PrestaShop upgrade — safe, without breaking your e-commerce
Upgrading PrestaShop looks like a simple technical task. In reality, it is one of the most delicate moments in the life of an e-commerce: modules that stop working, broken checkout, broken theme, data at risk.
We handle PrestaShop upgrades and migrations on live e-commerce sites, always working on staging, with verified backups and a checklist built on 10+ years of real interventions. No standard solutions, no improvisation.
Upgrading PrestaShop looks easy. Often, it isn't.
On the official site and in many forums, PrestaShop upgrades are described as a few-clicks procedure: install the 1-Click Upgrade module, press a button, wait. In the reality of a live e-commerce — with real catalog, daily orders and modules built up over years — the upgrade touches dozens of interconnected components.
Every time we step in on a site that attempted the upgrade alone, we find the same pattern: modules that won't load, theme overrides skipped, PHP errors in the logs, checkout generating incomplete orders, lost translations or SEO. Issues that often aren't visible at first sight, and surface days later as a drop in conversions.
This page gives you a clear picture: how a PrestaShop upgrade really works, what can go wrong, when an upgrade makes sense and when a migration is the better choice, and how we handle it when you trust us with the operation.
How to upgrade PrestaShop: the essential steps
An overview of the technical steps. This is not an operational guide — it's here to show the real complexity behind each phase.
1. Full backup (files + database)
Before any operation, a full backup of files and database is required, stored on a separate location and tested for restore. Without a verified backup, nothing gets touched.
2. PHP and server compatibility check
Each PrestaShop version requires a specific PHP and MySQL/MariaDB range. PrestaShop 8 requires PHP 7.2-8.1, PrestaShop 9 requires PHP 8.1+. Upgrading without aligning the server is a frequent cause of 500 errors.
3. Module and theme compatibility
Module by module, override by override. Paid modules need active licenses for upgrade, custom modules need code review. Themes often require adjustments to the template engine (Smarty/Twig).
4. 1-Click Upgrade module or manual procedure
The official module automates many steps but isn't bulletproof, especially on big version jumps. A controlled manual procedure is often the safer route.
5. Maintenance mode and staging environment
Upgrades are never done in production. We replicate the site on a staging environment, run the upgrade there, test everything, and only then perform the switch.
6. End-to-end functional tests
Catalog, filters, search, registration, login, cart, checkout, payment, transactional emails, ERP and marketplace integrations, invoicing, SEO, redirects. Every flow is tested before going live.
What can go wrong during a PrestaShop upgrade
Real problems, on real sites. All solvable — but much more expensive to fix afterwards than to prevent.
Incompatible modules
Modules that won't install on the new version, hooks no longer triggered, features missing in the back office. Worst case: the carrier or payment module stops working and orders are blocked.
Broken or misaligned theme
Custom overrides no longer loaded, template files incompatible with the new Smarty/Twig version, broken layout, missing images. The site is online but visually unusable.
Broken checkout
One of the most serious and frequent issues: checkout looks fine but generates incomplete orders, doesn't send emails, doesn't talk to the ERP. You only notice days later, looking at the numbers.
Data loss or corruption
Database tables not migrated correctly, lost translations, language/currency configurations reset, tax rules to rebuild. Without backups, some data simply isn't recoverable.
Server errors (500, memory, timeout)
Incompatible PHP version, insufficient memory limits, missing extensions. The site responds with a 500 error and users can neither browse nor buy.
SEO issues and traffic loss
URLs changed without redirects, lost meta tags, outdated sitemap, overwritten robots.txt, broken structured data. The result shows up after a few weeks: dropping rankings and shrinking organic traffic.
PrestaShop upgrade or migration?
They are not the same thing. Understanding the difference saves you time, money and headaches.
Upgrade
The transition between close versions (e.g. from 1.7.8.x to 8.1, from 8.0 to 8.1, from 8 to 9). Database structure and code architecture stay broadly the same, so catalog, customers, orders and configurations are preserved.
When to choose it: the site is already on a recent PrestaShop version, theme and modules are still supported, performance is acceptable. You upgrade for security, PHP compatibility and new features.
Migration
Required when the version jump is too wide (e.g. from 1.6 to 8/9), or when the site is full of outdated customizations, abandoned modules and a non-upgradable theme. In practice, the site is rebuilt on the new version and data and content are imported.
When to choose it: old 1.6 or 1.7 versions, accumulated technical debt, obsolete theme. Often the right opportunity to also rebuild design, UX and SEO architecture.
In many real cases — especially on sites that started years ago on PrestaShop 1.6 — the right choice is not "upgrade at all costs", but to evaluate whether migrating to a modern version costs less and delivers more. It's a decision we make together after the technical analysis, never in advance.
How we handle a PrestaShop upgrade
A process built on 10+ years of work on real e-commerce sites. No phase skipped.
Initial site analysis
Full audit: current version, modules list (official, third-party, custom), theme and overrides, integrations, server configuration, traffic and orders. From this comes a concrete assessment of risks and timing.
