diff --git a/.rubocop.yml b/.rubocop.yml
index baac68548..61ec40311 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -288,6 +288,9 @@ Rails/OutputSafety:
   Exclude:
     - app/helpers/text_with_links_helper.rb
 
+Rails/Pick:
+  Enabled: true
+
 Rails/PluckId:
   Enabled: true
 
diff --git a/Gemfile b/Gemfile
index e3537bce2..a9cb8fbbd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -72,7 +72,6 @@ end
 group :development, :test do
   gem "bullet", "~> 6.1.4"
   gem "byebug", "~> 11.1.3"
-  gem "database_cleaner", "~> 2.0.1"
   gem "factory_bot_rails", "~> 6.2.0"
   gem "faker", "~> 2.18.0"
   gem "i18n-tasks", "~> 0.9.34"
diff --git a/Gemfile.lock b/Gemfile.lock
index ee0c8f765..8287adb66 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -168,12 +168,6 @@ GEM
     crass (1.0.6)
     daemons (1.4.0)
     dalli (2.7.11)
-    database_cleaner (2.0.1)
-      database_cleaner-active_record (~> 2.0.0)
-    database_cleaner-active_record (2.0.1)
-      activerecord (>= 5.a)
-      database_cleaner-core (~> 2.0.0)
-    database_cleaner-core (2.0.1)
     delayed_job (4.1.9)
       activesupport (>= 3.0, < 6.2)
     delayed_job_active_record (4.1.6)
@@ -730,7 +724,6 @@ DEPENDENCIES
   coveralls (~> 0.8.23)
   daemons (~> 1.4.0)
   dalli (~> 2.7.11)
-  database_cleaner (~> 2.0.1)
   delayed_job_active_record (~> 4.1.6)
   devise (~> 4.8.0)
   devise-security (~> 0.16.0)
diff --git a/app/models/concerns/attachable.rb b/app/models/concerns/attachable.rb
index cc457f934..87bd92363 100644
--- a/app/models/concerns/attachable.rb
+++ b/app/models/concerns/attachable.rb
@@ -5,9 +5,8 @@ module Attachable
     has_one_attached :attachment
     attr_accessor :cached_attachment
 
-    validate :attachment_presence
-
     validates :attachment,
+      presence: true,
       file_content_type: {
         allow: ->(record) { record.accepted_content_types },
         if: -> { association_class && attachment.attached? },
@@ -63,12 +62,4 @@ module Attachable
   def file_path
     ActiveStorage::Blob.service.path_for(attachment.blob.key)
   end
-
-  private
-
-    def attachment_presence
-      unless attachment.attached?
-        errors.add(:attachment, I18n.t("errors.messages.blank"))
-      end
-    end
 end
diff --git a/app/models/setting.rb b/app/models/setting.rb
index 63e326e09..9fa1e7d68 100644
--- a/app/models/setting.rb
+++ b/app/models/setting.rb
@@ -31,7 +31,7 @@ class Setting < ApplicationRecord
 
   class << self
     def [](key)
-      where(key: key).pluck(:value).first.presence
+      where(key: key).pick(:value).presence
     end
 
     def []=(key, value)
@@ -42,7 +42,7 @@ class Setting < ApplicationRecord
 
     def rename_key(from:, to:)
       if where(key: to).empty?
-        value = where(key: from).pluck(:value).first.presence
+        value = where(key: from).pick(:value).presence
         create!(key: to, value: value)
       end
       remove(from)
diff --git a/app/views/shared/_errors.html.erb b/app/views/shared/_errors.html.erb
index fff7801f8..80f49048c 100644
--- a/app/views/shared/_errors.html.erb
+++ b/app/views/shared/_errors.html.erb
@@ -5,7 +5,7 @@
     </button>
 
     <strong>
-      <% errors_count = resource.errors.messages.reject { |attribute| attribute == :base }.count %>
+      <% errors_count = resource.errors.messages.excluding(:base).count %>
 
