diff --git a/src/StaticPHP/Artifact/Artifact.php b/src/StaticPHP/Artifact/Artifact.php
index 8bdd86a8..841775e3 100644
--- a/src/StaticPHP/Artifact/Artifact.php
+++ b/src/StaticPHP/Artifact/Artifact.php
@@ -27,6 +27,9 @@ class Artifact
     /** @var null|callable Bind custom source fetcher callback */
     protected mixed $custom_source_callback = null;
 
+    /** @var null|callable Bind custom source check-update callback */
+    protected mixed $custom_source_check_update_callback = null;
+
     /** @var array<string, callable> Bind custom binary fetcher callbacks */
     protected mixed $custom_binary_callbacks = [];
 
@@ -408,6 +411,19 @@ class Artifact
         return $this->custom_source_callback ?? null;
     }
 
+    /**
+     * Set custom source check-update callback.
+     */
+    public function setCustomSourceCheckUpdateCallback(callable $callback): void
+    {
+        $this->custom_source_check_update_callback = $callback;
+    }
+
+    public function getCustomSourceCheckUpdateCallback(): ?callable
+    {
+        return $this->custom_source_check_update_callback ?? null;
+    }
+
     public function getCustomBinaryCallback(): ?callable
     {
         $current_platform = SystemTarget::getCurrentPlatformString();
diff --git a/src/StaticPHP/Artifact/ArtifactDownloader.php b/src/StaticPHP/Artifact/ArtifactDownloader.php
index 219dfb8b..86c06c19 100644
--- a/src/StaticPHP/Artifact/ArtifactDownloader.php
+++ b/src/StaticPHP/Artifact/ArtifactDownloader.php
@@ -332,17 +332,14 @@ class ArtifactDownloader
             throw new WrongUsageException("Artifact '{$artifact_name}' not found, please check the name.");
         }
         if ($bare) {
-            $config = $artifact->getDownloadConfig('source');
-            if (!is_array($config)) {
-                throw new WrongUsageException("Artifact '{$artifact_name}' has no source config for bare update check.");
+            [$first, $second] = $prefer_source
+                ? [fn () => $this->probeSourceCheckUpdate($artifact, $artifact_name), fn () => $this->probeBinaryCheckUpdate($artifact, $artifact_name)]
+                : [fn () => $this->probeBinaryCheckUpdate($artifact, $artifact_name), fn () => $this->probeSourceCheckUpdate($artifact, $artifact_name)];
+            $result = $first() ?? $second();
+            if ($result !== null) {
+                return $result;
             }
-            $cls = $this->downloaders[$config['type']] ?? null;
-            if (!is_a($cls, CheckUpdateInterface::class, true)) {
-                throw new WrongUsageException("Artifact '{$artifact_name}' downloader does not support update checking.");
-            }
-            /** @var CheckUpdateInterface $downloader */
-            $downloader = new $cls();
-            return $downloader->checkUpdate($artifact_name, $config, null, $this);
+            throw new WrongUsageException("Artifact '{$artifact_name}' downloader does not support update checking.");
         }
         $cache = ApplicationContext::get(ArtifactCache::class);
         if ($prefer_source) {
@@ -358,7 +355,15 @@ class ArtifactDownloader
             /** @var CheckUpdateInterface $downloader */
             $downloader = new $cls();
             return $downloader->checkUpdate($artifact_name, $info['config'], $info['version'], $this);
-        }        // custom binary: delegate to registered check-update callback
+        }
+        // custom source: delegate to registered check-update callback
+        if (($info['lock_type'] ?? null) === 'source' && ($callback = $artifact->getCustomSourceCheckUpdateCallback()) !== null) {
+            return ApplicationContext::invoke($callback, [
+                ArtifactDownloader::class => $this,
+                'old_version' => $info['version'],
+            ]);
+        }
+        // custom binary: delegate to registered check-update callback
         if (($callback = $artifact->getCustomBinaryCheckUpdateCallback()) !== null) {
             return ApplicationContext::invoke($callback, [
                 ArtifactDownloader::class => $this,
@@ -383,6 +388,50 @@ class ArtifactDownloader
         return $this->options[$name] ?? $default;
     }
 
