Keeping WordPress updated closes the security holes attackers look for, keeps forms and checkouts working as browsers and PHP change, and keeps the site fast. Test each update before it goes live, because an untested update can break a site as surely as a missed one.
Most WordPress problems I’m asked to fix start with something simple: an update that never happened, or one that ran without being tested. If your site brings in enquiries, sales or bookings, updates are part of running it.
What each kind of update does
WordPress updates come in three kinds: core, plugins and themes.
Core updates fix security flaws, improve performance and keep WordPress working with newer versions of PHP. Plugin updates fix bugs, close security holes and keep features working as browsers and PHP change. Theme updates keep the site displaying correctly as WordPress changes.
Skipping them leaves the site open to more each month.
The risk of an out-of-date site
Attackers move fast once a weakness is public. Patchstack found that about half of the high-impact WordPress vulnerabilities reported in 2025 were exploited within 24 hours, and 91% of all new vulnerabilities were in plugins (Patchstack, State of WordPress Security in 2026). Most attacks aren’t aimed at anyone in particular.
Bots scan the web for sites running a plugin or core version with a known flaw, and attack any they find, often with no visible sign.
Out-of-date sites also suffer from:
- Broken contact forms or checkout flows
- Poor performance after server upgrades
- Incompatibility with modern browsers
- Subtle layout issues that harm trust
If your site brings in leads, even a small failure can lose enquiries you never knew about.
Why clicking update isn’t enough
The risk is in updates nobody tests. Many WordPress sites run on a mix of plugins, custom code and third-party services, and an untested update can easily cause a conflict between them.
Common examples include:
- A plugin update breaking a bespoke feature
- A theme update overriding custom styling
- A PHP version change exposing hidden errors
- Caching or optimisation plugins behaving differently
That’s why untested updates so often end in a call that starts “the site was fine yesterday”.
Testing every update
Good WordPress maintenance controls each change, rather than updating for the sake of it. A sound update process includes:
- Reading what’s being updated, and why
- Applying updates on a staging copy first, where possible
- Testing what visitors do most: forms, payments and logins
- Checking performance and error logs
- Confirming there’s a backup before and after
Updates and speed
Updates also help keep the site fast. WordPress releases often improve database queries, the editor, and how WordPress works with caching and CDNs. Out-of-date plugins are a common reason a site feels slow, even on good hosting.
Maintenance before something breaks
Many businesses look for WordPress maintenance only after something goes wrong, when the fix costs more and the pressure is on. Regular maintenance replaces emergency fixes with routine work, and you can see what was done and what was found. In regulated industries such as financial services, it also protects client trust and professional standing.
Working with me
Before you compare providers, read what a WordPress care plan should include. I look after WordPress sites for businesses in Cheshire, and test each update before it goes live. The WordPress maintenance page sets out what the cover can include.
Published , updated .
Part 4 of The Long Game.