diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index df4f561840..019f8b6bf6 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -528,7 +528,7 @@ function is_serialized( $data, $strict = true ) {
 		case 'i':
 		case 'd':
 			$end = $strict ? '$' : '';
-			return (bool) preg_match( "/^{$token}:[0-9.E-]+;$end/", $data );
+			return (bool) preg_match( "/^{$token}:[0-9.E+-]+;$end/", $data );
 	}
 	return false;
 }
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 419523cb78..769f14bdc7 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45753';
+$wp_version = '5.3-alpha-45754';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.