Upgrade Joomla 4 to Joomla 5 — Fast, Professional Migration

Joomla 4 reached its official end of life on 14 October 2025. Security support has ended, and no further patches will be released for the 4.x series. The good news: upgrading from Joomla 4 to Joomla 5 is the most straightforward migration path in the Joomla ecosystem. The two versions share the same architecture, and in many cases, the upgrade can be completed within days.

That does not mean the upgrade is risk-free. Extensions can break, custom code may need updating, server requirements must be verified, and your search rankings must be protected throughout the process. A professional migration ensures nothing falls through the cracks.

Get a Free Joomla 4 Compatibility Check →

Why Joomla 4 Must Be Upgraded

Joomla 4 served as the bridge between the legacy Joomla 3 era and the modern Joomla platform. It introduced the new administration interface, the modern MVC architecture, Bootstrap 5, PHP 8 support, and the foundation that Joomla 5 and 6 build upon. It was a vital release, but its time has passed.

End of Security Support

Since October 2025, Joomla 4 receives no security patches. Any vulnerability discovered in the Joomla codebase will be fixed in Joomla 5 and 6 only. The details of these vulnerabilities are published openly in the Joomla Security Centre, giving attackers a clear roadmap to exploit unpatched Joomla 4 installations.

Extension Developers Are Moving On

Extension developers prioritise current Joomla versions. Most major extension providers now focus their development and testing efforts on Joomla 5 and 6. While Joomla 4 extensions will continue to function for some time, they will receive fewer updates, less testing, and eventually no support at all. The extension that keeps your website secure today may quietly become the vulnerability that compromises it tomorrow.

PHP and Server Requirements

Joomla 4 supports PHP 7.2.5 through PHP 8.2. Joomla 5 requires PHP 8.1 at minimum, with PHP 8.2 or 8.3 recommended. If your hosting environment is already running PHP 8.1+, the server requirements for Joomla 5 are likely already met. If you are still on PHP 7.x, your hosting provider will eventually force an upgrade regardless — better to manage that transition as part of a planned Joomla upgrade than as an emergency response to a broken website.

GDPR and Regulatory Compliance

Running an end-of-life content management system is increasingly difficult to justify under GDPR's requirement for "appropriate technical measures" to protect personal data. If a data breach occurs on an unpatched Joomla 4 installation, the regulatory consequences can be significant. Upgrading to a supported version is the most fundamental technical measure you can take.

Why Joomla 4 to 5 Is the Easiest Upgrade

Unlike the Joomla 3 to 4 migration — which required crossing an architectural boundary and rebuilding extensions and templates — the Joomla 4 to 5 upgrade stays within the same architectural family. This makes it fundamentally different and significantly simpler.

Same Architecture

Joomla 4 and Joomla 5 share the same core architecture, the same MVC framework, the same template engine, and the same extension API patterns. Joomla 5 is best understood as a refined, improved version of Joomla 4 — not a rewrite. This means that extensions built for Joomla 4 generally work with Joomla 5, and templates designed for Joomla 4 are compatible with minimal or no changes.

Built-In Upgrade Path

Joomla 4 includes the Joomla Update component, which supports upgrading directly to Joomla 5. Unlike the Joomla 3 to 4/5 migration — which requires a multi-step process — the Joomla 4 to 5 upgrade can be performed through the standard update mechanism. The CMS itself is designed to handle this transition.

However, "can be performed" is not the same as "should be performed without preparation." The update component handles the Joomla core, but it does not verify extension compatibility, test custom code, or preserve your SEO configuration. These are the areas where professional expertise makes the difference between a smooth upgrade and a broken website.

Template Compatibility

Joomla 4 templates are largely compatible with Joomla 5. If your website uses the Cassiopeia default template or a commercial template from a reputable provider, there is a strong chance your template will work on Joomla 5 with minimal adjustments. Custom templates may need minor updates for deprecated features, but a complete template rebuild — which is necessary when migrating from Joomla 3 — is rarely required for a Joomla 4 to 5 upgrade.

