diff --git a/.github/workflows/psalm.yml b/.github/workflows/psalm.yml
index 7be48f26..3d29b70e 100644
--- a/.github/workflows/psalm.yml
+++ b/.github/workflows/psalm.yml
@@ -2,6 +2,9 @@
 #
 # https://github.com/nextcloud/.github
 # https://docs.github.com/en/actions/learn-github-actions/sharing-workflows-with-your-organization
+#
+# SPDX-FileCopyrightText: 2022-2024 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: MIT
 
 name: Static analysis
 
@@ -17,6 +20,9 @@ concurrency:
   group: psalm-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   static-analysis:
     runs-on: ubuntu-latest
@@ -32,6 +38,8 @@ jobs:
           php-version: 8.1
           coverage: none
           ini-file: development
+          # Temporary workaround for missing pcntl_* in PHP 8.3
+          ini-values: disable_functions=
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
@@ -39,4 +47,4 @@ jobs:
         run: composer i
 
       - name: Run coding standards check
-        run: composer run psalm
+        run: composer run psalm -- --threads=1 --monochrome --no-progress --output-format=github
diff --git a/index.php b/index.php
index 24aad88c..4a16553e 100644
--- a/index.php
+++ b/index.php
@@ -553,11 +553,9 @@ private function getUpdateServerResponse() {
 	 *
 	 * @throws \Exception
 	 */
-	public function downloadUpdate() {
+	public function downloadUpdate(?string $url = null) {
 		$this->silentLog('[info] downloadUpdate()');
 
-		$response = $this->getUpdateServerResponse();
-
 		$storageLocation = $this->getUpdateDirectoryLocation() . '/updater-'.$this->getConfigOption('instanceid') . '/downloads/';
 		if (file_exists($storageLocation)) {
 			$this->silentLog('[info] storage location exists');
@@ -568,8 +566,26 @@ public function downloadUpdate() {
 			throw new \Exception('Could not mkdir storage location');
 		}
 
-		$fp = fopen($storageLocation . basename($response['url']), 'w+');
-		$ch = curl_init($response['url']);
+		$downloadURL = '';
+		if ($url) {
+			// If a URL is provided, use it directly
+			$downloadURL = $url;
+		} else {
+			// Otherwise, get the download URLs from the update server
+			$response = $this->getUpdateServerResponse();
+
+			if (!isset($response['url']) || !is_string($response['url'])) {
+				throw new \Exception('Response from update server is missing url');
+			}
+			$downloadURL = $response['url'];
+		}
+
+		if (!$downloadURL) {
+			throw new \Exception('No download URL provided or available from update server');
+		}
+
+		$fp = fopen($storageLocation . basename($downloadURL), 'w+');
+		$ch = curl_init($downloadURL);
 		curl_setopt_array($ch, [
 			CURLOPT_FILE => $fp,
 			CURLOPT_USERAGENT => 'Nextcloud Updater',
@@ -611,7 +627,7 @@ public function downloadUpdate() {
 				$message .= ' - curl error message: ' . $curlErrorMessage;
 			}
 
-			$message .= ' - URL: ' . htmlentities($response['url']);
+			$message .= ' - URL: ' . htmlentities($downloadURL);
 
 			throw new \Exception($message);
 		}
@@ -645,7 +661,7 @@ private function getDownloadedFilePath() {
 	 *
 	 * @throws \Exception
 	 */
-	public function verifyIntegrity() {
+	public function verifyIntegrity(?string $urlOverride = null): void {
 		$this->silentLog('[info] verifyIntegrity()');
 
 		if ($this->getCurrentReleaseChannel() === 'daily') {
@@ -653,6 +669,11 @@ public function verifyIntegrity() {
 			return;
 		}
 
+		if ($urlOverride) {
+			$this->silentLog('[info] custom download url provided, cannot verify signature');
+			return;
+		}
+
 		$response = $this->getUpdateServerResponse();
 		if (empty($response['signature'])) {
 			throw new \Exception('No signature specified for defined update');
diff --git a/lib/UpdateCommand.php b/lib/UpdateCommand.php
index 9a438cd9..65aedc73 100644
--- a/lib/UpdateCommand.php
+++ b/lib/UpdateCommand.php
@@ -41,6 +41,7 @@ class UpdateCommand extends Command {
 	protected $skipBackup = false;
 
 	protected bool $skipUpgrade = false;
+	protected string $urlOverride = '';
 
