.gsub('*', '%').gsub("'", "''")
+        filter = preference.filter.tr('*', '%').gsub("'", "''")
         filter = "%" + filter + "%" unless filter.include? '%'
 
         value = preference.table_with_s_attr
diff --git a/app/services/module_api_carto_service.rb b/app/services/module_api_carto_service.rb
index d32307e87..2cff27de4 100644
--- a/app/services/module_api_carto_service.rb
+++ b/app/services/module_api_carto_service.rb
@@ -4,7 +4,7 @@ class ModuleApiCartoService
       qp_list = generate_qp JSON.parse(json_latlngs)
 
       qp_list.each_value do |qp|
-        qp.merge!({dossier_id: dossier.id})
+        qp[:dossier_id] = dossier.id
         qp[:geometry] = qp[:geometry].to_json
         QuartierPrioritaire.create(qp)
       end
@@ -16,7 +16,7 @@ class ModuleApiCartoService
       cadastre_list = generate_cadastre JSON.parse(json_latlngs)
 
       cadastre_list.each do |cadastre|
-        cadastre.merge!({dossier_id: dossier.id})
+        cadastre[:dossier_id] = dossier.id
         cadastre[:geometry] = cadastre[:geometry].to_json
         Cadastre.create(cadastre)
       end
diff --git a/lib/tasks/dev.rake b/lib/tasks/dev.rake
index fee0c6d45..8e8d48257 100644
--- a/lib/tasks/dev.rake
+++ b/lib/tasks/dev.rake
@@ -12,7 +12,7 @@ namespace :dev do
 
   task :generate_token_file do
     puts 'creating token.rb file'
-    res = `rake secret`.gsub("\n", '')
+    res = `rake secret`.delete("\n")
     file = File.new('config/initializers/token.rb', 'w+')
     comment = <<EOF
 EOF