diff --git a/lib/nulla/models/activity.ex b/lib/nulla/models/activity.ex
index 44e21bb..c69b2af 100644
--- a/lib/nulla/models/activity.ex
+++ b/lib/nulla/models/activity.ex
@@ -11,8 +11,8 @@ defmodule Nulla.Models.Activity do
     field :type, :string
     field :actor, :string
     field :object, :string
-    field :to, :string
-    field :cc, :string
+    field :to, {:array, :string}
+    field :cc, {:array, :string}
 
     timestamps()
   end
diff --git a/priv/repo/migrations/20250615131856_create_activities.exs b/priv/repo/migrations/20250615131856_create_activities.exs
index 9d95372..b21c662 100644
--- a/priv/repo/migrations/20250615131856_create_activities.exs
+++ b/priv/repo/migrations/20250615131856_create_activities.exs
@@ -8,8 +8,8 @@ defmodule Nulla.Repo.Migrations.CreateActivities do
       add :type, :string, null: false
       add :actor, :string, null: false
       add :object, :text, null: false
-      add :to, :text
-      add :cc, :text
+      add :to, {:array, :string}
+      add :cc, {:array, :string}
 
       timestamps()
     end