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This wiki page is an amendment to the section "Upgrade" in the Installation and Upgrade Guide. The guide contains the general upgrade information, which you should follow. This wiki page holds additions to this information for the upgrade to a specific version.
Read the Release notes
You should not only go through the upgrade notes, which this page has for the version, to which you are updating, but also the notes for any intermediate versions, as these might also contain instructions you should follow.
You should also read the Release Notes of the main versions you go through when updating (e.g. 6.2.0 and 7.6.0). These documents contain a section called "Upgrading", which you should follow. See list of all see https://get.typo3.org.
Upgrading to 7.6 Long Term Support
Information specific to upgrading to 7.6 LTS has been migrated to Installation and Upgrade Guide: Upgrade
Upgrading to 8.7 Long Term Support
Information specific to upgrading to 8.7 LTS has been migrated to Installation and Upgrade Guide: Upgrade
Upgrading to 9.5 Long Term Support
Information specific to upgrading to 9.5 LTS has been migrated to Installation and Upgrade Guide: Upgrade
Upgrading to 10.4
Information specific to upgrading to 10.x has been migrated to Installation and Upgrade Guide: Upgrade