How to Upgrade an Old Laravel, React, Node.js or Mobile Application

Before touching any code, build an exact inventory: the specific version of each framework in use (not just 'Laravel' but a specific 8.x, not just 'Node' but a specific 16.x), every direct and indirect dependency and its version, and, critically, each of those versions' current support status according to its own vendor. This last part changes constantly and should always be checked live rather than assumed, since a version that was supported a year ago may not be today.

As one concrete reference point: Laravel's own release notes state that, under its current policy, every release receives eighteen months of bug fixes and two years of security fixes from its release date — meaning Laravel 10 (released February 2023) is fully past both windows, and Laravel 11 (released March 2024) passed its security-fix window in March 2026 (Laravel, Release Notes, laravel.com/docs/master/releases, checked 8 September 2026). Node.js publishes a similar schedule on its own end-of-life page, where, for example, Node 18 reached end-of-life in March 2025 and Node 20 in March 2026 — after which point a version stops receiving security fixes altogether (Node.js, End-of-Life, nodejs.org/en/about/eol, checked 8 September 2026).

Once the inventory shows which versions are behind, the next step is reading each framework's own official migration guidance for the specific versions involved — Laravel and Node.js both publish upgrade guides for each major release, and React publishes its own release notes and codemods for breaking changes between major versions. Generic 'how to upgrade' advice found elsewhere is a starting point at best; the authoritative list of breaking changes for a specific jump lives only in that framework's own documentation.

Imagine an education company running a school-management portal still on an old Laravel major version and a React frontend several majors behind, both originally built five years ago. Jumping straight to the latest Laravel and React releases in one move means absorbing several major versions' worth of breaking changes at once — official migration guides typically document changes version by version, which is the strongest signal that upgrading is meant to happen the same way: incrementally, not in a single leap.

Before any upgrade work begins, take a full, verified backup of both code and data, and confirm — by actually restoring it somewhere, not just by assuming the backup ran — that it can be recovered if something goes wrong. If the application has automated tests, run them against the current version first to establish a baseline of what 'working' looks like before anything changes; if it does not, this is the point to add at least basic tests around its most business-critical flows, since those tests become the main way to confirm the upgrade has not broken anything.

All of this work should happen in an environment isolated from production — a staging copy that mirrors production closely enough that what passes there is a reliable signal for what will happen in production, without any risk to the live system while the upgrade is in progress.

The safest sequence upgrades one major version at a time rather than jumping straight to the newest release, because each framework's migration guidance is written for exactly that kind of step, and skipping versions means skipping the documented guidance for the changes in between. After each version bump, run the test suite, exercise every integration the application depends on — payment gateways, SMS or email providers, third-party APIs — and manually check the areas most likely to be affected by that specific version's breaking changes.

For a mobile application, the same incremental logic applies to the OS-level SDKs and the app store's own minimum target requirements, alongside the framework itself — both major app stores periodically raise the minimum SDK version a submitted app must target, and that requirement should be checked directly against the current app store guidelines at the time of the upgrade, since it changes independently of the framework's own release schedule.

Once the upgraded version is fully validated in staging, release it in stages rather than all at once — to a small percentage of users or traffic first if the infrastructure supports it, or during a low-traffic window if it does not — with monitoring in place specifically to catch anything the staging tests did not.

Keep a clear, tested rollback path available for at least the first few days after release: the ability to redeploy the previous version quickly if monitoring surfaces a problem that staging missed. Only after the new version has run cleanly for a reasonable period should the previous version's supporting infrastructure be retired.