diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 16e72bb..1118afa 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -3,10 +3,13 @@ on:
   push:
     branches:
       - main
-  pull_request:
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   build-static-assets:
     runs-on: ubuntu-latest
+    timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
         with:
diff --git a/.github/workflows/copyright_notice.yml b/.github/workflows/copyright_notice.yml
index c97e035..35d8b8d 100644
--- a/.github/workflows/copyright_notice.yml
+++ b/.github/workflows/copyright_notice.yml
@@ -3,6 +3,9 @@ on:
   pull_request:
 permissions:
   contents: write
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   copyright_notice:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e4d4fec..9f2572f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -4,6 +4,9 @@ on:
     branches:
       - main
   pull_request:
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   unit_tests:
     runs-on: ubuntu-latest
diff --git a/app/serializers/serializable_guest.rb b/app/serializers/serializable_guest.rb
index b8d9347..d711d03 100644
--- a/app/serializers/serializable_guest.rb
+++ b/app/serializers/serializable_guest.rb
@@ -3,7 +3,7 @@
 class SerializableGuest < JSONAPI::Serializable::Resource
   type 'guest'
 
-  attributes :id, :email, :group_id, :status
+  attributes :id, :group_id, :status
 
   attribute :name do
     "#{@object.first_name} #{@object.last_name}"
diff --git a/db/migrate/20241103093955_remove_email_from_guests.rb b/db/migrate/20241103093955_remove_email_from_guests.rb
new file mode 100644
index 0000000..26ca939
--- /dev/null
+++ b/db/migrate/20241103093955_remove_email_from_guests.rb
@@ -0,0 +1,7 @@
+# Copyright (C) 2024 Manuel Bustillo
+
+class RemoveEmailFromGuests < ActiveRecord::Migration[7.2]
+  def change
+    remove_column :guests, :email, :string
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index c4f1c20..a300416 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -12,7 +12,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.2].define(version: 2024_11_03_075705) do
+ActiveRecord::Schema[7.2].define(version: 2024_11_03_093955) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -42,7 +42,6 @@ ActiveRecord::Schema[7.2].define(version: 2024_11_03_075705) do
   create_table "guests", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
     t.string "first_name"
     t.string "last_name"
-    t.string "email"
     t.string "phone"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
diff --git a/db/seeds.rb b/db/seeds.rb
index 71b2a31..ec78d0c 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -58,7 +58,6 @@ NUMBER_OF_GUESTS.times do
   Guest.create!(
     first_name: Faker::Name.first_name,
     last_name: Faker::Name.last_name,
-    email: Faker::Internet.email,
     phone: Faker::PhoneNumber.cell_phone,
     group: groups.sample,
     status: Guest.statuses.keys.sample
diff --git a/spec/factories/guest.rb b/spec/factories/guest.rb
index 688cdea..2637fb4 100644
--- a/spec/factories/guest.rb
+++ b/spec/factories/guest.rb
@@ -6,7 +6,6 @@ FactoryBot.define do
 
     first_name { Faker::Name.first_name }
     last_name { Faker::Name.last_name }
-    email { Faker::Internet.email }
     phone { Faker::PhoneNumber.cell_phone }
   end
 end