diff --git a/.rubocop.yml b/.rubocop.yml
index 0ca1f41c4..0852a6e43 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -471,7 +471,7 @@ Lint/UnreachableCode:
   Enabled: true
 
 Lint/UnusedBlockArgument:
-  Enabled: false
+  Enabled: true
 
 Lint/UnusedMethodArgument:
   Enabled: false
diff --git a/app/controllers/stats_controller.rb b/app/controllers/stats_controller.rb
index 28d24a4b8..750d46be1 100644
--- a/app/controllers/stats_controller.rb
+++ b/app/controllers/stats_controller.rb
@@ -271,7 +271,7 @@ class StatsController < ApplicationController
       dossiers_grouped_by_procedure = value.group_by { |dossier| dossier[0] }
 
       # Compute the mean time for this procedure
-      procedure_processing_times = dossiers_grouped_by_procedure.map do |procedure_id, procedure_dossiers|
+      procedure_processing_times = dossiers_grouped_by_procedure.map do |_procedure_id, procedure_dossiers|
         procedure_dossiers_processing_time = procedure_dossiers.map do |dossier|
           (dossier[2] - dossier[1]).to_f / (3600 * 24)
         end
diff --git a/app/models/etablissement.rb b/app/models/etablissement.rb
index 1656f1f74..44e5142e9 100644
--- a/app/models/etablissement.rb
+++ b/app/models/etablissement.rb
@@ -91,6 +91,6 @@ class Etablissement < ApplicationRecord
   def message_for_signature
     JSON.pretty_generate(as_json(include: {
       exercices: { only: [:ca, :date_fin_exercice, :date_fin_exercice_timestamp] }
-    }).delete_if { |k, v| v.blank? })
+    }).delete_if { |_k, v| v.blank? })
   end
 end
diff --git a/config/initializers/after_party.rb b/config/initializers/after_party.rb
index 66c8b1071..e9ef95728 100644
--- a/config/initializers/after_party.rb
+++ b/config/initializers/after_party.rb
@@ -1,3 +1,3 @@
-AfterParty.setup do |config|
+AfterParty.setup do |_config|
   require "after_party/active_record.rb"
 end
diff --git a/config/initializers/env_vars.rb b/config/initializers/env_vars.rb
index 9046a8c80..a3a7cd20b 100644
--- a/config/initializers/env_vars.rb
+++ b/config/initializers/env_vars.rb
@@ -5,7 +5,7 @@
 
 if ENV['RAILS_ENV'] != 'test' && File.basename($0) != 'rake'
   reference_env_file = File.join('config', 'env.example')
-  Dotenv::Environment.new(Rails.root.join(reference_env_file)).each do |key, value|
+  Dotenv::Environment.new(Rails.root.join(reference_env_file)).each do |key, _value|
     if !ENV.key?(key.to_s)
       raise "Configuration error: `#{key}` is not present in the process’ environment variables (declared in `#{reference_env_file}`)"
     end
diff --git a/db/migrate/20170215102943_remove_duplicate_email_received.rb b/db/migrate/20170215102943_remove_duplicate_email_received.rb
index 93f052b10..af2c6badd 100644
--- a/db/migrate/20170215102943_remove_duplicate_email_received.rb
+++ b/db/migrate/20170215102943_remove_duplicate_email_received.rb
@@ -2,7 +2,7 @@ class RemoveDuplicateEmailReceived < ActiveRecord::Migration[5.0]
   def change
     all_mails = MailReceived.all
     groupped = all_mails.group_by(&:procedure_id)
-    filtered = groupped.reject { |k, v| v.length < 2 }
+    filtered = groupped.reject { |_k, v| v.length < 2 }
     filtered.each_value do |duplicate_mails|
       duplicate_mails.pop
       duplicate_mails.each(&:destroy)
diff --git a/lib/tasks/2018_02_28_clean_gestionnaire_emails.rake b/lib/tasks/2018_02_28_clean_gestionnaire_emails.rake
index dc3c581bc..6106ae5ab 100644
--- a/lib/tasks/2018_02_28_clean_gestionnaire_emails.rake
+++ b/lib/tasks/2018_02_28_clean_gestionnaire_emails.rake
@@ -1,10 +1,10 @@
 namespace :'2018_02_28_clean_invalid_emails_accounts' do
   task clean: :environment do
-    Gestionnaire.pluck(:email, :id).select { |e, id| e.include?(" ") }.each do |email, id|
+    Gestionnaire.pluck(:email, :id).select { |e, _id| e.include?(" ") }.each do |_email, id|
       Gestionnaire.find_by(id: id, current_sign_in_at: nil)&.destroy # ensure account was never used
     end
 
