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/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/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