The W series has covered , and — JS library version jumps and PHP minimum requirement changes — are most likely to appear during plugin updates. After updating any plugin with heavy JavaScript dependencies, open the browser console and check for JS errors before calling the step done.
If WP-CLI itself starts throwing errors or crashing after a plugin update, — Classic Theme child theme customizations breaking when switching to Block Themes — is most likely to appear here if theme updates involve moving from one theme architecture to another. That’s a case where the theme update decision needs to be treated separately from the core upgrade decision.
Rolling back when something goes wrong
Have these commands ready before starting. Running the upgrade without knowing the rollback path in advance is the kind of setup where panic sets in under pressure.
Roll back core
# Force-reinstall a specific prior version of core
wp core update --version=6.4 --force
# Restore the database from the backup taken in STEP 0
wp db import backup_20260615_090000.sql.gz
--force installs the specified version even if it’s already installed — necessary when rolling back to the previous version that’s already recorded as the current one.
Roll back a plugin
# Force-install a specific prior version of a plugin
wp plugin install contact-form-7 --version=5.8.3 --force
Plugin rollback is covered in detail in : continuing plugin updates on an unstable core adds another variable to an already unclear state. Stabilize core first, then resume.
Summary
| Command | When to use |
|---|---|
wp core check-update | Baseline check before starting |
wp db export | Immediately before core update (required) |
wp core update --version=X.X | Core update with explicit version |
wp core update-db | Immediately after core update (required) |
wp core verify-checksums | Core file integrity check |
wp plugin update <name> | One plugin at a time, check between each |
wp theme update <name> | Theme update, visual check after |
wp core update --version=X.X --force | Core rollback if needed |
wp plugin install <name> --version=X.X.X --force | Plugin rollback if needed |
Where W1–W4 fit together:
| Post | Topic |
|---|---|
| W1 — What to check | |
| W3 — What can go wrong | |
| W6 — Verifying the result | 7-step post-upgrade checklist |
Running updates in stages isn’t a slower path — it’s the path that keeps each step reversible and each problem identifiable. When something breaks after a one-at-a-time update sequence, you know exactly which step caused it. That clarity is what makes the difference between a short investigation and a long one.
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