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# How to Upgrade Your ownCloud Server

There are three ways to upgrade your ownCloud server:

- Using your Linux package manager with our official ownCloud repositories. This is the recommended method.
- With the Updater App (Server Edition only). Recommended for shared hosters, and for users who want an easy way to track different release channels. (It is not available and not supported on the Enterprise edition.)
- Manually upgrading with the ownCloud `.tar` archive from owncloud.org/install/.
- Manually upgrading is also an option for users on shared hosting; download and unpack the ownCloud tarball to your PC. Delete your existing ownCloud files, except `data/` and `config/` files, on your hosting account. Then transfer the new ownCloud files to your hosting account, again preserving your existing `data/` and `config/` files.
- Enterprise customers will use their Enterprise software repositories to maintain their ownCloud servers, rather than the Open Build Service. Please see Installing & Upgrading ownCloud Enterprise Edition for more information.

Warning

When upgrading from oC 9.0 to 9.1 with existing Calendars or Adressbooks please have a look at the ownCloud 9.1 Release Notes of oC 9.0 for important info about the needed migration steps during that upgrade.

When an update is available for your ownCloud server, you will see a notification at the top of your ownCloud Web interface. When you click the notification it brings you here, to this page.

It is best to keep your ownCloud server upgraded regularly, and to install all point releases and major releases without skipping any of them, as skipping releases increases the risk of errors. Major releases are 8.0, 8.1, 8.2, and 9.0. Point releases are intermediate releases for each major release. For example, 8.0.9 and 8.1.3 are point releases. Skipping major releases is not supported.

Upgrading is disruptive. Your ownCloud server will be put into maintenance mode, so your users will be locked out until the upgrade is completed. Large installations may take several hours to complete the upgrade.

Warning

Downgrading is not supported and risks corrupting your data! If you want to revert to an older ownCloud version, make a new, fresh installation and then restore your data from backup. Before doing this, file a support ticket (if you have paid support) or ask for help in the ownCloud forums to see if your issue can be resolved without downgrading.

## Prerequisites

You should always maintain regular backups and make a fresh backup before every upgrade.

Then review third-party apps, if you have any, for compatibility with the new ownCloud release. Any apps that are not developed by ownCloud show a 3rd party designation. Install unsupported apps at your own risk. Then, before the upgrade, all 3rd party apps must be disabled. After the upgrade is complete you may re-enable them.

## Previous ownCloud Releases

You’ll find previous ownCloud releases in the ownCloud Server Changelog.

## Reverse Upgrade

If you need to reverse your upgrade, see Restoring ownCloud.

## Troubleshooting

When upgrading ownCloud and you are running MySQL or MariaDB with binary logging enabled, your upgrade may fail with these errors in your MySQL/MariaDB log:

    An unhandled exception has been thrown:
    exception 'PDOException' with message 'SQLSTATE[HY000]: General error: 1665
    Cannot execute statement: impossible to write to binary log since
    BINLOG_FORMAT = STATEMENT and at least one table uses a storage engine limited
    to row-based logging. InnoDB is limited to row-logging when transaction
    isolation level is READ COMMITTED or READ UNCOMMITTED.'

Please refer to MySQL / MariaDB with Binary Logging Enabled on how to correctly configure your environment.

Occasionally, files do not show up after a upgrade. A rescan of the files can help:

    sudo -u www-data php console.php files:scan --all

See the owncloud.org support page for further resources for both home and enterprise users.

Sometimes, ownCloud can get stuck in a upgrade. This is usually due to the process taking too long and encountering a PHP time-out. Stop the upgrade process this way:

    sudo -u www-data php occ maintenance:mode --off

Then start the manual process:

    sudo -u www-data php occ upgrade

If this does not work properly, try the repair function:

    sudo -u www-data php occ maintenance:repair

## Migration Test

Before completing the upgrade, ownCloud first runs a simulation by copying all database tables to new tables, and then performs the upgrade on them, to ensure that the upgrade will complete correctly. The copied tables are deleted after the upgrade. This takes twice as much time, which on large installations can be many hours, so you can omit this step (by risking a failed upgrade) with the `--skip-migration-test` option, like this example on CentOS:

    $ sudo -u apache php occ upgrade --skip-migration-test

or this example on Ubuntu:

    $ sudo -u www-data php occ upgrade --skip-migration-test

See Using the occ Command to learn more.

## Encryption migration from oC 7.0 to 8.0 and 8.0 to 8.1

The encryption backend was changed twice between ownCloud 7.0 and 8.0 as well as between 8.0 and 8.1. If you’re upgrading from these older versions please refer to Encryption migration to ownCloud 8.0 for the needed migration steps.

## Debian Migration to Official ownCloud Packages

As of March 2016 Debian will not include ownCloud packages. Debian users can migrate to the official ownCloud packages by following this guide, Upgrading ownCloud on Debian Stable to official packages.

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