Joomla 5 Is the LTS Release

Joomla 5.4 is the Long Term Support release, which means it will receive security patches and critical bug fixes for an extended period. By upgrading to Joomla 5, you are moving to the most stable version of the platform — a version that has been tested by hundreds of thousands of production websites and supported by a mature extension ecosystem.

What Changes Between Joomla 4 and Joomla 5

While the core architecture remains the same, Joomla 5 does introduce changes that need to be accounted for during the upgrade.

Deprecated Features Removed

Joomla 5 removes features that were deprecated in Joomla 4. This includes certain legacy APIs, outdated JavaScript libraries, and obsolete helper functions. Extensions that relied on these deprecated features will need to be updated. Well-maintained extensions from active developers have already addressed these changes, but older or abandoned extensions may break.

Database Requirements

Joomla 5 requires MySQL 8.0.13+ or MariaDB 10.4+, compared to Joomla 4's support for MySQL 5.6+. Most modern hosting environments meet this requirement, but older shared hosting accounts may need a database version upgrade. We verify this as part of our pre-upgrade audit.

PHP Version Requirements

Joomla 5 requires PHP 8.1 at minimum. If your Joomla 4 site is running on PHP 7.x, the PHP version must be upgraded alongside the Joomla upgrade. This is a routine change on most hosting platforms but needs to be coordinated to avoid downtime.

New Features Available

Joomla 5 introduces several features not available in Joomla 4:

Task scheduler: Automate recurring tasks such as cache clearing, session cleanup, and email notifications directly within Joomla.
Guided tours: Built-in interactive guides that help backend users learn the administration interface.
Improved custom fields: More flexible custom field types and better integration with content layouts.
Enhanced media manager: Improved file organisation, image editing, and media handling.
Child templates: Customise templates safely — your changes survive template updates without being overwritten.
Automatic core updates (in 5.4): Minor version security patches can be applied automatically.

Improved Performance

Joomla 5 includes performance optimisations in database queries, asset loading, and caching that result in measurably faster page load times compared to Joomla 4. These improvements are particularly noticeable on sites with large content volumes or complex extension configurations.

Our Upgrade Process

Even though the Joomla 4 to 5 upgrade is the simplest migration path, we follow the same disciplined methodology we use for all migrations. Professional handling eliminates the risks that make DIY upgrades dangerous.

Step 1: Pre-Upgrade Audit

We examine your Joomla 4 installation and verify server compatibility (PHP, MySQL, Apache/Nginx versions), extension compatibility (every installed component, module, and plugin checked against Joomla 5 requirements), template compatibility, custom code review, and current SEO baseline documentation.

Step 2: Staging Environment

A complete copy of your website is created in a staging environment. All upgrade work happens here — your live site continues operating normally throughout.

Step 3: Pre-Upgrade Updates

All extensions are updated to their latest Joomla 4 versions. Any extensions that have released Joomla 5 compatible versions are noted for immediate post-upgrade update. Unused or abandoned extensions are identified for removal.

Step 4: Core Upgrade

The Joomla core is upgraded from version 4.x to 5.4 (the current LTS release) through the standard update process. Database schema changes are applied automatically.

Step 5: Extension Updates

Each extension is updated to its Joomla 5 version and tested for correct functionality. Extensions without Joomla 5 support are replaced with compatible alternatives (with your approval) or removed if no longer needed.

Step 6: Template Verification

Your template is tested on Joomla 5. Minor adjustments are made for any deprecated features. If the template requires more significant updates, these are handled as part of the project.

Step 7: Testing

Comprehensive testing of every page, form, interactive element, and integration. Cross-browser and mobile testing. Performance benchmarking. SEO verification including redirects, metadata, and sitemap configuration.

Step 8: Your Review

You receive access to the staging site to review and test the upgrade yourself. We proceed to live deployment only after your approval.

Step 9: Live Deployment

The upgraded site replaces your live Joomla 4 installation. Scheduled during low-traffic hours, the switchover takes minutes. A complete backup of your Joomla 4 site is preserved.

Step 10: Post-Upgrade Monitoring

30 days of post-upgrade support included. We monitor the site, resolve any issues, and assist your team with any questions about changes in the Joomla 5 interface.

