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# Upgrading
## From v5 to v6
- There are no breaking changes to the API. Internally, we shuffled around some checks around crawl limit that might affected some edge cases
## 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.
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