## New stable modules

The following modules, previously considered experimental, are now stable and
safe for use on production sites, with full backwards compatibility and upgrade
paths from 8.4.0 to future releases:

* // That or we'll have to be adding a "Removed experimental modules" section.

## Third-party library updates

* [Drupal's Symfony dependency has been updated from Symfony 2.8 to Symfony
  3.2](https://www.drupal.org/node/2712647). This major version update is
  necessary because Symfony 2.8 support will end around the release of Drupal
  8.6.0 next year. [See the change record for information about Symfony 3 BC
  breaks that affected Drupal core](https://www.drupal.org/node/2743809).
  [Drupal 8 also requires Symfony 3.2.8](https://www.drupal.org/node/2871253)
  because of a bug in Symfony 3.2.7.
* [zendframework/zend-diactoros has been updated from 1.3.10 to 1.4.0].

## Experimental modules