php - Laravel 5.1 Update message but it touch both created_at and updated_at -

as title, after update message using code below:

$id = 1; $message ="updated"; post::where(['id' => $id])->update(['message' => $message]); 

both created_at , updated_at change current timestamp.

how make update timestamp updated_at , dont update timestamp @ created_at when using update?

thanks

your created_at column set auto-updated.