The Pitfalls That Catch DIY Upgrades

"Joomla 4 to 5 is easy" is true the way "driving is easy" is true — right up until the exceptions. The failures we are called in to untangle follow a pattern:

Deprecated code surviving in extensions. Joomla 5 removes compatibility scaffolding that Joomla 4 still tolerated. Extensions that were quietly relying on it work until the minute they do not — usually discovered as a white screen after a one-click update on the live site.
Template overrides frozen in time. Overrides copied from core years ago no longer match the layouts they override, producing broken markup, missing features, or accessibility regressions nobody connects to the upgrade.
The abandoned-extension discovery. The update screen shows no Joomla 5 version available — because the developer left the ecosystem in 2022 and nobody noticed. Now the upgrade includes a replacement project.
PHP moving at the same time. The Joomla upgrade and a PHP version jump interact; testing them together in staging is the only way to attribute what broke.
No rollback plan. The single most expensive omission. Our process never needs heroics because the staging-first, backup-verified sequence makes every step reversible.

None of this argues the upgrade is hard — it argues it deserves a process run by people who have met every one of these failure modes before, and built the checklist that catches them early. Ours has the pitfalls already mapped, which is precisely what you are paying a specialist for.

What You Gain on Joomla 5

Joomla 5 is not merely "Joomla 4 with support": you get measurably faster page delivery on modern PHP, passkey/WebAuthn logins for administrators, an improved task scheduler, better Dark Mode and accessibility in the admin, and a platform extension developers are actively targeting — meaning updates flow toward you instead of away. For most organisations the honest summary is: everything feels the same to visitors, slightly nicer to editors, and dramatically safer to own.

Timeline and Pricing

Most Joomla 4 to 5 upgrades are completed within one to two weeks from approval. Standard business websites with compatible extensions and templates can often be completed faster — the core upgrade itself takes hours, not days. The majority of project time is spent on thorough testing and verification.

Projects start from €600 for straightforward upgrades. Complex installations with custom extensions, e-commerce, or multi-language configurations are quoted based on the audit findings. All quotations are fixed-price.

Preparing for the Upgrade: Your Side of the Project

Your involvement is deliberately light, but three contributions make every upgrade smoother. First, access: hosting control panel, FTP/database, and a Joomla Super User account — gathered at the start so the project never stalls waiting for a password. Second, knowledge: anything you know about who built the site, which extensions matter commercially, and which features your team genuinely uses (the audit verifies everything, but your context speeds the triage). Third, a reviewer: one person on your side empowered to click through the staging site and say "approved" — review by committee is the single most common cause of upgrade projects drifting past their timeline.

When to schedule it

Pick your quiet season, not your busy one — the live switch itself is brief, but you want calm days around it for review and the post-deployment monitoring window. Avoid scheduling the upgrade simultaneously with a redesign launch, a marketing campaign, or a hosting change you are running independently; stacking variables makes any issue harder to attribute. And do not wait for a mythical perfectly quiet month: with Joomla 4 past end of life, the calendar risk of waiting now exceeds the convenience of timing. Most clients are reviewing their staging site within two weeks of saying go.

The Rollback Discipline

The most important property of a professional upgrade is one you should never see used: at every point before the final switch, the whole project can be abandoned with zero consequence to your live site, and even the switch itself is reversible. Concretely, that means verified full backups taken before anything begins (and test-restored, because an unverified backup is a hope, not a plan); all work confined to staging until your approval; the production deployment performed as a controlled, snapshotted step; and the pre-upgrade state retained until the post-deployment monitoring window closes cleanly. If anything unexpected surfaces in those first days, restoring the previous state is minutes of routine, not a crisis call.

This discipline is also the honest answer to "what if something goes wrong?" — something occasionally does, on any software project anywhere; the difference between an anecdote and a disaster is whether the path backwards was built before the path forwards was attempted. Ours always is.

Joomla 5 or Joomla 6?

If you are upgrading from Joomla 4, you can target either Joomla 5 or Joomla 6. Joomla 5 is the stable, proven LTS choice. Joomla 6 is the latest release with the newest features but a less mature extension ecosystem.

