How to review WordPress release notes and plan an update

WordPress core releases come with release notes that explain what changed. Reading them before you update is the difference between a documented decision and an unplanned outage, so this article gives a repeatable review process.

Read the changelog

• Find the right notes. For core updates, WordPress publishes a release post and the developer changelog with technical details such as version bumps, deprecated functions and database changes. Plugin and theme updates carry their own changelogs in the repository.
• Scan for security notes. A release that fixes a security issue usually says so and often carries a severity. Treat a security-focused release as high priority to apply, but still confirm your stack before rolling out.
• Spot compatibility landmines. Look for mentions of minimum PHP version, database or schema changes, deprecated features, and changes to hooks or functions your site relies on.

Assess the risk

• Minor versus major. Minor releases are backward-compatible maintenance; major releases can drop old PHP versions, change behaviour, and retire deprecated APIs. Your review effort should scale accordingly.
• Map changes to your theme and plugins. If the changelog touches features you use (custom post types, REST API, media, block editor, multisite), flag those dependencies and check that the relevant plugins still support the target version.
• Check PHP compatibility. Confirm the release's minimum PHP version against your host's PHP, following the PHP upgrade guidance if you need to raise it first.

Plan and test

1. Snapshot first. Take a backup (database and files) before any update, following the backup before changes checklist, so you can roll back cleanly.
2. Test on staging. Apply the update on a staging copy of the site while your live site stays on the current version. Watch for fatal errors and check key flows.
3. Apply on production in a maintenance-aware way. When you update live, do it at a low-traffic time and monitor site health immediately. If the site goes to an error page, the update-on-500 guide walks the recovery.
4. Keep a dated note. Record the version before, the version after, the PHP level, and any issues you saw. This becomes your reference for future updates and for diagnosing a regression later.

Prevention

• Subscribe to release notifications so you read each changelog rather than reacting to a failed update.
• Keep plugins and themes recent enough that you are never many versions behind a core release, which minimises surprises.
• Run a staging environment regularly so testing updates is routine, not a special project.

When to involve a professional

Involve a developer if a major core release touches heavily customised code, if a plugin you depend on is unmaintained, or if you cannot run staging. A custom theme that uses deprecated APIs often needs code changes before a major upgrade.