diff --git a/priv/repo/migrations/20251127222831_modify_users_event_categories.exs b/priv/repo/migrations/20251127222831_modify_users_event_categories.exs
new file mode 100644
index 0000000..1665d8f
--- /dev/null
+++ b/priv/repo/migrations/20251127222831_modify_users_event_categories.exs
@@ -0,0 +1,17 @@
+defmodule Atlas.Repo.Migrations.ModifyEvents do
+  use Ecto.Migration
+
+  def change do
+    alter table(:events) do
+      modify :category_id,
+             references(:event_categories, on_delete: :delete_all, type: :binary_id),
+             from: references(:event_categories, on_delete: :nothing, type: :binary_id)
+    end
+
+    alter table(:users_event_categories) do
+      modify :event_category_id,
+             references(:event_categories, on_delete: :delete_all, type: :binary_id),
+             from: references(:event_categories, on_delete: :nothing, type: :binary_id)
+    end
+  end
+end