       <%= pluralize errors_count, t("form.error"), t("form.errors") %>
 
diff --git a/config/initializers/globalize.rb b/config/initializers/globalize.rb
index 7d93e9fda..80fd85ca8 100644
--- a/config/initializers/globalize.rb
+++ b/config/initializers/globalize.rb
@@ -17,7 +17,7 @@ module Globalize
 end
 
 def Globalize.set_fallbacks_to_all_available_locales
-  Globalize.fallbacks = I18n.available_locales.each_with_object({}) do |locale, fallbacks|
-    fallbacks[locale] = (I18n.fallbacks[locale] + I18n.available_locales).uniq
+  Globalize.fallbacks = I18n.available_locales.index_with do |locale|
+    (I18n.fallbacks[locale] + I18n.available_locales).uniq
   end
 end
diff --git a/db/dev_seeds.rb b/db/dev_seeds.rb
index bdbacaff3..ebcfeacb5 100644
--- a/db/dev_seeds.rb
+++ b/db/dev_seeds.rb
@@ -1,7 +1,4 @@
-unless Rails.env.test?
-  require "database_cleaner"
-  DatabaseCleaner.clean_with :truncation
-end
+ActiveRecord::Tasks::DatabaseTasks.truncate_all unless Rails.env.test?
 @logger = Logger.new(STDOUT)
 @logger.formatter = proc do |_severity, _datetime, _progname, msg|
                       msg unless @avoid_log
diff --git a/db/dev_seeds/admin_notifications.rb b/db/dev_seeds/admin_notifications.rb
index fee6ebeb5..47e2a8702 100644
--- a/db/dev_seeds/admin_notifications.rb
+++ b/db/dev_seeds/admin_notifications.rb
@@ -1,33 +1,33 @@
 section "Creating Admin Notifications & Templates" do
   AdminNotification.create!(
     random_locales_attributes(
-      %i[title body].map do |attribute|
-        [attribute, -> { I18n.t("seeds.admin_notifications.proposal.#{attribute}") }]
-      end.to_h
+      %i[title body].index_with do |attribute|
+        -> { I18n.t("seeds.admin_notifications.proposal.#{attribute}") }
+      end
     ).merge(link: "#{Setting["url"]}/proposals", segment_recipient: "administrators")
   ).deliver
 
   AdminNotification.create!(
     random_locales_attributes(
-      %i[title body].map do |attribute|
-        [attribute, -> { I18n.t("seeds.admin_notifications.help.#{attribute}") }]
-      end.to_h
+      %i[title body].index_with do |attribute|
+        -> { I18n.t("seeds.admin_notifications.help.#{attribute}") }
+      end
     ).merge(link: "https://crwd.in/consul", segment_recipient: "administrators")
   ).deliver
 
   AdminNotification.create!(
     random_locales_attributes(
-      %i[title body].map do |attribute|
-        [attribute, -> { I18n.t("seeds.admin_notifications.map.#{attribute}") }]
-      end.to_h
+      %i[title body].index_with do |attribute|
+        -> { I18n.t("seeds.admin_notifications.map.#{attribute}") }
+      end
     ).merge(segment_recipient: "administrators")
   ).deliver
 
   AdminNotification.create!(
     random_locales_attributes(
-      %i[title body].map do |attribute|
-        [attribute, -> { I18n.t("seeds.admin_notifications.budget.#{attribute}") }]
-      end.to_h
+      %i[title body].index_with do |attribute|
+        -> { I18n.t("seeds.admin_notifications.budget.#{attribute}") }
+      end
     ).merge(segment_recipient: "administrators", sent_at: nil)
   )
 end
diff --git a/db/dev_seeds/widgets.rb b/db/dev_seeds/widgets.rb
index d82d655fe..d77940f7d 100644
--- a/db/dev_seeds/widgets.rb
+++ b/db/dev_seeds/widgets.rb
@@ -9,9 +9,9 @@ section "Creating header and cards for the homepage" do
 
   Widget::Card.create!(
     random_locales_attributes(
-      %i[title description link_text label].map do |attribute|
-        [attribute, -> { I18n.t("seeds.cards.header.#{attribute}") }]
-      end.to_h
+      %i[title description link_text label].index_with do |attribute|
+        -> { I18n.t("seeds.cards.header.#{attribute}") }
+      end
     ).merge(
       link_url: "http://consulproject.org/",
       header: true,
@@ -21,9 +21,9 @@ section "Creating header and cards for the homepage" do
 
