diff --git a/common/Define/ArrayOutput.php b/common/Define/ArrayOutput.php
new file mode 100644
index 0000000..d9aaddb
--- /dev/null
+++ b/common/Define/ArrayOutput.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace ProVM\Common\Define;
+
+use Symfony\Component\Console\Output\Output;
+
+class ArrayOutput extends Output {
+    private $lines;
+    private $delta;
+
+    public function clear() {
+        $this->lines = [];
+        $this->delta = 0;
+    }
+
+    public function fetch() {
+        return $this->lines;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($verbosity = self::VERBOSITY_NORMAL, $decorated = false, $formatter = null) {
+        parent::__construct($verbosity, $decorated, $formatter);
+        $this->lines = [];
+        $this->delta = 0;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function doWrite($message, $newline) {
+        if (empty($this->lines[$this->delta])) {
+            $this->lines[$this->delta] = [];
+        }
+        if ($message) {
+            $this->lines[$this->delta][] = trim($message);
+        }
+        if ($newline) {
+            $this->delta++;
+        }
+    }
+}
diff --git a/common/Service/Composer.php b/common/Service/Composer.php
new file mode 100644
index 0000000..3286e4f
--- /dev/null
+++ b/common/Service/Composer.php
@@ -0,0 +1,102 @@
+<?php
+namespace ProVM\Common\Service;
+
+use Psr\Container\ContainerInterface as Container;
+use Composer\Console\Application;
+use Symfony\Component\Console\Input\ArrayInput as Input;
+use ProVM\Common\Define\ArrayOutput as Output;
+
+class Composer {
+  const MAYOR = 0;
+  const MINOR = 1;
+  const PATCH = 2;
+  const RELEASE = 3;
+
+  protected $composer_file;
+  public function __construct(string $composer_file) {
+    $this->composer_file = $composer_file;
+  }
+
+  public function search($query): array {
+    putenv('COMPOSER=' . $this->composer_file);
+    $input = new Input([
+      'command' => 'search',
+      'tokens' => [$query]
+    ]);
+    $output = new Output();
+    $app = new Application();
+    $app->setAutoExit(false);
+    $app->run($input, $output);
+    return $this->parseOutput($output->fetch());
+  }
+  protected function parseOutput(array $input): array {
+    $output = [];
+    foreach ($input as $line) {
+      if (strpos($line[0], '<') !== false) {
+        continue;
+      }
+      $pos = strpos($line[0], ' ');
+      $name = substr($line[0], 0, $pos);
+      $desc = substr($line[0], $pos + 1);
+      $output []= (object) compact('name', 'desc');
+    }
+    return $output;
+  }
+  public function latest(string $package): string {
+    putenv('COMPOSER=' . $this->composer_file);
+    $input = new Input([
+      'command' => 'show',
+      '--all' => true,
+      '--latest' => true,
+      'package' => $package
+    ]);
+    $output = new Output();
+    $app = new Application();
+    $app->setAutoExit(false);
+    $app->run($input, $output);
+    $arr = $output->fetch();
+    $latest = '*';
+    foreach ($arr as $line) {
+      if (strpos($line[0], 'latest') === false) {
+        continue;
+      }
+      list($option, $value) = explode(':', $line[0]);
+      if (trim($option) == 'latest') {
+        $latest = trim($value);
+      }
+    }
+    return $latest;
+  }
+  public function getLatest(array $packages, int $semver = Composer::MINOR): array {
+    $output = [];
+    foreach ($packages as $package) {
+      $latest = $this->semver($this->latest($package), $semver);
+      $output[$package] = $latest;
+    }
+    return $output;
+  }
+  protected function semver(string $version, int $semver) {
+    switch ($semver) {
+      case Composer::PATCH:
+      case Composer::RELEASE:
+        return $version;
+      case Composer::MINOR:
+        if (strpos($version, '.') === false) {
+          return $version;
+        }
+        $v = explode('.', $version);
+        if (count($v) < 3) {
+          return '^' . $version;
+        }
+        array_pop($v);
+        $version = '^' . implode('.', $v);
+        return $version;
+      case Composer::MAYOR:
+        if (strpos($version, '.') === false) {
+          return $version;
+        }
+        $v = explode('.', $version);
+        return '^' . $v[0];
+    }
+  }
+}