[mmukhin@ip-10-169-2-131 api]$ php composer.phar update
Loading composer repositories with package information

Fatal error: Call to undefined function Composer\Repository\hash() in phar:///home/mmukhin/src/api/composer.phar/src/Composer/Repository/ComposerRepository.php on line 540

And the composer.json
[mmukhin@ip-10-169-2-131 api]$ cat composer.json
{
"name": "vendor/laravel",
"description": "x",
"authors": [
{
"name": "Michael Mukhin",
"email": "[email protected]"
}
],
"require": {

}

}

Phar is installed with php, but executing phar binary causes error
[mmukhin@ip-10-169-2-131 api]$ phar

Fatal error: Uncaught exception 'PharException' with message 'zlib extension is required for gz compressed .phar file "/usr/bin/phar.phar"' in /usr/bin/phar.phar:57
Stack trace:
#0 /usr/bin/phar.phar(57): Phar::mapPhar()
#1 {main}

thrown in /usr/bin/phar.phar on line 57

Any ideas? Thanks in advance everyone.