How to WordPress Update Without Breaking Your Site
It's a situation that strikes fear into the hearts of WordPress publishers everywhere: that moment when the dashboard announces “a new update is available,” and you hesitate, wondering, “should I actually update WordPress now, or will that break my site?”
WordPress itself isn't interested in that fear, as it has no built-in rollback functionality. When updates go wrong, it falls to you to rely on your backups and be able to restore the site. Ideally, you'd like to know in advance—before you press “update”—that the changes will work.
That's where a staging environment comes in. Coupled with a consistent update workflow, you can embrace WordPress updates as a predictable maintenance task rather than an aversion.
What WordPress Actually Does When You Update
When you trigger an update in the WordPress admin, what happens under the hood?
For core updates, WordPress calls upgrade functions defined in wp-admin/includes/upgrade.php. The core update process uses make_db_current and make_db_current_silent to check the database schema against the current version of WordPress and apply any necessary changes.
Plugins take a slightly different path. WordPress downloads a new ZIP package from the plugin repository (or an API endpoint if it is premium or custom). It extracts this ZIP to a temporary directory under wp-content/upgrade, then replaces the existing plugin files with the new ones.
These file operations are often the point of failure. If permissions are incorrect, if the process is interrupted, or if a file can't be replaced, the update can break before it even begins.
Often, plugins will trigger their activation or upgrade routines. Many execute register_activation_hook, or use their own cron jobs and files to migrate data or remove the cache. Encountering unexpected data can cause these routines to go awry, leading to incompatibilities or downtime.
But it’s not all doom and gloom. With a staged update process, you get the chance to discover these pitfalls before they hit your live site.
Why Updates Break Sites
Anyone who's ever pressed “update” in wp-admin knows that feeling: what if it breaks the site? It’s a reasonable fear, because updates can and do cause issues. But where do those issues come from?
WordPress does not provide native rollback for updates, so we must rely on backups and external tooling. However, performing a rollback from a backup involves more than just flipping a switch.
For the rare backup provider that offers true point-in-time restores, it’s nearly as simple as deleting the erroneous update. But for most of us, restores are a more involved process.
Ideally, you'd only rely on your rollback process when you need to. Keeping issues from happening is better than fixing the damage afterwards. But how?
It starts at the point of update. Even though WordPress doesn’t provide a native rollback, it does provide a staging site.
That staging environment is crucial. When you deploy changes to production right from the staging site, you assume that staging matches production closely. But if staging is not properly configured, that first update on the live site can be a breakage waiting to happen.
And when a deployment does go wrong, having clear rollback criteria is critical. Guides recommend defining your rollback criteria up front: when will you roll back? Do you let things ride, or restore from a snapshot? These conversations should happen before you press “update.”
The core update process in WordPress is consistent, but how it interacts with your plugins, themes, and custom settings can vary. Given that, your staging site will keep you on solid ground for when things get wild.
The Staging Environment That Makes Updates Boring
Staging is more than just a test site. In order to provide reliable feedback, a staging site must be an exact copy of the production site.
That doesn't mean just matching the structure. It means every single variable, including:
- PHP and MySQL versions,
- Caching configuration
- Cron jobs
- SSL setup
In essence, you need staging to be an exact copy of production. This maximizes the accuracy of testing. Mirroring production ensures that any behavior you observe on staging will be replicated on the live site. Once you have it all set up, how do you use it?
In WordPress, updating goes like this:
- Create a staging environment
- Take a fresh snapshot (backing up both the files and the database)
- Update in the staging environment
- Perform a full set of tests
- Once you're sure everything is functioning properly, apply the same changes to the production site
- Monitor closely after the update
This is a routine you can perform for every update. And you should.
Why? Because it stops updates from being scary. With a staging site and a repeatable process, updates become routine maintenance, not crisis events.
Staging doesn't stop you from updating once, it structures the update process to make updates routine. This way you can know in advance what will happen, and how to respond if things go awry.
A Repeatable Update Routine (Core, Theme, Plugins)
The goal of staging is to create the ability to treat updates as a routine maintenance event. But how exactly do you do it?
WordPress updates follow a specific sequence. Guides recommend updating plugins before the core, and then the active theme. Verify everything is in working order. And consider staging each update separately—WordPress updates affect core WordPress and the database, but plugin updates depend on the current WordPress core version, so staging each separately can help solve conflicts.
There’s no set timeline on how often to update your site. Some agencies wait 3-5 days after a major release, reading change logs and verifying compatibility. Others deploy on day one.
That said, waiting too long can expose you to vulnerabilities. And WordPress is better off with all the updates. So figure out which update sequence works for you, and adopt it.
After that, it's a matter of verifying the update worked. This typically means logging in and clicking through. Test your forms, your checkout process, and your most important features. And if things don't go as expected, you'll know how to resolve it.
Rollback: Making Sure “Undo” Actually Works
What makes a WordPress update really safe? The ability to undo it.
WordPress itself doesn't have a built-in rollback feature. Instead, the rollback process relies on your backups–or, should you be so keen, your version control system.
To roll back a WordPress update, you may need to:
- Delete the faulty plugin files and replace them with the previous versions
- Delete the faulty theme from the server
- Revert core files or the database from a specific snapshot
The rollback itself doesn't require a specialized tool. You can revert changes with Snapshot, WP-CLI, SFTP, your host's backups, or Git with a little duct tape. The key is having access to the right files and knowing how to restore them.
For some sites, the ramifications of a broken update are more extreme. Sites with in-progress transactions, for example, can't afford a full-site rollback. For them, point-in-time snapshots become crucial.
Point-in-time backups store a snapshot of your site's state at a specific point. Some backup solutions offer it. Some hosts, for example, back up every time you make a change. Automated backups can't get more granular than that.
Another backup type is incrementals. Like point-in-time, incremental backups capture the exact before state. But they provide an hourly peace of mind: even if your rollback criteria are triggered right after an update, you’ll be able to restore your site to the point before that.
Even with a solid rollback in place, it's still vital to prevent breakages whenever you can. That’s where a staging environment is so crucial. With testing, you can avoid the majority of issues. And when you couple automated, granular backups with a dedicated staging environment, you’ve ensured that even if things do fall apart, you’ll know exactly how to pick up the pieces.
Turning Fear into Routine
It’s easy to feel paralyzed by the thought of updating. For some, WordPress updates are a stress-inducing event, fraught with the threat of a broken site. But they don’t have to be that way, as long as you’re prepared.
The key is to think of WordPress updates as the routine maintenance they really are. With a staging environment in place, you can test updates before they go live, making the live updates predictable rather than intractable. Coupled with consistent backups, a staging environment transforms WordPress updates from potential crises into mundane, routine events.
WordPress updates can be scary. But they don’t have to be. It just takes a staging environment, a backup strategy, and a bit of preparation to turn fear into a minor job you can complete quicker and safer.