diff --git a/app/models/communication/website/author.rb b/app/models/communication/website/author.rb
index a81414d3d43dd521f43c9f78d1275aa91afed90e..b60581dae8ba540fcb9487d1aa70b89bb795feb2 100644
--- a/app/models/communication/website/author.rb
+++ b/app/models/communication/website/author.rb
@@ -39,6 +39,8 @@ class Communication::Website::Author < ApplicationRecord
            class_name: 'Communication::Website::Post',
            dependent: :nullify
 
+  validates :slug, uniqueness: { scope: :communication_website_id }
+
   scope :ordered, -> { order(:last_name, :first_name) }
 
   def to_s
diff --git a/app/models/communication/website/category.rb b/app/models/communication/website/category.rb
index 5d662a5c3ed5e42ae298a44c315a541a4422e75e..3ae309ba9063d4255ac17e20342d5fb176a2de5c 100644
--- a/app/models/communication/website/category.rb
+++ b/app/models/communication/website/category.rb
@@ -57,8 +57,8 @@ class Communication::Website::Category < ApplicationRecord
                           foreign_key: 'communication_website_category_id',
                           association_foreign_key: 'communication_website_post_id'
 
-
   validates :name, presence: true
+  validates :slug, uniqueness: { scope: :communication_website_id }
 
   scope :ordered, -> { order(:position) }
 
diff --git a/app/models/communication/website/page.rb b/app/models/communication/website/page.rb
index 5e7b1f45b56247773cfd420db7338f51bf9a7459..2fd61295749cf40dff6242d1422752969172588c 100644
--- a/app/models/communication/website/page.rb
+++ b/app/models/communication/website/page.rb
@@ -63,8 +63,9 @@ class Communication::Website::Page < ApplicationRecord
              dependent: :nullify
 
   validates :title, presence: true
+  validates :slug, uniqueness: { scope: :communication_website_id }
 
-  before_validation :make_path
+  before_validation :regenerate_slug, :make_path
   after_save :update_children_paths if :saved_change_to_path?
 
   scope :ordered, -> { order(:position) }
@@ -92,6 +93,15 @@ class Communication::Website::Page < ApplicationRecord
 
   protected
 
+  def regenerate_slug
+    current_slug = self.slug
+    n = 0
+    while self.class.unscoped.where(communication_website_id: communication_website_id, slug: self.slug).where.not(id: id).exists?
+      n += 1
+      self.slug = [current_slug, n].join('-')
+    end
+  end
+
   def make_path
     self.path = "#{parent&.path}/#{slug}".gsub('//', '/')
   end
diff --git a/app/models/communication/website/post.rb b/app/models/communication/website/post.rb
index 51bbcec9b443d3d09c5be483adb9ddd3f48e2088..b689d7c9c56319ca6668973d11007f6db973ef03 100644
--- a/app/models/communication/website/post.rb
+++ b/app/models/communication/website/post.rb
@@ -53,6 +53,7 @@ class Communication::Website::Post < ApplicationRecord
   scope :recent, -> { order(published_at: :desc).limit(5) }
 
   validates :title, presence: true
+  validates :slug, uniqueness: { scope: :communication_website_id }
 
   def github_path_generated
     "_posts/#{published_at.year}/#{published_at.strftime "%Y-%m-%d"}-#{slug}.html"