+    private function probeSourceCheckUpdate(Artifact $artifact, string $artifact_name): ?CheckUpdateResult
+    {
+        if (($callback = $artifact->getCustomSourceCheckUpdateCallback()) !== null) {
+            return ApplicationContext::invoke($callback, [
+                ArtifactDownloader::class => $this,
+                'old_version' => null,
+            ]);
+        }
+        $config = $artifact->getDownloadConfig('source');
+        if (!is_array($config)) {
+            return null;
+        }
+        $cls = $this->downloaders[$config['type']] ?? null;
+        if (!is_a($cls, CheckUpdateInterface::class, true)) {
+            return null;
+        }
+        /** @var CheckUpdateInterface $dl */
+        $dl = new $cls();
+        return $dl->checkUpdate($artifact_name, $config, null, $this);
+    }
+
+    private function probeBinaryCheckUpdate(Artifact $artifact, string $artifact_name): ?CheckUpdateResult
+    {
+        // custom binary callback takes precedence over config-based binary
+        if (($callback = $artifact->getCustomBinaryCheckUpdateCallback()) !== null) {
+            return ApplicationContext::invoke($callback, [
+                ArtifactDownloader::class => $this,
+                'old_version' => null,
+            ]);
+        }
+        $binary_config = $artifact->getDownloadConfig('binary');
+        $platform_config = is_array($binary_config) ? ($binary_config[SystemTarget::getCurrentPlatformString()] ?? null) : null;
+        if (!is_array($platform_config)) {
+            return null;
+        }
+        $cls = $this->downloaders[$platform_config['type']] ?? null;
+        if (!is_a($cls, CheckUpdateInterface::class, true)) {
+            return null;
+        }
+        /** @var CheckUpdateInterface $dl */
+        $dl = new $cls();
+        return $dl->checkUpdate($artifact_name, $platform_config, null, $this);
+    }
+
     private function downloadWithType(Artifact $artifact, int $current, int $total, bool $parallel = false, bool $interactive = true): int
     {
         $queue = $this->generateQueue($artifact);
diff --git a/src/StaticPHP/Attribute/Artifact/CustomSourceCheckUpdate.php b/src/StaticPHP/Attribute/Artifact/CustomSourceCheckUpdate.php
new file mode 100644
index 00000000..df6e07d6
--- /dev/null
+++ b/src/StaticPHP/Attribute/Artifact/CustomSourceCheckUpdate.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace StaticPHP\Attribute\Artifact;
+
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::IS_REPEATABLE)]
+class CustomSourceCheckUpdate
+{
+    public function __construct(public string $artifact_name) {}
+}
diff --git a/src/StaticPHP/Registry/ArtifactLoader.php b/src/StaticPHP/Registry/ArtifactLoader.php
index 45252a13..ed4ef1e7 100644
--- a/src/StaticPHP/Registry/ArtifactLoader.php
+++ b/src/StaticPHP/Registry/ArtifactLoader.php
@@ -11,6 +11,7 @@ use StaticPHP\Attribute\Artifact\BinaryExtract;
 use StaticPHP\Attribute\Artifact\CustomBinary;
 use StaticPHP\Attribute\Artifact\CustomBinaryCheckUpdate;
 use StaticPHP\Attribute\Artifact\CustomSource;
+use StaticPHP\Attribute\Artifact\CustomSourceCheckUpdate;
 use StaticPHP\Attribute\Artifact\SourceExtract;
 use StaticPHP\Config\ArtifactConfig;
 use StaticPHP\Exception\ValidationException;
@@ -62,6 +63,7 @@ class ArtifactLoader
 
         foreach ($ref->getMethods(\ReflectionMethod::IS_PUBLIC) as $method) {
             self::processCustomSourceAttribute($ref, $method, $class_instance);
+            self::processCustomSourceCheckUpdateAttribute($ref, $method, $class_instance);
             self::processCustomBinaryAttribute($ref, $method, $class_instance);
             self::processCustomBinaryCheckUpdateAttribute($ref, $method, $class_instance);
             self::processSourceExtractAttribute($ref, $method, $class_instance);
@@ -100,6 +102,24 @@ class ArtifactLoader
         }
     }
 
+    /**
+     * Process #[CustomSourceCheckUpdate] attribute.
+     */
+    private static function processCustomSourceCheckUpdateAttribute(\ReflectionClass $ref, \ReflectionMethod $method, object $class_instance): void
+    {
+        $attributes = $method->getAttributes(CustomSourceCheckUpdate::class);
+        foreach ($attributes as $attribute) {
+            /** @var CustomSourceCheckUpdate $instance */
+            $instance = $attribute->newInstance();
+            $artifact_name = $instance->artifact_name;
+            if (isset(self::$artifacts[$artifact_name])) {
+                self::$artifacts[$artifact_name]->setCustomSourceCheckUpdateCallback([$class_instance, $method->getName()]);
+            } else {
+                throw new ValidationException("Artifact '{$artifact_name}' not found for #[CustomSourceCheckUpdate] on '{$ref->getName()}::{$method->getName()}'");
+            }
+        }
+    }
+
     /**
      * Process #[CustomBinary] attribute.
      */