diff --git a/src/Casts/CurrencyCast.php b/src/Casts/CurrencyCast.php
index 920b767..e191ad4 100644
--- a/src/Casts/CurrencyCast.php
+++ b/src/Casts/CurrencyCast.php
@@ -6,6 +6,10 @@
 use Illuminate\Contracts\Database\Eloquent\CastsAttributes;
 use UnexpectedValueException;
 
+/**
+ * @template TGet
+ * @template TSet
+ */
 class CurrencyCast implements CastsAttributes
 {
     public function get($model, string $key, $value, array $attributes): Currency
diff --git a/src/Casts/MoneyCast.php b/src/Casts/MoneyCast.php
index 7286a7c..2ed636c 100644
--- a/src/Casts/MoneyCast.php
+++ b/src/Casts/MoneyCast.php
@@ -7,6 +7,10 @@
 use Illuminate\Contracts\Database\Eloquent\CastsAttributes;
 use UnexpectedValueException;
 
+/**
+ * @template TGet
+ * @template TSet
+ */
 class MoneyCast implements CastsAttributes
 {
     public function get($model, string $key, $value, array $attributes): Money
diff --git a/src/Rules/CurrencyRule.php b/src/Rules/CurrencyRule.php
index fc79fde..3ced7a2 100644
--- a/src/Rules/CurrencyRule.php
+++ b/src/Rules/CurrencyRule.php
@@ -15,7 +15,7 @@ public function validate(string $attribute, mixed $value, Closure $fail): void
         }
     }
 
-    protected function passes($value): bool
+    protected function passes(mixed $value): bool
     {
         return is_string($value) && array_key_exists(strtoupper($value), Currency::getCurrencies());
     }