diff --git a/build/config_builder b/build/config_builder
index bd62e173..743abd6a 100755
--- a/build/config_builder
+++ b/build/config_builder
@@ -49,19 +49,20 @@ foreach ($releases as $releaseName => $info) {
 	];
 
 	// Check if we can upgrade from a previous major version
+	$previousMajor = $major - 1;
 	$deployPercent = $info['deploy'] ?? 100;
-	if (isset($latestReleases[$stability][$major - 1])) {
-		$upgradeFrom = $latestReleases[$stability][$major - 1];
+	if (isset($latestReleases[$stability][$previousMajor])) {
+		$upgradeFrom = $latestReleases[$stability][$previousMajor];
 		$generatedConfig[$stability][$upgradeFrom][$deployPercent] = $generatedConfig[$stability][$major]['100'];
 	} elseif (isset($latestReleases['stable'][$major -1])) {
-		$upgradeFrom = $latestReleases['stable'][$major - 1];
+		$upgradeFrom = $latestReleases['stable'][$previousMajor];
 		$generatedConfig[$stability][$upgradeFrom][$deployPercent] = $generatedConfig[$stability][$major]['100'];
 	}
 
 	// For stable versions, check if we can upgrade from a beta version
 	if ($stability === 'stable') {
-		if (isset($latestReleases['beta'][$major - 1])) {
-			$upgradeFrom = $latestReleases[$stability][$major - 1];
+		if (isset($latestReleases['beta'][$previousMajor])) {
+			$upgradeFrom = $latestReleases['beta'][$previousMajor];
 			$generatedConfig['beta'][$upgradeFrom][100] = $generatedConfig[$stability][$major]['100'];
 		}
 	}
diff --git a/config/config.php b/config/config.php
index 9aa17fd0..a5ba83c9 100755
--- a/config/config.php
+++ b/config/config.php
@@ -644,7 +644,7 @@
 		],
 	],
 	'beta' => [
-		'27.1.9.1' => [
+		'27.1.10.0' => [
 			100 => [
 				'latest' => '28.0.6',
 				'internalVersion' => '28.0.6.1',