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I don’t know how I upgraded the php version in Heroku to version 7.3, however this version (7.3.) is causing several bugs in the application, with do I can downgrade to version 7.2. ?
I have already tried to change the version in Composer.json to:
"require": {
"php": "7.2.*",
But when deploying is installed version 7.3 in the same