luceos InfinitzHost if it says killed your php cli process has insufficient memory. Even if your account - in total - has 1GB doesn't mean that php can draw on that amount. Try running free -m to see what amounts you have available.
clarkwinkelmann InfinitzHost you can check out Composer's memory limit troubleshooting steps https://getcomposer.org/doc/articles/troubleshooting.md#memory-limit-errors If that doesn't help, maybe it can also be related to PHP's execution_time