PHP 8.4 now available

Change effective on 19 December 2024

PHP version 8.4.1 is now available as a runtime version for PHP applications on Heroku. It is available on the heroku-22 and heroku-24 stacks.

The following third-party PHP extensions have not yet been made compatible with PHP 8.4 by their respective upstream vendors and are therefore not available:

  • ext-newrelic
  • ext-phalcon

The following PHP extensions have been added or updated:

The following new Composer versions are now available for use during builds: