diff --git a/phpstan.neon b/phpstan.neon
index 42ea68c..473ba8d 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,5 +1,5 @@
 parameters:
-    level: 1
+    level: 9
     paths:
         - src
 
diff --git a/src/SpatieLaravelTranslatableContentDriver.php b/src/SpatieLaravelTranslatableContentDriver.php
index 52e4e97..897a728 100644
--- a/src/SpatieLaravelTranslatableContentDriver.php
+++ b/src/SpatieLaravelTranslatableContentDriver.php
@@ -18,6 +18,7 @@ public function __construct(protected string $activeLocale)
 
     public function isAttributeTranslatable(string $model, string $attribute): bool
     {
+        /** @var Model $model */
         $model = app($model);
 
         if (! method_exists($model, 'isTranslatableAttribute')) {
@@ -42,6 +43,7 @@ public function makeRecord(string $model, array $data): Model
             $record->getTranslatableAttributes() :
             [];
 
+        /** @var Model $record */
         $record->fill(Arr::except($data, $translatableAttributes));
 
         if (method_exists($record, 'setTranslation')) {
diff --git a/src/SpatieLaravelTranslatablePlugin.php b/src/SpatieLaravelTranslatablePlugin.php
index 63252f5..585a099 100644
--- a/src/SpatieLaravelTranslatablePlugin.php
+++ b/src/SpatieLaravelTranslatablePlugin.php
@@ -7,10 +7,7 @@
 
 class SpatieLaravelTranslatablePlugin implements Plugin
 {
-    /**
-     * @var array<string>
-     */
-    protected array $defaultLocales = [];
+    protected ?array $defaultLocales = [];
 
     protected ?Closure $getLocaleLabelUsing = null;
 
@@ -38,17 +35,11 @@ public function boot(Panel $panel): void
         //
     }
 
-    /**
-     * @return array<string>
-     */
-    public function getDefaultLocales(): array
+    public function getDefaultLocales(): ?array
     {
         return $this->defaultLocales;
     }
 
-    /**
-     * @param  array<string> | null  $defaultLocales
-     */
     public function defaultLocales(?array $defaultLocales = null): static
     {
         $this->defaultLocales = $defaultLocales;