 	/** @var array strings of text for stages of updater */
 	protected $checkTexts = [
@@ -65,7 +66,8 @@ protected function configure() {
 			->setDescription('Updates the code of an Nextcloud instance')
 			->setHelp("This command fetches the latest code that is announced via the updater server and safely replaces the existing code with the new one.")
 			->addOption('no-backup', null, InputOption::VALUE_NONE, 'Skip backup of current Nextcloud version')
-			->addOption('no-upgrade', null, InputOption::VALUE_NONE, "Don't automatically run occ upgrade");
+			->addOption('no-upgrade', null, InputOption::VALUE_NONE, "Don't automatically run occ upgrade")
+			->addOption('url', null, InputOption::VALUE_OPTIONAL, 'The URL of the Nextcloud release to download');
 	}
 
 	public static function getUpdaterVersion(): string {
@@ -78,8 +80,9 @@ public static function getUpdaterVersion(): string {
 	}
 
 	protected function execute(InputInterface $input, OutputInterface $output) {
-		$this->skipBackup = $input->getOption('no-backup');
-		$this->skipUpgrade = $input->getOption('no-upgrade');
+		$this->skipBackup = (bool)$input->getOption('no-backup');
+		$this->skipUpgrade = (bool)$input->getOption('no-upgrade');
+		$this->urlOverride = (string)$input->getOption('url');
 
 		$version = static::getUpdaterVersion();
 		$output->writeln('Nextcloud Updater - version: ' . $version);
@@ -152,7 +155,12 @@ protected function execute(InputInterface $input, OutputInterface $output) {
 		$output->writeln('Current version is ' . $this->updater->getCurrentVersion() . '.');
 
 		// needs to be called that early because otherwise updateAvailable() returns false
-		$updateString = $this->updater->checkForUpdate();
+		if ($this->urlOverride) {
+			$this->updater->log('[info] Using URL override: ' . $this->urlOverride);
+			$updateString = 'Update check forced with URL override: ' . $this->urlOverride;
+		} else {
+			$updateString = $this->updater->checkForUpdate();
+		}
 
 		$output->writeln('');
 
@@ -165,9 +173,11 @@ protected function execute(InputInterface $input, OutputInterface $output) {
 
 		$output->writeln('');
 
-		if (!$this->updater->updateAvailable() && $stepNumber === 0) {
-			$output->writeln('Nothing to do.');
-			return 0;
+		if (!$this->urlOverride) {
+			if (!$this->updater->updateAvailable() && $stepNumber === 0) {
+				$output->writeln('Nothing to do.');
+				return 0;
+			}
 		}
 
 		$questionText = 'Start update';
@@ -374,10 +384,10 @@ protected function executeStep($step) {
 					}
 					break;
 				case 4:
-					$this->updater->downloadUpdate();
+					$this->updater->downloadUpdate($this->urlOverride);
 					break;
 				case 5:
-					$this->updater->verifyIntegrity();
+					$this->updater->verifyIntegrity($this->urlOverride);
 					break;
 				case 6:
 					$this->updater->extractDownload();
diff --git a/lib/Updater.php b/lib/Updater.php
index 06f65e8b..16e3a721 100644
--- a/lib/Updater.php
+++ b/lib/Updater.php
@@ -517,11 +517,9 @@ private function getUpdateServerResponse() {
 	 *
 	 * @throws \Exception
 	 */
-	public function downloadUpdate() {
+	public function downloadUpdate(?string $url = null) {
 		$this->silentLog('[info] downloadUpdate()');
 
-		$response = $this->getUpdateServerResponse();
-
 		$storageLocation = $this->getUpdateDirectoryLocation() . '/updater-'.$this->getConfigOption('instanceid') . '/downloads/';
 		if (file_exists($storageLocation)) {
 			$this->silentLog('[info] storage location exists');
@@ -532,8 +530,26 @@ public function downloadUpdate() {
 			throw new \Exception('Could not mkdir storage location');
 		}
 
