diff --git a/src/Services/UpgradeService.php b/src/Services/UpgradeService.php
index 8f9f98c5..91f4586e 100644
--- a/src/Services/UpgradeService.php
+++ b/src/Services/UpgradeService.php
@@ -10,7 +10,7 @@ final class UpgradeService
 	private $config;
 	private $upgrades;
 	private $databaseConnection;
-	private $executedUpgradeNames = [];
+	private $executedUpgradeNumbers = [];
 
 	public function __construct(
 		Config $config,
@@ -20,7 +20,7 @@ final class UpgradeService
 		$this->config = $config;
 		$this->databaseConnection = $databaseConnection;
 		$this->upgrades = $upgradeRepository->getUpgrades();
-		$this->loadExecutedUpgradeNames();
+		$this->loadExecutedUpgradeNumbers();
 	}
 
 	public function runUpgradesVerbose()
@@ -48,32 +48,37 @@ final class UpgradeService
 
 	private function isUpgradeNeeded(IUpgrade $upgrade)
 	{
-		return !in_array(get_class($upgrade), $this->executedUpgradeNames);
+		return !in_array($this->getUpgradeNumber($upgrade), $this->executedUpgradeNumbers);
 	}
 
 	private function runUpgrade(IUpgrade $upgrade)
 	{
 		$upgrade->run($this->databaseConnection);
-		$this->executedUpgradeNames[] = get_class($upgrade);
-		$this->saveExecutedUpgradeNames();
+		$number = $this->getUpgradeNumber($upgrade);
+		$this->executedUpgradeNumbers[] = $number;
+		$this->databaseConnection->getPDO()->insertInto('executedUpgrades')->values(['number' => $number])->execute();
 	}
 
-	private function loadExecutedUpgradeNames()
+	private function loadExecutedUpgradeNumbers()
 	{
-		$infoFilePath = $this->getExecutedUpgradeNamesFilePath();
-		if (!file_exists($infoFilePath))
-			return;
-		$this->executedUpgradeNames = explode("\n", file_get_contents($infoFilePath));
+		$this->executedUpgradeNumbers = [];
+		try
+		{
+			foreach ($this->databaseConnection->getPDO()->from('executedUpgrades') as $row)
+			{
+				$this->executedUpgradeNumbers[] = intval($row['number']);
+			}
+		}
+		catch (\Exception $e)
+		{
+			//most probably, no table found - need to execute all upgrades
+		}
 	}
 
-	private function saveExecutedUpgradeNames()
+	private function getUpgradeNumber(IUpgrade $upgrade)
 	{
-		$infoFilePath = $this->getExecutedUpgradeNamesFilePath();
-		file_put_contents($infoFilePath, implode("\n", $this->executedUpgradeNames));
-	}
-
-	private function getExecutedUpgradeNamesFilePath()
-	{
-		return $this->config->getDataDirectory() . DIRECTORY_SEPARATOR . 'executed_upgrades.txt';
+		$className = get_class($upgrade);
+		preg_match('/(\d+)/', $className, $matches);
+		return intval($matches[1]);
 	}
 }
diff --git a/src/Upgrades/Upgrade00.php b/src/Upgrades/Upgrade00.php
new file mode 100644
index 00000000..3b06be63
--- /dev/null
+++ b/src/Upgrades/Upgrade00.php
@@ -0,0 +1,26 @@
+<?php
+namespace Szurubooru\Upgrades;
+use Szurubooru\DatabaseConnection;
+
+class Upgrade00 implements IUpgrade
+{
+	public function run(DatabaseConnection $databaseConnection)
+	{
+		$pdo = $databaseConnection->getPDO();
+		$pdo->exec('CREATE TABLE executedUpgrades (number INT NOT NULL)');
+
+		$oldFilePath = __DIR__ . '/../../data/executed_upgrades.txt';
+		if (file_exists($oldFilePath))
+		{
+			foreach (explode("\n", file_get_contents($oldFilePath)) as $className)
+			{
+				if (preg_match('/(\d+)/', $className, $matches))
+				{
+					$number = intval($matches[1]);
+					$pdo->insertInto('executedUpgrades')->values(['number' => $number])->execute();
+				}
+			}
+			unlink($oldFilePath);
+		}
+	}
+}
diff --git a/src/di.php b/src/di.php
index 80853591..7e1fa66a 100644
--- a/src/di.php
+++ b/src/di.php
@@ -16,6 +16,7 @@ return [
 
 	'upgrades' => DI\factory(function (DI\container $container) {
 		return [
+			$container->get(\Szurubooru\Upgrades\Upgrade00::class),
 			$container->get(\Szurubooru\Upgrades\Upgrade01::class),
 			$container->get(\Szurubooru\Upgrades\Upgrade02::class),
 			$container->get(\Szurubooru\Upgrades\Upgrade03::class),