For most organisations upgrading from Joomla 4, we recommend Joomla 5 as the initial target. You can then plan a future upgrade from Joomla 5 to Joomla 6 at your own pace, once the Joomla 6 extension ecosystem has fully matured. If you prefer to go directly to Joomla 6, we offer that service as well — read about our Joomla 4 to 6 migration.

Frequently Asked Questions

Can I upgrade Joomla 4 to 5 myself?

Technically, yes — Joomla 4 includes a built-in update component that supports the upgrade to Joomla 5. However, the update component only handles the core files. It does not verify extension compatibility, test custom code, check server requirements, or preserve SEO configuration. A failed upgrade on a live site can result in downtime, data loss, or broken functionality that takes longer to fix than a professional migration would have taken. We recommend professional handling to eliminate these risks.

Will my Joomla 4 template work on Joomla 5?

In most cases, yes. Joomla 4 and 5 share the same template framework and Bootstrap 5 foundation. Commercial templates from active developers typically support both versions. Custom templates may need minor adjustments for deprecated features. We verify template compatibility during the pre-upgrade audit.

How long will Joomla 5 be supported?

Joomla 5.4 is the Long Term Support release and will receive security updates for an extended period. It is the most stable and long-supported version currently available. The exact support end date is determined by the Joomla Project's release roadmap, but LTS releases historically receive several years of security support.

What is the difference between upgrading and migrating?

An upgrade applies the new version to your existing installation, preserving your database, content, and configuration. A migration involves installing a fresh copy of the new version and transferring data from the old installation. Joomla 4 to 5 is an upgrade — the simplest and fastest process. Joomla 3 to 5 requires a migration because the underlying architecture changed.

Do I need to change my hosting?

Not necessarily. If your current hosting supports PHP 8.1+ and MySQL 8.0+, it meets Joomla 5's requirements. We verify this during the audit. If your hosting needs upgrades, we can recommend options or migrate your site to our managed European hosting.

How much notice does the final switch-over need?

Almost none from your side — once you have approved the staging site, we agree a deployment slot (typically a low-traffic hour), and the switch itself is brief. Your team's only task around it is to pause content editing for the short deployment window so nothing is written to the old database mid-move; we tell you exactly when that window opens and closes. Visitors experience no downtime worth the name.

We have staging hosting already — can you use our environment?

Yes, if it genuinely mirrors production (same PHP version, same database engine, same configuration). Where it does not, we provide the staging environment ourselves — an inaccurate staging copy is worse than none, because it produces confident test results that do not transfer to the live server.

Our Joomla 4 site was never really finished or maintained. Upgrade anyway?

Yes — and the pre-upgrade audit is where the neglect gets handled. Outstanding updates, abandoned extensions, and configuration debt are resolved as part of bringing the site to upgrade-ready state, so what lands on Joomla 5 is healthy, not just newer. Pair it with a maintenance plan and the neglect cycle ends here.

Is there any reason to wait?

With Joomla 4 past end of life, waiting has a price measured in unpatched vulnerabilities. The one legitimate strategic question is target version — 5 now versus straight to 6 — and that is a planning conversation, not a reason to remain exposed. The audit settles it with facts about your specific extension stack.

Start Your Joomla 4 to 5 Upgrade

A Joomla 4 to 5 upgrade is the fastest way to get your website back onto a supported, secure platform. Our free compatibility check examines your installation and confirms whether a straightforward upgrade is possible, or whether specific extensions or configurations need attention first.

Get Your Free Compatibility Check →

Weighing up your options?

If you run a Joomla site, you have three honest paths - and we can help with any of them. Keep it: a good Joomla site is often best kept, and we handle the upgrades, security, hosting and maintenance that keep it safe and current. Upgrade it: if you are on an older version, we bring it up to modern, supported Joomla. Or move it: if you would rather stop maintaining a CMS altogether, our own CMS Pros Platform gives you a site you own, found by Google and AI, with security, updates, EU hosting and backups handled for you. Read the honest, no-pressure guide to your Joomla options, see how a move to the platform works, or ask for a free audit and we will tell you which path genuinely fits.