Bamboo 2.5.3 Upgrade Guide
Upgrading from Bamboo 2.5.2 to 2.5.3
Please follow the Bamboo upgrade guide.
No additional upgrade tasks are required to upgrade from Bamboo 2.5.2 to 2.5.3.
Upgrading from Bamboo 2.4.x or earlier
In addition to the above, please read the Bamboo 2.5 Upgrade Guide and the Upgrade Guide for every version you are skipping during the upgrade.