Based on https://github.com/zfcampus/zf-apigility-skeleton/releases/tag/1.5.1 (commit 44529a51db76ce3c535b96ec07308357ca8f6b31 in this repo)
zfcampus/zf-apigility-skeleton#165 updates the
composer installusing a PHP 5.6 release. This was done as the 1.5.0 release was made using a PHP 7.1+ binary, and thus installed versions of dependencies that were compatible with those release - but not with 5.6. Once a release is made with this patch, users on PHP 5.6 will be able to install the skeleton again.
However, this means that PHP 7.1+ users will need to execute the following after an initial skeleton install in order to get newer versions of libraries compatible with 7.1:
$ rm -Rf composer.lock vendor $ composer install