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Upgrading Instructions for Yii Framework v2 =========================================== !!!IMPORTANT!!! The following upgrading instructions are cumulative. That is, if you want to upgrade from version A to version C and there is version B between A and C, you need to following the instructions for both A and B. Upgrade from 'yii2-swiftmailer' 2.0.7 ------------------------------------- * Minimal required version of the [swiftmailer/swiftmailer](https://github.com/swiftmailer/swiftmailer) library has been raised to 6.0.0. You should adjust your program according to the [change list](https://github.com/swiftmailer/swiftmailer/blob/v6.0.0/CHANGES#L4-L17) for this version. * Since `Swift_MailTransport` has been removed in SwiftMailer 6.0.0, this extension now uses `Swift_SendmailTransport` by default. * Minimum version of PHP has been raised to 7.0.