   Widget::Card.create!(
     random_locales_attributes(
-      %i[title description link_text label].map do |attribute|
-        [attribute, -> { I18n.t("seeds.cards.debate.#{attribute}") }]
-      end.to_h
+      %i[title description link_text label].index_with do |attribute|
+        -> { I18n.t("seeds.cards.debate.#{attribute}") }
+      end
     ).merge(
       link_url: "https://youtu.be/zU_0UN4VajY",
       header: false,
@@ -33,9 +33,9 @@ section "Creating header and cards for the homepage" do
 
   Widget::Card.create!(
     random_locales_attributes(
-      %i[title description link_text label].map do |attribute|
-        [attribute, -> { I18n.t("seeds.cards.proposal.#{attribute}") }]
-      end.to_h
+      %i[title description link_text label].index_with do |attribute|
+        -> { I18n.t("seeds.cards.proposal.#{attribute}") }
+      end
     ).merge(
       link_url: "https://youtu.be/ZHqBpT4uCoM",
       header: false,
@@ -45,9 +45,9 @@ section "Creating header and cards for the homepage" do
 
   Widget::Card.create!(
     random_locales_attributes(
-      %i[title description link_text label].map do |attribute|
-        [attribute, -> { I18n.t("seeds.cards.budget.#{attribute}") }]
-      end.to_h
+      %i[title description link_text label].index_with do |attribute|
+        -> { I18n.t("seeds.cards.budget.#{attribute}") }
+      end
     ).merge(
       link_url: "https://youtu.be/igQ8KGZdk9c",
       header: false,
diff --git a/spec/models/budget/investment_spec.rb b/spec/models/budget/investment_spec.rb
index fa8bb73f8..a0d4e2ef4 100644
--- a/spec/models/budget/investment_spec.rb
+++ b/spec/models/budget/investment_spec.rb
@@ -160,7 +160,7 @@ describe Budget::Investment do
     end
 
     it "returns false in any other phase" do
-      Budget::Phase::PHASE_KINDS.reject { |phase| phase == "selecting" }.each do |phase|
+      Budget::Phase::PHASE_KINDS.excluding("selecting").each do |phase|
         budget = create(:budget, phase: phase)
         investment = create(:budget_investment, budget: budget)
 
@@ -178,7 +178,7 @@ describe Budget::Investment do
     end
 
     it "returns false in any other phase" do
-      Budget::Phase::PHASE_KINDS.reject { |phase| phase == "valuating" }.each do |phase|
+      Budget::Phase::PHASE_KINDS.excluding("valuating").each do |phase|
         budget = create(:budget, phase: phase)
         investment = create(:budget_investment, budget: budget)
 
@@ -203,7 +203,7 @@ describe Budget::Investment do
     end
 
     it "returns false in any other phase" do
-      Budget::Phase::PHASE_KINDS.reject { |phase| phase == "balloting" }.each do |phase|
+      Budget::Phase::PHASE_KINDS.excluding("balloting").each do |phase|
         budget = create(:budget, phase: phase)
         investment = create(:budget_investment, :selected, budget: budget)
 
@@ -1198,7 +1198,7 @@ describe Budget::Investment do
       end
 
       it "returns false if budget is not balloting phase" do
-        Budget::Phase::PHASE_KINDS.reject { |phase| phase == "balloting" }.each do |phase|
+        Budget::Phase::PHASE_KINDS.excluding("balloting").each do |phase|
           budget.update!(phase: phase)
           investment = create(:budget_investment, heading: heading1)
 
diff --git a/spec/models/concerns/globalizable.rb b/spec/models/concerns/globalizable.rb
index 54135137c..0eca3b268 100644
--- a/spec/models/concerns/globalizable.rb
+++ b/spec/models/concerns/globalizable.rb
@@ -16,7 +16,7 @@ shared_examples_for "globalizable" do |factory_name|
     record.update!(attribute => "In English")
 
     I18n.with_locale(:es) do
-      record.update!(required_fields.map { |field| [field, "En español"] }.to_h)
+      record.update!(required_fields.index_with("En español"))
       record.update!(attribute => "En español")
     end
 
@@ -26,7 +26,7 @@ shared_examples_for "globalizable" do |factory_name|
   describe "Add a translation" do
     it "Maintains existing translations" do
       record.update!(translations_attributes: [
-        { locale: :fr }.merge(fields.map { |field| [field, "En Français"] }.to_h)
+        { locale: :fr }.merge(fields.index_with("En Français"))
       ])
       record.reload
 
