diff --git a/publishable/database/dummy_seeds/PagesTableSeeder.php b/publishable/database/dummy_seeds/PagesTableSeeder.php
index <HASH>..<HASH> 100644
--- a/publishable/database/dummy_seeds/PagesTableSeeder.php
+++ b/publishable/database/dummy_seeds/PagesTableSeeder.php
@@ -129,6 +129,9 @@ class PagesTableSeeder extends Seeder
                     'slugify' => [
                         'origin' => 'title',
                     ],
+                    'validation' => [
+                        'rule'  => 'unique:pages,slug',
+                    ],
                 ]),
                 'order' => 6,
             ])->save();
diff --git a/publishable/database/dummy_seeds/PostsTableSeeder.php b/publishable/database/dummy_seeds/PostsTableSeeder.php
index <HASH>..<HASH> 100644
--- a/publishable/database/dummy_seeds/PostsTableSeeder.php
+++ b/publishable/database/dummy_seeds/PostsTableSeeder.php
@@ -185,6 +185,9 @@ class PostsTableSeeder extends Seeder
                         'origin'      => 'title',
                         'forceUpdate' => true,
                     ],
+                    'validation' => [
+                        'rule'  => 'unique:posts,slug',
+                    ],
                 ]),
                 'order' => 8,
             ])->save();
Unique slug rule for posts/pages

Fixes #<I>