-    User.pluck(:email, :id).select { |e, id| e.include?(" ") }.each do |email, id|
+    User.pluck(:email, :id).select { |e, _id| e.include?(" ") }.each do |_email, id|
       User.find_by(id: id, current_sign_in_at: nil)&.destroy # ensure account was never used
     end
   end
diff --git a/lib/tasks/admin.rake b/lib/tasks/admin.rake
index 569b6559a..01dd504e6 100644
--- a/lib/tasks/admin.rake
+++ b/lib/tasks/admin.rake
@@ -1,5 +1,5 @@
 namespace :admin do
-  task :create_admin, [:email] => :environment do |t, args|
+  task :create_admin, [:email] => :environment do |_t, args|
     email = args[:email]
     puts "Creating Administration for #{email}"
     a = Administration.new(email: email, password: Devise.friendly_token[0, 20])
@@ -17,7 +17,7 @@ namespace :admin do
     end
   end
 
-  task :delete_admin, [:email] => :environment do |t, args|
+  task :delete_admin, [:email] => :environment do |_t, args|
     email = args[:email]
     puts "Deleting Administration for #{email}"
     a = Administration.find_by(email: email)
diff --git a/spec/controllers/admin/procedures_controller_spec.rb b/spec/controllers/admin/procedures_controller_spec.rb
index 10c7f2828..7a0a0483c 100644
--- a/spec/controllers/admin/procedures_controller_spec.rb
+++ b/spec/controllers/admin/procedures_controller_spec.rb
@@ -511,7 +511,7 @@ describe Admin::ProceduresController, type: :controller do
 
     subject { get :new_from_existing }
     let(:grouped_procedures) { subject; assigns(:grouped_procedures) }
-    let(:response_procedures) { grouped_procedures.map { |o, procedures| procedures }.flatten }
+    let(:response_procedures) { grouped_procedures.map { |_o, procedures| procedures }.flatten }
 
     describe 'selecting' do
       let!(:large_draft_procedure)     { create(:procedure_with_dossiers, dossiers_count: 2) }
@@ -542,8 +542,8 @@ describe Admin::ProceduresController, type: :controller do
 
       it 'groups procedures with services as well as procedures with organisations' do
         expect(grouped_procedures.length).to eq 2
-        expect(grouped_procedures.find { |o, p| o == 'DDT des Vosges' }.last).to contain_exactly(procedure_with_service_1)
-        expect(grouped_procedures.find { |o, p| o == 'DDT du Loiret'  }.last).to contain_exactly(procedure_with_service_2, procedure_without_service)
+        expect(grouped_procedures.find { |o, _p| o == 'DDT des Vosges' }.last).to contain_exactly(procedure_with_service_1)
+        expect(grouped_procedures.find { |o, _p| o == 'DDT du Loiret'  }.last).to contain_exactly(procedure_with_service_2, procedure_without_service)
       end
     end
   end
diff --git a/spec/factories/champ.rb b/spec/factories/champ.rb
index 20d04628d..c1cb471e7 100644
--- a/spec/factories/champ.rb
+++ b/spec/factories/champ.rb
@@ -23,7 +23,7 @@ FactoryBot.define do
     end
 
     trait :with_piece_justificative_file do
-      after(:create) do |champ, evaluator|
+      after(:create) do |champ, _evaluator|
         champ.piece_justificative_file.attach(io: StringIO.new("toto"), filename: "toto.txt", content_type: "text/plain")
       end
     end
@@ -147,7 +147,7 @@ FactoryBot.define do
   factory :champ_piece_justificative, class: 'Champs::PieceJustificativeChamp' do
     type_de_champ { create(:type_de_champ_piece_justificative) }
 
-    after(:create) do |champ, evaluator|
+    after(:create) do |champ, _evaluator|
       champ.piece_justificative_file.attach(io: StringIO.new("toto"), filename: "toto.txt", content_type: "text/plain")
     end
   end
@@ -161,7 +161,7 @@ FactoryBot.define do
     association :etablissement, factory: [:etablissement]
     value { '44011762001530' }
 
-    after(:build) do |champ, evaluator|
+    after(:build) do |champ, _evaluator|
       champ.etablissement.signature = champ.etablissement.sign
     end
   end