There seems to be some issue with symplify packages on Packagist. I'm trying to update my app to PHPUnit 9. One of the incompatible packages that popped up was
symplify/easy-coding-standard-tester. However I noticed that in the master branch this is fixed already so I thought it would work fine with
Turns out neither work at the moment. According to packagist dev-master only allows PHPUnit ^8.5. It seems the changes didn't make it to Packagist somehow. Perhaps there is something wrong with your integration between Packagist and GitHub?