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What compatibility information can—and cannot—tell you
In the WordPress dashboard, open Plugins → Installed Plugins and review the update details and compatibility information for the plugin. WordPress.org listings may indicate whether a plugin is compatible with your WordPress version or has not been tested against it. “Untested” means compatibility is unknown; an old update date is not proof that the plugin is broken. Read the changelog and the listing’s compatibility details, when available. WordPress documentation: Manage Plugins.
For a theme, review its update notice and the theme author’s changelog or compatibility information where available. Check for custom changes before replacing theme files: modifications made directly to files that an update replaces may be lost. This depends on where and how customizations were made; do not assume every theme update overwrites every customization. WordPress’s update guidance discusses the risk of replacing modified files. WordPress documentation: Updating WordPress.
Compatibility information narrows uncertainty but cannot certify how a component will behave with your theme, other plugins, server configuration, or site-specific settings. Treat it as a screening step, not a pass/fail guarantee.
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Record the versions and review Site Health
Before testing, note the plugin or theme name and its installed and proposed versions, your WordPress version, and the PHP version used by the site. Check whether the component’s stated requirements match those versions. If the update also involves changing PHP, record the current and target PHP versions separately; that is an additional compatibility change, not simply part of the plugin or theme update.
Open Dashboard → Tools → Site Health and review the Status screen’s issues and recommendations. Site Health may report outdated PHP or plugins waiting for updates, among other site-level concerns. It is a diagnostic report, not a compatibility certificate for a particular update. WordPress documentation: Site Health screen and Site Health overview.
WordPress’s PHP guidance recommends checking compatibility before updating PHP, but warns that its automated compatibility checker can miss issues or flag false positives. If a result is unclear, check the component’s requirements or ask its developer or your host rather than treating the scan as definitive. WordPress: Get a faster, more secure website: update your PHP today.
Make a backup you can actually restore
Before updating, back up both the site files and database using a method suited to your hosting setup. Find the restore instructions and confirm you can access the backup and follow them before you need to. A backup is useful only if it can be restored; WordPress recommends being able to roll back if an update goes wrong. WordPress documentation: Updating WordPress.
WordPress.org puts the reason plainly: “Before enabling auto-updates on your plugins and themes, you may want to make sure you’re able to rollback to a previous version of your website in case things go wrong.” WordPress documentation: Plugin and themes auto-updates.
Test the update on staging when possible
If your host or established site workflow provides a staging environment, use a recent copy of the site with representative content and settings. Apply the proposed plugin or theme update there first. Staging is a practical way to catch problems without putting the live site at immediate risk; it does not guarantee the result will match production. Server configuration, external services, integrations, and live traffic may differ.
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Test the workflows that matter to your site, including the feature supplied by the component. Choose checks based on what your site actually uses:
- Open the homepage and important landing pages; check layout, images, and navigation.
- Submit forms and confirm that submissions reach their expected destination.
- Test login and account functions if the component affects them.
- Complete a checkout or booking flow, if your site offers one.
- Open the editor and check any content or controls tied to the plugin or theme.
- Review pages that depend on the updated component, including relevant interactive features.
These are site-specific checks, not a universal WordPress checklist. A successful update on staging increases confidence, but does not prove every production condition has been reproduced.
Update production and verify the same workflows
When staging checks pass—or if staging is unavailable and you decide to proceed—choose a time when you can monitor the site. Keep the backup and its restore instructions accessible. After updating, repeat the same high-priority checks on the live site and review Site Health and any logs available to you. WordPress recommends keeping plugins and themes updated, while also advising site owners to preserve a recovery route. WordPress documentation: Plugin and themes auto-updates.
If the update breaks something
If the site is materially broken, use your prepared backup and the host’s documented restore process. If you are unsure how to restore production, contact the host or a qualified WordPress professional rather than experimenting on a live site.
For troubleshooting, WordPress documents disabling plugins as one diagnostic option. Its FAQ describes renaming the plugins folder as a way to disable plugins; plugins then need to be reactivated manually. This is a recovery or troubleshooting step, not a substitute for a tested backup. WordPress documentation: FAQ Troubleshooting.
Quick Recap
A quick decision check before updating
- Compatibility: Does the listing state compatibility with your WordPress version, or is it untested? Have you checked the changelog and requirements?
- PHP: Does the component support the site’s PHP version? If PHP is changing too, have you assessed that change separately?
- Theme customizations: Do you know where custom changes live, and whether the update replaces those files?
- Recovery: Do you have a current backup of both files and database, and a restore route you can use?
- Validation: Can you test the update in staging and exercise the site’s important workflows before and after the live update?
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