-		$fp = fopen($storageLocation . basename($response['url']), 'w+');
-		$ch = curl_init($response['url']);
+		$downloadURL = '';
+		if ($url) {
+			// If a URL is provided, use it directly
+			$downloadURL = $url;
+		} else {
+			// Otherwise, get the download URLs from the update server
+			$response = $this->getUpdateServerResponse();
+
+			if (!isset($response['url']) || !is_string($response['url'])) {
+				throw new \Exception('Response from update server is missing url');
+			}
+			$downloadURL = $response['url'];
+		}
+
+		if (!$downloadURL) {
+			throw new \Exception('No download URL provided or available from update server');
+		}
+
+		$fp = fopen($storageLocation . basename($downloadURL), 'w+');
+		$ch = curl_init($downloadURL);
 		curl_setopt_array($ch, [
 			CURLOPT_FILE => $fp,
 			CURLOPT_USERAGENT => 'Nextcloud Updater',
@@ -575,7 +591,7 @@ public function downloadUpdate() {
 				$message .= ' - curl error message: ' . $curlErrorMessage;
 			}
 
-			$message .= ' - URL: ' . htmlentities($response['url']);
+			$message .= ' - URL: ' . htmlentities($downloadURL);
 
 			throw new \Exception($message);
 		}
@@ -609,7 +625,7 @@ private function getDownloadedFilePath() {
 	 *
 	 * @throws \Exception
 	 */
-	public function verifyIntegrity() {
+	public function verifyIntegrity(?string $urlOverride = null): void {
 		$this->silentLog('[info] verifyIntegrity()');
 
 		if ($this->getCurrentReleaseChannel() === 'daily') {
@@ -617,6 +633,11 @@ public function verifyIntegrity() {
 			return;
 		}
 
+		if ($urlOverride) {
+			$this->silentLog('[info] custom download url provided, cannot verify signature');
+			return;
+		}
+
 		$response = $this->getUpdateServerResponse();
 		if (empty($response['signature'])) {
 			throw new \Exception('No signature specified for defined update');
diff --git a/updater.phar b/updater.phar
index e406bfe0..7f43af10 100755
Binary files a/updater.phar and b/updater.phar differ
diff --git a/vendor/autoload.php b/vendor/autoload.php
index e97f2aed..f52071e9 100644
--- a/vendor/autoload.php
+++ b/vendor/autoload.php
@@ -14,10 +14,7 @@
             echo $err;
         }
     }
-    trigger_error(
-        $err,
-        E_USER_ERROR
-    );
+    throw new RuntimeException($err);
 }
 
 require_once __DIR__ . '/composer/autoload_real.php';
diff --git a/vendor/composer/InstalledVersions.php b/vendor/composer/InstalledVersions.php
index 51e734a7..2052022f 100644
--- a/vendor/composer/InstalledVersions.php
+++ b/vendor/composer/InstalledVersions.php
@@ -26,12 +26,23 @@
  */
 class InstalledVersions
 {
+    /**
+     * @var string|null if set (by reflection by Composer), this should be set to the path where this class is being copied to
+     * @internal
+     */
+    private static $selfDir = null;
+
     /**
      * @var mixed[]|null
      * @psalm-var array{root: array{name: string, pretty_version: string, version: string, reference: string|null, type: string, install_path: string, aliases: string[], dev: bool}, versions: array<string, array{pretty_version?: string, version?: string, reference?: string|null, type?: string, install_path?: string, aliases?: string[], dev_requirement: bool, replaced?: string[], provided?: string[]}>}|array{}|null
      */
     private static $installed;
 
+    /**
+     * @var bool
+     */
+    private static $installedIsLocalDir;
+
     /**
      * @var bool|null
      */
@@ -309,6 +320,24 @@ public static function reload($data)
     {
         self::$installed = $data;
         self::$installedByVendor = array();
+
+        // when using reload, we disable the duplicate protection to ensure that self::$installed data is
+        // always returned, but we cannot know whether it comes from the installed.php in __DIR__ or not,
+        // so we have to assume it does not, and that may result in duplicate data being returned when listing
+        // all installed packages for example
+        self::$installedIsLocalDir = false;
+    }
+
+    /**
+     * @return string
+     */
+    private static function getSelfDir()
+    {
+        if (self::$selfDir === null) {
+            self::$selfDir = strtr(__DIR__, '\\', '/');
+        }
+
+        return self::$selfDir;
     }
 
