diff --git a/.rubocop.yml b/.rubocop.yml
index c316e05..3ec2fa4 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -10,4 +10,8 @@ AllCops:
     - 'config/**/*'
     - 'script/**/*'
     - 'bin/{rails,rake}'
-    - '*.yml'
\ No newline at end of file
+    - '*.yml'
+Layout/LineLength:
+  Max: 120
+RSpec/ExampleLength:
+  Max: 10
\ No newline at end of file
diff --git a/spec/models/expense_spec.rb b/spec/models/expense_spec.rb
index 973ccf2..d6d5f89 100644
--- a/spec/models/expense_spec.rb
+++ b/spec/models/expense_spec.rb
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 require 'rails_helper'
 
-RSpec.describe Expense, type: :model do
+RSpec.describe Expense do
   describe 'validations' do
-    it { should validate_presence_of(:name) }
-    it { should validate_presence_of(:amount) }
-    it { should validate_numericality_of(:amount).is_greater_than(0) }
-    it { should validate_presence_of(:pricing_type) }
+    it { is_expected.to validate_presence_of(:name) }
+    it { is_expected.to validate_presence_of(:amount) }
+    it { is_expected.to validate_numericality_of(:amount).is_greater_than(0) }
+    it { is_expected.to validate_presence_of(:pricing_type) }
   end
 end
diff --git a/spec/models/group_affinity_spec.rb b/spec/models/group_affinity_spec.rb
index 05f9330..9d56d08 100644
--- a/spec/models/group_affinity_spec.rb
+++ b/spec/models/group_affinity_spec.rb
@@ -4,16 +4,20 @@
 
 require 'rails_helper'
 
-RSpec.describe GroupAffinity, type: :model do
+RSpec.describe GroupAffinity do
+  subject(:affinity) { build(:group_affinity, group_a:, group_b:) }
+
   let(:wedding) { create(:wedding) }
   let(:group_a) { create(:group, wedding:) }
   let(:group_b) { create(:group, wedding:) }
   let(:group_c) { create(:group, wedding:) }
 
-  subject { build(:group_affinity, group_a:, group_b: ) }
-
   describe 'validations' do
-    it { should validate_numericality_of(:discomfort).is_greater_than_or_equal_to(0).is_less_than_or_equal_to(2) }
+    it do
+      expect(affinity).to validate_numericality_of(:discomfort)
+        .is_greater_than_or_equal_to(0)
+        .is_less_than_or_equal_to(2)
+    end
   end
 
   describe '.create' do
diff --git a/spec/models/group_spec.rb b/spec/models/group_spec.rb
index 10102f4..1bf6ae3 100644
--- a/spec/models/group_spec.rb
+++ b/spec/models/group_spec.rb
@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 require 'rails_helper'
 
-RSpec.describe Group, type: :model do
+RSpec.describe Group do
   describe 'callbacks' do
-    it 'should set color before create' do
+    it 'sets color before create' do
       expect(create(:group).color).to be_present
     end
   end
diff --git a/spec/models/guest_spec.rb b/spec/models/guest_spec.rb
index 6786271..711e5ca 100644
--- a/spec/models/guest_spec.rb
+++ b/spec/models/guest_spec.rb
@@ -1,12 +1,17 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 require 'rails_helper'
 
-RSpec.describe Guest, type: :model do
+RSpec.describe Guest do
   describe 'validations' do
-    it { should validate_presence_of(:name) }
+    subject(:guest) { build(:guest) }
+
+    it { is_expected.to validate_presence_of(:name) }
+
     it do
-      should define_enum_for(:status).with_values(
+      expect(guest).to define_enum_for(:status).with_values(
         considered: 0,
         invited: 10,
         confirmed: 20,
@@ -16,7 +21,7 @@ RSpec.describe Guest, type: :model do
     end
   end
 
-  it { should belong_to(:group).optional }
+  it { is_expected.to belong_to(:group).optional }
 
   describe 'scopes' do
     describe '.potential' do
@@ -27,7 +32,7 @@ RSpec.describe Guest, type: :model do
         confirmed_guest = create(:guest, status: :confirmed)
         tentative_guest = create(:guest, status: :tentative)
 
-        expect(Guest.potential).to match_array([invited_guest, confirmed_guest, tentative_guest])
+        expect(described_class.potential).to contain_exactly(invited_guest, confirmed_guest, tentative_guest)
       end
     end
   end
diff --git a/spec/models/seat_spec.rb b/spec/models/seat_spec.rb
index 2020f33..86140a2 100644
--- a/spec/models/seat_spec.rb
+++ b/spec/models/seat_spec.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 require 'rails_helper'
 
-RSpec.describe Seat, type: :model do
+RSpec.describe Seat do
   pending "add some examples to (or delete) #{__FILE__}"
 end
diff --git a/spec/models/tables_arrangement_spec.rb b/spec/models/tables_arrangement_spec.rb
index 4db0859..66e61ac 100644
--- a/spec/models/tables_arrangement_spec.rb
+++ b/spec/models/tables_arrangement_spec.rb
@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 require 'rails_helper'
 
-RSpec.describe TablesArrangement, type: :model do
+RSpec.describe TablesArrangement do
   describe 'callbacks' do
     it 'assigns a name before creation' do
       expect(create(:tables_arrangement).name).to be_present
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 0277d58..ae4a2d5 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 require 'rails_helper'
 
-RSpec.describe User, type: :model do
+RSpec.describe User do
   pending "add some examples to (or delete) #{__FILE__}"
 end
diff --git a/spec/models/wedding_spec.rb b/spec/models/wedding_spec.rb
index 6ec8a3e..5664367 100644
--- a/spec/models/wedding_spec.rb
+++ b/spec/models/wedding_spec.rb
@@ -1,22 +1,25 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 require 'rails_helper'
 
-RSpec.describe Wedding, type: :model do
+RSpec.describe Wedding do
   describe 'validations' do
     subject { build(:wedding) }
-    describe 'slug' do
-      it { should allow_value('foo').for(:slug) }
-      it { should allow_value('foo-bar').for(:slug) }
-      it { should allow_value('foo-123').for(:slug) }
-      it { should allow_value('foo-123-').for(:slug) }
-      it { should allow_value('foo--123').for(:slug) }
 
-      it { should_not allow_value('Foo').for(:slug) }
-      it { should_not allow_value('/foo').for(:slug) }
-      it { should_not allow_value('foo/123').for(:slug) }
-      it { should_not allow_value('foo_123').for(:slug) }
-      it { should_not allow_value('foo/').for(:slug) }
+    describe 'slug' do
+      it { is_expected.to allow_value('foo').for(:slug) }
+      it { is_expected.to allow_value('foo-bar').for(:slug) }
+      it { is_expected.to allow_value('foo-123').for(:slug) }
+      it { is_expected.to allow_value('foo-123-').for(:slug) }
+      it { is_expected.to allow_value('foo--123').for(:slug) }
+
+      it { is_expected.not_to allow_value('Foo').for(:slug) }
+      it { is_expected.not_to allow_value('/foo').for(:slug) }
+      it { is_expected.not_to allow_value('foo/123').for(:slug) }
+      it { is_expected.not_to allow_value('foo_123').for(:slug) }
+      it { is_expected.not_to allow_value('foo/').for(:slug) }
     end
   end
 end