Livewire v4.3.5: What Changed and Why It Matters
Released on 3 August 2026, Livewire v4.3.5 is a focused patch release for the v4.x branch. It ships exactly one fix, but it addresses a real-world parsing edge case that could silently break Single File Component (SFC) detection in certain PHP codebases.
The Problem: SFC Detection Failing on PHP Attribute Array Arguments
Livewire v4 introduced support for Single File Components — a syntax that lets you co-locate your Blade template and component class in a single .blade.php file. Under the hood, Livewire parses the file to detect whether it is an SFC.
The bug fixed in this release occurred when a PHP attribute on the component class contained an array argument. For example:
#[SomeAttribute(['key' => 'value'])]
class MyComponent extends Component
{
// ...
}
The square brackets inside the attribute's argument list were being misinterpreted by the SFC detector, causing it to fail to recognise the file as a valid Single File Component. Depending on your setup, this could result in the template not being found or the component not rendering at all.
The Fix
Contributor @joshhanley identified and resolved the issue in pull request #10480. The fix corrects the SFC detection logic so that array arguments inside PHP attributes are properly handled during parsing, regardless of their complexity.
No public API changes were made. The fix is purely internal to the SFC detection mechanism.
Should You Upgrade?
If your Livewire v4 components use PHP attributes with array arguments — for example, attributes from packages like Spatie's Laravel Data, custom validation attributes, or any attribute that accepts an array — you should upgrade to v4.3.5 immediately.
Even if you are not currently affected, upgrading is low-risk given the patch-level nature of this release.
Update via Composer:
composer update livewire/livewire
Verify the installed version:
composer show livewire/livewire | grep versions
Key Takeaways
- v4.3.5 contains a single bug fix targeting SFC detection.
- The root cause was PHP attribute array arguments confusing the SFC parser.
- The fix is non-breaking; no code changes are required on your end.
- All Livewire v4 projects using PHP attributes with array syntax should upgrade.
- Credit goes to @joshhanley for the diagnosis and patch.
Full Changelog
You can review the diff between v4.3.4 and v4.3.5 directly on GitHub to confirm the scope of changes before deploying to production.