     /**
@@ -322,19 +351,27 @@ private static function getInstalled()
         }
 
         $installed = array();
+        $copiedLocalDir = false;
 
         if (self::$canGetVendors) {
+            $selfDir = self::getSelfDir();
             foreach (ClassLoader::getRegisteredLoaders() as $vendorDir => $loader) {
+                $vendorDir = strtr($vendorDir, '\\', '/');
                 if (isset(self::$installedByVendor[$vendorDir])) {
                     $installed[] = self::$installedByVendor[$vendorDir];
                 } elseif (is_file($vendorDir.'/composer/installed.php')) {
                     /** @var array{root: array{name: string, pretty_version: string, version: string, reference: string|null, type: string, install_path: string, aliases: string[], dev: bool}, versions: array<string, array{pretty_version?: string, version?: string, reference?: string|null, type?: string, install_path?: string, aliases?: string[], dev_requirement: bool, replaced?: string[], provided?: string[]}>} $required */
                     $required = require $vendorDir.'/composer/installed.php';
-                    $installed[] = self::$installedByVendor[$vendorDir] = $required;
-                    if (null === self::$installed && strtr($vendorDir.'/composer', '\\', '/') === strtr(__DIR__, '\\', '/')) {
-                        self::$installed = $installed[count($installed) - 1];
+                    self::$installedByVendor[$vendorDir] = $required;
+                    $installed[] = $required;
+                    if (self::$installed === null && $vendorDir.'/composer' === $selfDir) {
+                        self::$installed = $required;
+                        self::$installedIsLocalDir = true;
                     }
                 }
+                if (self::$installedIsLocalDir && $vendorDir.'/composer' === $selfDir) {
+                    $copiedLocalDir = true;
+                }
             }
         }
 
@@ -350,7 +387,7 @@ private static function getInstalled()
             }
         }
 
-        if (self::$installed !== array()) {
+        if (self::$installed !== array() && !$copiedLocalDir) {
             $installed[] = self::$installed;
         }
 
diff --git a/vendor/composer/installed.php b/vendor/composer/installed.php
index de5be70d..d0a887f5 100644
--- a/vendor/composer/installed.php
+++ b/vendor/composer/installed.php
@@ -3,7 +3,7 @@
         'name' => '__root__',
         'pretty_version' => 'dev-master',
         'version' => 'dev-master',
-        'reference' => 'b3b17cf837de98718ef2bc2277fbc1db24f4288f',
+        'reference' => '1ed21d3dfe750ed9fc1ebe42927b1a0955a42c27',
         'type' => 'library',
         'install_path' => __DIR__ . '/../../',
         'aliases' => array(),
@@ -13,7 +13,7 @@
         '__root__' => array(
             'pretty_version' => 'dev-master',
             'version' => 'dev-master',
-            'reference' => 'b3b17cf837de98718ef2bc2277fbc1db24f4288f',
+            'reference' => '1ed21d3dfe750ed9fc1ebe42927b1a0955a42c27',
             'type' => 'library',
             'install_path' => __DIR__ . '/../../',
             'aliases' => array(),
diff --git a/vendor/composer/platform_check.php b/vendor/composer/platform_check.php
index 580fa960..d2225c7d 100644
--- a/vendor/composer/platform_check.php
+++ b/vendor/composer/platform_check.php
@@ -19,8 +19,7 @@
             echo 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . str_replace('You are running '.PHP_VERSION.'.', '', implode(PHP_EOL, $issues)) . PHP_EOL.PHP_EOL;
         }
     }
-    trigger_error(
-        'Composer detected issues in your platform: ' . implode(' ', $issues),
-        E_USER_ERROR
+    throw new \RuntimeException(
+        'Composer detected issues in your platform: ' . implode(' ', $issues)
     );
 }