cannot drop column needed in a foreign key constraint laravel code example

Example 1: larael drop foreign key

Schema::table('posts', function (Blueprint $table) {
	$table->dropForeign(['category_id']);
});

Example 2: laravel drop foreign column

// Searched, laravel drop foreign column
Schema::table('users', function (Blueprint $table) {
    $table->dropColumn(['votes', 'avatar', 'location']);
});