Themes are the part of WordPress that often gets the least update attention. People update plugins. They update WordPress core. The theme update notification sits in the admin for months because nobody is sure if updating will break their design.
That hesitation has real costs. Themes have security vulnerabilities too. Themes need to keep up with WordPress core changes. Themes get bug fixes that improve the user experience. Skipping theme updates eventually creates problems.
This piece covers why theme updates matter, how to update without losing customizations, what to do when updates break things, and how to keep your theme strategy healthy long-term.
Why Theme Updates Matter
Themes are not just visual styling. They contain real code that affects security, performance, and functionality.
Security Fixes
Themes can have security vulnerabilities. Cross-site scripting, file inclusion issues, authentication bypasses. These show up in themes the same way they show up in plugins.
When a theme vulnerability is announced, sites running the vulnerable version get attacked. Theme updates that fix security issues need to be applied promptly.
WordPress Compatibility
Themes need to work with the WordPress version running underneath. When WordPress core updates, themes sometimes need updates to remain compatible.
A theme that was perfect a year ago may have issues with current WordPress. Theme updates address these compatibility problems.
PHP Compatibility
Hosts update PHP versions. Old themes may not work on new PHP versions. Theme updates keep up with PHP changes.
Bug Fixes
Themes have bugs. The developer finds them or users report them. Updates fix the issues over time. Skipping updates means living with bugs that have been fixed.
Block Editor & New Features
WordPress has introduced major new editing capabilities over recent years. The Block Editor (Gutenberg) and Full Site Editing changed how themes work. Theme updates add support for these features.
Sites running old themes miss out on the modern editing experience.
Performance Improvements
Themes can be optimized over time. Better code, smaller assets, fewer database queries. Updates often include performance improvements.
The Big Concern: Losing Customizations
The reason most people skip theme updates is fear of losing customizations.
Why Customizations Get Lost
Themes are made up of PHP, CSS, and JavaScript files. When you update a theme, the old files get replaced with new ones. If you modified the theme files directly, your modifications get wiped out.
This is the most common reason theme updates cause problems. People customize themes by editing the files, then lose the work when they update.
The Solution: Child Themes
The right way to customize WordPress themes is with a child theme. A child theme inherits from a parent theme but lives in its own directory. Your customizations go in the child theme. When the parent theme updates, your customizations stay safe.
If you have not set up a child theme but want to customize, set one up before making changes. The setup is a few minutes of work and saves you from this problem permanently.
Custom CSS Through Customizer
For simple visual changes, the WordPress Customizer (Appearance > Customize > Additional CSS) lets you add CSS without touching theme files. This CSS survives theme updates.
For minor changes, this is easier than setting up a child theme.
Plugins for Custom Code
For PHP customizations, plugins like Code Snippets let you add custom code without modifying theme files. The code lives in the plugin’s storage, not in the theme. Updates do not affect it.
This approach is good for small additions. For larger customizations, a child theme is still the right choice.
How to Update Themes Safely
A careful process prevents problems.
Identify Your Customization Approach
Before updating, know how the theme is customized. Direct file edits? Child theme? Custom CSS through customizer? Code snippets plugin?
The customization approach determines how much risk the update brings.
If You Have a Child Theme
Updating is straightforward. The parent theme gets updated. The child theme stays untouched. Your customizations survive.
Test after the update to make sure everything still looks right. Sometimes parent theme changes affect how child theme code behaves.
If You Have Customizer or Snippet Plugin Code
These customizations are stored separately from theme files. They survive updates. Update the theme and your custom code remains.
Still test after the update to confirm nothing broke.
If You Have Direct File Edits
This is the risky case. Direct file edits will be lost when the theme updates.
Before updating, document every customization. Note which files were edited and what changes were made. Either:
Set up a child theme and move the customizations there before updating.
Use the Customizer or a snippet plugin for the customizations.
Make the changes again manually after updating.
The first option is the right long-term answer.
Make a Backup
Even with customizations safely separated, back up before updating. Updates can fail in other ways. The backup is insurance.
Test on Staging
For business sites, test theme updates on staging before production. Themes can affect how content displays, how forms work, how the navigation behaves. Catching issues on staging is much better than catching them on production.
Update & Verify
Apply the update. Check that the site still looks correct. Check key pages: home, about, contact, product pages, blog. Test functionality that depends on theme behavior.
Watch for a Few Days
Sometimes theme update issues do not appear immediately. Customer reports of weird behavior, broken layouts, or other issues may come in over the next few days. Watch your support channels.
Common Theme Update Problems
A few patterns of problems come up regularly.
Layout Looks Different
The update may have included CSS changes that affect how things look. Sometimes the changes are improvements. Sometimes they break your specific layout.
To fix: Look at what changed in the update. Add custom CSS to revert specific changes if needed. Or accept the new look if it is reasonable.
Custom Code Stops Working
If you have custom code that depends on theme hooks or functions, the update may have changed how those work.
To fix: Review your custom code against the theme changes. Update the code to match the new theme version. This is exactly the case for keeping customizations in a child theme where they are easy to manage.
Theme Won’t Update
Sometimes the update process fails. The theme stays on the old version.
To fix: Check the host’s file permissions. Try updating manually by uploading the new theme files via SFTP. Or contact the theme developer for help.
