diff --git a/src/Symfony/Component/Cache/Adapter/PdoAdapter.php b/src/Symfony/Component/Cache/Adapter/PdoAdapter.php
index b99c507abc6a2..54b1c9065c474 100644
--- a/src/Symfony/Component/Cache/Adapter/PdoAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/PdoAdapter.php
@@ -25,14 +25,14 @@ class PdoAdapter extends AbstractAdapter implements PruneableInterface
private string $dsn;
private string $driver;
private string $serverVersion;
- private mixed $table = 'cache_items';
- private mixed $idCol = 'item_id';
- private mixed $dataCol = 'item_data';
- private mixed $lifetimeCol = 'item_lifetime';
- private mixed $timeCol = 'item_time';
- private mixed $username = '';
- private mixed $password = '';
- private mixed $connectionOptions = [];
+ private string $table = 'cache_items';
+ private string $idCol = 'item_id';
+ private string $dataCol = 'item_data';
+ private string $lifetimeCol = 'item_lifetime';
+ private string $timeCol = 'item_time';
+ private ?string $username = '';
+ private ?string $password = '';
+ private array $connectionOptions = [];
private string $namespace;
/**
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