Composer, not getting latest

Hi, I installed via composer: https://packagist.org/packages/tpyo/amazon-s3-php-class

But doesn't get the latest version, it's getting 0.5.1, but it doesn't include the most recent commit... specifically this one: "fix a wrong word in line 1924" https://github.com/tpyo/amazon-s3-php-class/commit/4ad2e3285643bb2a47218caac46db59e75c48a10

Would it be possible to release new versions? I feel a bit compromised by depending on dev-master.