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# Upgrading Because there are many breaking changes an upgrade is not that easy. There are many edge cases this guide does not cover. We accept PRs to improve this guide. ## From v3 to v4 - The `CrawlObserver` and `CrawlProfile` are upgraded from interfaces to abstract classes, so you have to convert your old observers and profiles. `crawled` now receives every successfully crawled uri, `crawlFailed` every failed one. ## From v2 to v3 - PHP 7.1 is now required as a minimum version. - Instead of using our custom `\Spatie\Crawler\Url` object, we're now using the `Psr\Http\Message\UriInterface`. Custom Profiles and Observers will need to be changed to have the correct arguments and return types. We're using `\GuzzleHttp\Psr7\Uri` as the concrete URI implementation.