diff --git a/laravel/src/SyncApiCollection.php b/laravel/src/SyncApiCollection.php
index f1d53ff..500219b 100644
--- a/laravel/src/SyncApiCollection.php
+++ b/laravel/src/SyncApiCollection.php
@@ -54,7 +54,7 @@ public function __construct(
   public function withMediaCollection(
     string $name,
     int $syncCapabilities,
-    ?callable $onUpsertOrDelete,
+    ?callable $onUpsertOrDelete = null,
   ): SyncApiCollectionMediaCollection {
     $syncApiCollectionMediaCollection = new SyncApiCollectionMediaCollection(
       $this,
diff --git a/laravel/src/SyncApiCollectionInterface.php b/laravel/src/SyncApiCollectionInterface.php
index 3ee86d9..100cfb5 100644
--- a/laravel/src/SyncApiCollectionInterface.php
+++ b/laravel/src/SyncApiCollectionInterface.php
@@ -18,6 +18,6 @@ interface SyncApiCollectionInterface extends SyncApiInterface
   function withMediaCollection(
     string $name,
     int $syncCapabilities,
-    ?callable $onUpsertOrDelete,
+    ?callable $onUpsertOrDelete = null,
   ): SyncApiCollectionMediaCollection;
 }
diff --git a/laravel/src/SyncApiCollectionMediaCollection.php b/laravel/src/SyncApiCollectionMediaCollection.php
index 36ca683..fe7d164 100644
--- a/laravel/src/SyncApiCollectionMediaCollection.php
+++ b/laravel/src/SyncApiCollectionMediaCollection.php
@@ -70,7 +70,7 @@ public function __construct(
   public function withMediaCollection(
     string $name,
     int $syncCapabilities,
-    ?callable $onUpsertOrDelete,
+    ?callable $onUpsertOrDelete = null,
   ): SyncApiCollectionMediaCollection {
     return $this->syncApiCollection->withMediaCollection(
       $name,