The trailing slash is messing up the query in tag 2.0.1 [Tag 2.0.1](https://github.com/KnpLabs/php-github-api/blob/2.0.1/lib/Github/Client.php#L318) $builder->addPlugin(new PathPrepend(sprintf('/api/%s/', $this->getApiVersion()))); [Master](https://github.com/KnpLabs/php-github-api/blob/master/lib/Github/Client.php#L324) works $builder->addPlugin(new PathPrepend(sprintf('/api/%s', $this->getApiVersion())));