@@ -37,7 +37,7 @@ shared_examples_for "globalizable" do |factory_name|
 
     it "Works with non-underscored locale name" do
       record.update!(translations_attributes: [
-        { locale: :"pt-BR" }.merge(fields.map { |field| [field, "Português"] }.to_h)
+        { locale: :"pt-BR" }.merge(fields.index_with("Português"))
       ])
       record.reload
 
@@ -63,7 +63,7 @@ shared_examples_for "globalizable" do |factory_name|
       record.reload
 
       record.update!(translations_attributes: [
-        { locale: :de }.merge(fields.map { |field| [field, "Deutsche Sprache"] }.to_h)
+        { locale: :de }.merge(fields.index_with("Deutsche Sprache"))
       ])
 
       record.reload
@@ -102,7 +102,7 @@ shared_examples_for "globalizable" do |factory_name|
       record.reload
 
       record.update!(translations_attributes: [
-        { id: record.translations.first.id }.merge(fields.map { |field| [field, "Actualizado"] }.to_h)
+        { id: record.translations.first.id }.merge(fields.index_with("Actualizado"))
       ])
 
       record.reload
@@ -155,7 +155,7 @@ shared_examples_for "globalizable" do |factory_name|
   describe "Fallbacks" do
     before do
       I18n.with_locale(:de) do
-        record.update!(required_fields.map { |field| [field, "Deutsche Sprache"] }.to_h)
+        record.update!(required_fields.index_with("Deutsche Sprache"))
         record.update!(attribute => "Deutsche Sprache")
       end
     end
diff --git a/spec/models/poll/stats_spec.rb b/spec/models/poll/stats_spec.rb
index abe080fe8..27b7571a0 100644
--- a/spec/models/poll/stats_spec.rb
+++ b/spec/models/poll/stats_spec.rb
@@ -267,7 +267,7 @@ describe Poll::Stats do
 
         expect(stats.version).to eq "v#{time.to_i}"
 
-        travel_back
+        unfreeze_time
 
         travel_to 2.seconds.from_now do
           expect(stats.version).to eq "v#{time.to_i}"
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 7e84626b4..59c87016a 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -45,7 +45,7 @@ RSpec.configure do |config|
     example.run
     self.use_transactional_tests = true
 
-    DatabaseCleaner.clean_with(:truncation)
+    ActiveRecord::Tasks::DatabaseTasks.truncate_all
     Rails.application.load_seed
   end
 
diff --git a/spec/system/admin/poll/shifts_spec.rb b/spec/system/admin/poll/shifts_spec.rb
index 683906622..a5a475092 100644
--- a/spec/system/admin/poll/shifts_spec.rb
+++ b/spec/system/admin/poll/shifts_spec.rb
@@ -96,11 +96,9 @@ describe "Admin shifts", :admin do
     create(:poll_shift, :vote_collection_task, officer: officer, booth: booth, date: Date.current)
     create(:poll_shift, :recount_scrutiny_task, officer: officer, booth: booth, date: Time.zone.tomorrow)
 
-    vote_collection_dates = (Date.current..poll.ends_at.to_date).to_a
-                                                                .reject { |date| date == Date.current }
+    vote_collection_dates = (Date.current..poll.ends_at.to_date).excluding(Date.current)
                                                                 .map { |date| I18n.l(date, format: :long) }
-    recount_scrutiny_dates = (poll.ends_at.to_date..poll.ends_at.to_date + 1.week).to_a
-                                                                                  .reject { |date| date == Time.zone.tomorrow }
+    recount_scrutiny_dates = (poll.ends_at.to_date..poll.ends_at.to_date + 1.week).excluding(Time.zone.tomorrow)
                                                                                   .map { |date| I18n.l(date, format: :long) }
 
     visit available_admin_booths_path
diff --git a/spec/system/polls/voter_spec.rb b/spec/system/polls/voter_spec.rb
index cac36b494..3b9c6bc1d 100644
--- a/spec/system/polls/voter_spec.rb
+++ b/spec/system/polls/voter_spec.rb
@@ -176,7 +176,7 @@ describe "Voter" do
           expect(page).not_to have_link(answer_yes.title)
         end
 
-        travel_back
+        unfreeze_time
 
         click_link "Sign out"