Migration generate VARCHAR column types in place of DATE ones

Using Phalcon Devtools 2.0.7 with MySql adapter. MySql Server version: 5.7.9.

The problem impacts on all TIMESTAMP, DATE and DATETIME columns.

Running:

phalcon migration generate --config='.phalcon/config.ini' --migrations='migrations'

Generates this code:

/* ... */

new Column(
    'date_updated',
    array(
        'type' => Column::TYPE_VARCHAR,
        'size' => 1,
        'after' => 'user_id_updated'
    )
),

/* ... */

The correct type should not be Column::TYPE_VARCHAR. It should be Column::TYPE_TIMESTAMP, Column::TYPE_DATE or Column::TYPE_DATETIME.

How can I fix this?