diff --git a/src/StaticPHP/Artifact/ArtifactCache.php b/src/StaticPHP/Artifact/ArtifactCache.php
index cd9ad640..7626831a 100644
--- a/src/StaticPHP/Artifact/ArtifactCache.php
+++ b/src/StaticPHP/Artifact/ArtifactCache.php
@@ -282,6 +282,16 @@ class ArtifactCache
         logger()->debug("Removed binary cache entry for [{$artifact_name}] on platform [{$platform}]");
     }
 
+    /**
+     * Get the names of all artifacts that have at least one downloaded entry (source or binary).
+     *
+     * @return array<string> Artifact names
+     */
+    public function getCachedArtifactNames(): array
+    {
+        return array_keys($this->cache);
+    }
+
     /**
      * Save cache to file.
      */
diff --git a/src/StaticPHP/Artifact/ArtifactDownloader.php b/src/StaticPHP/Artifact/ArtifactDownloader.php
index 8b64b60c..a9a25915 100644
--- a/src/StaticPHP/Artifact/ArtifactDownloader.php
+++ b/src/StaticPHP/Artifact/ArtifactDownloader.php
@@ -362,7 +362,8 @@ class ArtifactDownloader
             if ($result !== null) {
                 return $result;
             }
-            throw new WrongUsageException("Artifact '{$artifact_name}' downloader does not support update checking.");
+            // logger()->warning("Artifact '{$artifact_name}' downloader does not support update checking, skipping.");
+            return new CheckUpdateResult(old: null, new: null, needUpdate: false, unsupported: true);
         }
         $cache = ApplicationContext::get(ArtifactCache::class);
         if ($prefer_source) {
@@ -393,7 +394,33 @@ class ArtifactDownloader
                 'old_version' => $info['version'],
             ]);
         }
-        throw new WrongUsageException("Artifact '{$artifact_name}' downloader does not support update checking, exit.");
+        // logger()->warning("Artifact '{$artifact_name}' downloader does not support update checking, skipping.");
+        return new CheckUpdateResult(old: null, new: null, needUpdate: false, unsupported: true);
+    }
+
+    /**
+     * Check updates for multiple artifacts, with optional parallel processing.
+     *
+     * @param  array<string>                    $artifact_names Artifact names to check
+     * @param  bool                             $prefer_source  Whether to prefer source over binary
+     * @param  bool                             $bare           Check without requiring artifact to be downloaded first
+     * @param  null|callable                    $onResult       Called immediately with (string $name, CheckUpdateResult) as each result arrives
+     * @return array<string, CheckUpdateResult> Results keyed by artifact name
+     */
+    public function checkUpdates(array $artifact_names, bool $prefer_source = false, bool $bare = false, ?callable $onResult = null): array
+    {
+        if ($this->parallel > 1 && count($artifact_names) > 1) {
+            return $this->checkUpdatesWithConcurrency($artifact_names, $prefer_source, $bare, $onResult);
+        }
+        $results = [];
+        foreach ($artifact_names as $name) {
+            $result = $this->checkUpdate($name, $prefer_source, $bare);
+            $results[$name] = $result;
+            if ($onResult !== null) {
+                ($onResult)($name, $result);
+            }
+        }
+        return $results;
     }
 
     public function getRetry(): int
@@ -411,6 +438,61 @@ class ArtifactDownloader
         return $this->options[$name] ?? $default;
     }
 
+    private function checkUpdatesWithConcurrency(array $artifact_names, bool $prefer_source, bool $bare, ?callable $onResult): array
+    {
+        $results = [];
+        $fiber_pool = [];
+        $remaining = $artifact_names;
+
+        Shell::passthruCallback(function () {
+            \Fiber::suspend();
+        });
+
+        try {
+            while (!empty($remaining) || !empty($fiber_pool)) {
+                // fill pool
+                while (count($fiber_pool) < $this->parallel && !empty($remaining)) {
+                    $name = array_shift($remaining);
+                    $fiber = new \Fiber(function () use ($name, $prefer_source, $bare) {
+                        return [$name, $this->checkUpdate($name, $prefer_source, $bare)];
+                    });
+                    $fiber->start();
+                    $fiber_pool[$name] = $fiber;
+                }
+                // check pool
+                foreach ($fiber_pool as $fiber_name => $fiber) {
+                    if ($fiber->isTerminated()) {
+                        // getReturn() re-throws if the fiber threw — propagates immediately
+                        [$artifact_name, $result] = $fiber->getReturn();
+                        $results[$artifact_name] = $result;
+                        if ($onResult !== null) {
+                            ($onResult)($artifact_name, $result);
+                        }
+                        unset($fiber_pool[$fiber_name]);
+                    } else {
+                        $fiber->resume();
+                    }
+                }
+            }
+        } catch (\Throwable $e) {
+            // terminate all still-suspended fibers so their curl processes don't hang
+            foreach ($fiber_pool as $fiber) {
+                if (!$fiber->isTerminated()) {
+                    try {
+                        $fiber->throw($e);
+                    } catch (\Throwable) {
+                        // ignore — we only care about stopping them
+                    }
+                }
+            }
+            throw $e;
+        } finally {
+            Shell::passthruCallback(null);
+        }
+
+        return $results;
+    }
+
     private function probeSourceCheckUpdate(Artifact $artifact, string $artifact_name): ?CheckUpdateResult
     {
         if (($callback = $artifact->getCustomSourceCheckUpdateCallback()) !== null) {
diff --git a/src/StaticPHP/Artifact/Downloader/Type/CheckUpdateResult.php b/src/StaticPHP/Artifact/Downloader/Type/CheckUpdateResult.php
index 468b643b..7e46e4ad 100644
--- a/src/StaticPHP/Artifact/Downloader/Type/CheckUpdateResult.php
+++ b/src/StaticPHP/Artifact/Downloader/Type/CheckUpdateResult.php
@@ -8,7 +8,8 @@ readonly class CheckUpdateResult
 {
     public function __construct(
         public ?string $old,
-        public string $new,
+        public ?string $new,
         public bool $needUpdate,
+        public bool $unsupported = false,
     ) {}
 }
diff --git a/src/StaticPHP/Command/CheckUpdateCommand.php b/src/StaticPHP/Command/CheckUpdateCommand.php
index 4fac0f63..1663337c 100644
--- a/src/StaticPHP/Command/CheckUpdateCommand.php
+++ b/src/StaticPHP/Command/CheckUpdateCommand.php
@@ -4,7 +4,10 @@ declare(strict_types=1);
 
