Custom development does not always break during an Odoo upgrade, but it depends on how the custom modules were built. Well-planned Odoo development services follow Odoo's best practices, making upgrades smoother and reducing the need for major changes. Experienced Odoo developers create custom modules that are easy to maintain and compatible with future Odoo versions whenever possible. Before upgrading, they review existing customisations, test all modules, and update any features affected by changes in the new version. This helps reduce downtime and ensures your business continues to run without interruptions. A skilled Odoo ERP developer also checks third-party integrations, reports, workflows, and custom applications to make sure everything works correctly after the upgrade. Any required improvements are completed during the migration process, helping your ERP system remain stable and secure. If you hire Odoo developer professionals for your upgrade project, they will handle compatibility checks, module updates, data migration, testing, and post-upgrade support. This ensures your customised Odoo ERP continues to perform efficiently while allowing your business to benefit from the latest Odoo features, security updates, and performance improvements.