We're receiving tickets from customers having a fatal error after updating Woocommerce to 4.4.0.
Still investigating this. According to Remy, it looks like they are using the same container package as us, but not the same version, they are on the new one that requires PHP 7 and that includes breaking changes.

Errors are similar to this:
Fatal error: Declaration of League\Container\ImmutableContainerAwareTrait::getContainer() must be compatible with League\Container\Argument\ArgumentResolverTrait::getContainer(): Psr\Container\ContainerInterface in /home/446954.cloudwaysapps.com/krxgzndejz/public_html/wp-content/plugins/wp-rocket/vendor/league/container/src/Inflector/Inflector.php on line 32