Compatibility check
Module-by-module compatibility check against the target version. We identify what to upgrade, what to replace and what may need to be developed from scratch.
Staging environment replica
We clone the site on an environment identical to production. The full upgrade happens there, while the live site keeps selling normally.
Controlled upgrade
We run the upgrade (or migration) following a checklist: core update, modules, theme adaptation, overrides, translations. Each step is verified before moving to the next.
End-to-end functional tests
Tests on every critical flow: catalog navigation, search, registration, login, cart, checkout, real test-mode payments, transactional emails, ERP and marketplace integrations.
Go live
Switch from the old to the new version in a planned window, usually during low traffic. Maintenance mode is active only for the strictly necessary time.
Final checks and monitoring
Post-launch monitoring of errors, server logs, performance, conversions, emails. We stay on hand to handle any fixes in the hours and days right after the release.
What you get from a PrestaShop upgrade done right
Stronger security
Up-to-date security patches, protection against known vulnerabilities, compliance with payment and personal data regulations.
Better performance
Optimized code, support for faster PHP versions, reduced load times, improved user experience.
Guaranteed compatibility
Compatibility with modern modules, updated payment gateways, supported third-party libraries.
Long-term stability
A solid base on which to build new features without piling up technical debt, with lower maintenance costs.
How much does a PrestaShop upgrade cost
Be wary of anyone giving you a price before looking at the site. The cost of a PrestaShop upgrade depends on several variables, all concrete and measurable:
- Starting and target version (an upgrade from 1.7.8 to 8.1 is very different from a 1.6 to 9 migration).
- Number, type and quality of installed modules (official, marketplace, custom, abandoned).
- Theme or core customizations.
- Active integrations: ERP, marketplaces, carriers, electronic invoicing, BI.
- Catalog volume, customers, historical orders to migrate.
- Internal training needs on the new back office.
That's why the first step is always a technical analysis of your site. Only then can we give you a realistic quote, a timing estimate and a clear evaluation between upgrade and migration.
Why work with Zeno Web
Vertical PrestaShop expertise
Specialized team with 10+ years of work on PrestaShop: upgrades, migrations, custom development, complex integrations. It's not one platform among many — it's our core.
Tailored approach
No standard packages. Every project starts from analyzing your site, your ERP and your business. Technical choices follow your model, not the other way around.
Development + marketing integrated
A PrestaShop upgrade isn't only a technical matter: it impacts SEO, conversion rate, tracking, automation. We work with a team that sees the whole pipeline, not just the code.
Business continuity
Your e-commerce keeps selling throughout the entire process. We work on staging, communicate switch windows, monitor after release. No surprises.
Frequently asked questions on PrestaShop upgrade
How do you upgrade PrestaShop?
PrestaShop upgrades can be performed using the official 1-Click Upgrade module or manually via FTP/SSH. In both cases, a complete backup (files + database) is essential, work must start on a staging environment, and theme, custom modules and the server PHP version must be checked for compatibility. Skipping any of these steps is the main reason sites break after an update.
How much does it cost to upgrade PrestaShop?
There is no fixed price. The cost depends on the starting version (1.6, 1.7, 8.x), the number of installed modules, theme or core customizations, and active integrations (ERP, marketplaces, carriers). A minor upgrade on a clean site is very different from a migration from PrestaShop 1.6 to 8. We provide a quote only after the initial technical analysis.
Is there a risk of losing data when upgrading PrestaShop?
If the upgrade is performed correctly, no. The real risk appears when working directly in production, without a verified backup and without staging. We always work on a copy of the site, test the entire flow (catalog, orders, customers, checkout) and only after validation push the new version live.
Will my modules be compatible with the new version?
It depends. Official and actively maintained modules are regularly updated. Custom or unmaintained modules often need adjustments or replacement. Compatibility verification is one of the very first steps of our process, before touching PrestaShop itself.
How long does a PrestaShop upgrade take?
A minor upgrade can take a few days. A major migration (e.g. from 1.6 to 8) can take several weeks, especially with custom themes, ERP integrations and many modules. Testing and verification are often longer than the upgrade itself.
What is the difference between upgrade and migration?
An upgrade is the transition between close versions (e.g. from 1.7.8 to 8.1) and preserves structure and data. A migration is needed when the version gap is too wide (e.g. from 1.6 to 8): the site is essentially rebuilt on the new version, importing catalog, customers and orders. It is often a good opportunity to also rebuild the theme.
Can I keep selling during the upgrade?
Yes. Working on a staging environment keeps your live e-commerce online and operational. Maintenance mode is enabled only for the final switch window — usually a few hours, in low-traffic time slots.
What happens if I don't upgrade PrestaShop?
Outdated versions no longer receive security patches, are vulnerable to attacks, and may become incompatible with recent versions of PHP, MySQL and updated payment modules. In the medium term this means downtime risk, lost sales, and compliance issues (e.g. PSD2, GDPR).
Want to upgrade PrestaShop without taking risks?
We start from a technical analysis of your site: version, modules, theme, integrations. From there we tell you whether you need an upgrade or a migration, with clear timing and costs.