Framework: Erreur lors de la modification du type de colonne en json

Je ne sais pas s'il s'agit d'un bogue, mais le changement d'un type de colonne de varchar à json entraîne l'erreur suivante :

Schema::table('fields', function (Blueprint $table) {
    $table->json('label')->change();
});

  [Doctrine\DBAL\DBALException]
  Unknown column type "json" requested. Any Doctrine type that you use has to be registered
  with \Doctrine\DBAL\Types\Type::addType(). You can get a list of all the known types with
  \Doctrine\DBAL\Types\Type::getTypesMap(). If this error occurs during database introspecti
  on then you might have forgot to register all database types for a Doctrine Type. Use Abst
  ractPlatform#registerDoctrineTypeMapping() or have your custom types implement Type#getMap
  pedDatabaseTypes(). If the type name is empty you might have a problem with the cache or f
  orgot some mapping information.

Utiliser $table->text('label')->change(); la place ?