Site Breaks Completely
A worst-case scenario where the theme update breaks the entire site.
To fix: Restore from your backup. Or switch to a default WordPress theme temporarily to get the site back up. From there, troubleshoot what went wrong.
When Your Theme Is Abandoned
A particular challenge is when the theme is no longer being maintained.
Signs of Abandonment
Theme updates have stopped. The developer’s website is inactive. The theme has not been updated for WordPress compatibility in over a year. Support tickets go unanswered.
Why Continuing Is Risky
An abandoned theme accumulates risks. Security vulnerabilities do not get fixed. WordPress compatibility drifts. New features are unsupported. The theme gets harder to maintain over time.
Replacement Is Usually Right
The right answer for an abandoned theme is replacement. Yes, switching themes is work. But continuing on an abandoned theme is worse.
Plan the transition: find a maintained replacement theme that fits your needs, set up a child theme on the new theme for customizations, transfer content and customizations, test thoroughly, then switch.
Holding Strategy
If immediate replacement is not feasible, take steps to reduce risk. Use a Web Application Firewall to filter attacks. Increase backup frequency. Watch for security warnings about your theme. Plan the replacement for the near future.
How to Choose Themes That Update Well
For new sites or theme replacements, picking maintained themes saves future problems.
Active Development
Look for themes that have been updated recently and consistently. The WordPress.org repository shows update history. Theme marketplaces like ThemeForest show recent activity.
Established Developers
Themes from established developers with multiple themes tend to get more sustained maintenance. Individual developers may abandon themes if life circumstances change.
Strong Community
Themes with active forums, large user bases, and responsive support tend to be better maintained.
Modern Architecture
Themes built for current WordPress (Block Editor support, performance optimization, accessibility) are more likely to be maintained going forward than older themes with legacy architectures.
Reasonable Feature Set
Themes that try to do everything (page builder, SEO, e-commerce, social, gallery, slider all built in) are harder to maintain than themes focused on being good themes. The bloated approach creates more potential breakage points.
Premium vs Free Themes
The same question that comes up with plugins applies to themes.
Update Reliability
Premium themes generally get more reliable updates. Revenue supports ongoing development.
Quality of Support
Premium themes typically have proper support channels. Free themes vary widely.
Documentation
Premium themes usually have better documentation. This matters when you need to customize or troubleshoot.
Cost vs Benefit
Premium themes cost $30 to $100 typically as one-time purchases or annual subscriptions. For the theme that defines your site’s appearance, the cost is usually reasonable.
For most business sites, premium themes are worth the cost. For hobby or experimental sites, free themes are fine.
Theme Audit & Cleanup
Beyond updates, periodic review keeps things healthy.
Remove Unused Themes
Most WordPress installations have multiple themes installed even though only one is active. Old themes from when you were choosing. The default WordPress theme. Themes you tested but never used.
Each inactive theme is a potential vulnerability. The right approach is to delete inactive themes, keeping only the active theme and one default WordPress theme as a fallback.
Review the Active Theme
Is the active theme still right for your site? Has the site evolved beyond what the theme handles well? Are you fighting against the theme to make things work?
Periodic review prevents staying with a theme that no longer fits.
Check Theme Settings
Theme settings sometimes drift over time. Settings that were appropriate for an old version of WordPress may not work well anymore. Default settings may have changed.
A periodic review of theme settings ensures everything is configured well.
Common Theme Mistakes
People stumble in predictable ways.
Never Updating
Some sites run themes that have not been updated in years. They sit on growing security and compatibility risks.
Editing Theme Files Directly
The classic mistake. Customize themes by editing files, lose the customizations on update.
Keeping Inactive Themes
Old themes that no longer get used should be deleted. Keeping them around adds risk.
Choosing Themes Poorly
Picking a theme based on demos rather than maintenance and code quality. The pretty theme that gets abandoned is worse than a less flashy theme that gets maintained.
Heavy Customization on Bad Themes
The more heavily customized a theme is, the harder it becomes to replace. Picking the wrong theme and then heavily customizing it traps you with the wrong theme.
Closing Thoughts on Theme Care
Theme maintenance is the least-discussed part of WordPress maintenance but it matters in ways people often miss. Security vulnerabilities in themes are real. WordPress compatibility requires ongoing theme updates. Bugs get fixed over time and updates bring those fixes.
For most sites, the right approach is to apply theme updates promptly, ideally after testing on staging. Use a child theme for customizations so you do not lose work during updates. Remove inactive themes to reduce attack surface. Replace themes that have been abandoned by their developers.
The hesitation people feel about theme updates is understandable. The visual impact of a broken theme is immediate and visible. But the alternative is running outdated code with growing risks. The right answer is not to skip updates. It is to set up customizations correctly so updates do not break things.
For new sites or theme replacements, choosing maintained themes from active developers prevents this problem from the start. The theme that gets updated for years saves the work of replacing themes that fall behind.
Theme care is part of the broader WordPress maintenance picture. It does not need much attention week to week if set up correctly. But it does need attention. Updates need to happen. Customizations need to be done right. Inactive themes need to be cleaned up. Sites that handle theme maintenance well stay current and secure. Sites that ignore it find themselves on outdated themes that eventually become liabilities. The choice is not between updating themes and not updating themes. It is between setting up theme management well or fighting theme problems for years.