 namespace StaticPHP\Command;
 
+use StaticPHP\Artifact\ArtifactCache;
 use StaticPHP\Artifact\ArtifactDownloader;
+use StaticPHP\Artifact\Downloader\Type\CheckUpdateResult;
+use StaticPHP\DI\ApplicationContext;
 use StaticPHP\Exception\SPCException;
 use Symfony\Component\Console\Attribute\AsCommand;
 use Symfony\Component\Console\Input\InputArgument;
@@ -17,9 +20,10 @@ class CheckUpdateCommand extends BaseCommand
 
     public function configure(): void
     {
-        $this->addArgument('artifact', InputArgument::REQUIRED, 'The name of the artifact(s) to check for updates, comma-separated');
+        $this->addArgument('artifact', InputArgument::OPTIONAL, 'The name of the artifact(s) to check for updates, comma-separated (default: all downloaded artifacts)');
         $this->addOption('json', null, null, 'Output result in JSON format');
         $this->addOption('bare', null, null, 'Check update without requiring the artifact to be downloaded first (old version will be null)');
+        $this->addOption('parallel', 'p', InputOption::VALUE_REQUIRED, 'Number of parallel update checks (default: 10)', 10);
 
         // --with-php option for checking updates with a specific PHP version context
         $this->addOption('with-php', null, InputOption::VALUE_REQUIRED, 'PHP version in major.minor format (default 8.4)', '8.4');
@@ -27,17 +31,27 @@ class CheckUpdateCommand extends BaseCommand
 
     public function handle(): int
     {
-        $artifacts = parse_comma_list($this->input->getArgument('artifact'));
+        $artifact_arg = $this->input->getArgument('artifact');
+        if ($artifact_arg === null) {
+            $artifacts = ApplicationContext::get(ArtifactCache::class)->getCachedArtifactNames();
+            if (empty($artifacts)) {
+                $this->output->writeln('<comment>No downloaded artifacts found.</comment>');
+                return static::OK;
+            }
+        } else {
+            $artifacts = parse_comma_list($artifact_arg);
+        }
 
         try {
             $downloader = new ArtifactDownloader($this->input->getOptions());
             $bare = (bool) $this->getOption('bare');
             if ($this->getOption('json')) {
+                $results = $downloader->checkUpdates($artifacts, bare: $bare);
                 $outputs = [];
-                foreach ($artifacts as $artifact) {
-                    $result = $downloader->checkUpdate($artifact, bare: $bare);
+                foreach ($results as $artifact => $result) {
                     $outputs[$artifact] = [
                         'need-update' => $result->needUpdate,
+                        'unsupported' => $result->unsupported,
                         'old' => $result->old,
                         'new' => $result->new,
                     ];
@@ -45,15 +59,17 @@ class CheckUpdateCommand extends BaseCommand
                 $this->output->writeln(json_encode($outputs, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
                 return static::OK;
             }
-            foreach ($artifacts as $artifact) {
-                $result = $downloader->checkUpdate($artifact, bare: $bare);
-                if (!$result->needUpdate) {
-                    $this->output->writeln("Artifact <info>{$artifact}</info> is already up to date (<comment>{$result->new}</comment>)");
+            $downloader->checkUpdates($artifacts, bare: $bare, onResult: function (string $artifact, CheckUpdateResult $result) {
+                if ($result->unsupported) {
+                    $this->output->writeln("Artifact <info>{$artifact}</info> does not support update checking, <comment>skipped</comment>");
+                } elseif (!$result->needUpdate) {
+                    $ver = $result->new ? "(<comment>{$result->new}</comment>)" : '';
+                    $this->output->writeln("Artifact <info>{$artifact}</info> is already up to date {$ver}");
                 } else {
                     [$old, $new] = [$result->old ?? 'unavailable', $result->new ?? 'unknown'];
                     $this->output->writeln("Update available for <info>{$artifact}</info>: <comment>{$old}</comment> -> <comment>{$new}</comment>");
                 }
-            }
+            });
             return static::OK;
         } catch (SPCException $e) {
             $e->setSimpleOutput();
diff --git a/src/globals/defines.php b/src/globals/defines.php
index dbcb63f2..38490046 100644
--- a/src/globals/defines.php
+++ b/src/globals/defines.php
@@ -104,7 +104,7 @@ const SPC_DOWNLOAD_TYPE_DISPLAY_NAME = [
     'local' => 'local dir',
     'pie' => 'PHP Installer for Extensions (PIE)',
     'url' => 'url',
-    'php-release' => 'php.net',
+    'php-release' => 'PHP website release',
     'custom' => 'custom downloader',
 ];