diff --git a/lib/private/Updater.php b/lib/private/Updater.php
index 78613ddbb0c28..cbe152db70ab8 100644
--- a/lib/private/Updater.php
+++ b/lib/private/Updater.php
@@ -40,6 +40,7 @@
  */
 namespace OC;
 
+use Composer\Semver\Semver;
 use OCP\App\IAppManager;
 use OCP\EventDispatcher\Event;
 use OCP\EventDispatcher\IEventDispatcher;
@@ -138,6 +139,9 @@ public function upgrade(): bool {
 
 		$success = true;
 		try {
+			if (PHP_INT_SIZE < 8 && Semver::satisfies($currentVersion, '> 25')) {
+				throw new HintException('You are running a 32-bit PHP version. Cannot upgrade to Nextcloud 26 and higher. Please switch to 64-bit PHP.');
+			}
 			$this->doUpgrade($currentVersion, $installedVersion);
 		} catch (HintException $exception) {
 			$this->log->error($exception->getMessage(), [