diff --git a/composer.json b/composer.json
index f695b063..cd0addb2 100644
--- a/composer.json
+++ b/composer.json
@@ -114,7 +114,7 @@
         ],
         "cs": "phpcs -s",
         "cs:fix": "phpcbf",
-        "stan": "APP_ENV=test php vendor/bin/phpstan analyse module/*/src module/*/test* module/*/config module/*/migrations config docker/config --level=8",
+        "stan": "APP_ENV=test php vendor/bin/phpstan analyse",
         "test": [
             "@parallel test:unit test:db",
             "@parallel test:api test:cli"
diff --git a/module/Core/functions/functions.php b/module/Core/functions/functions.php
index 720f27c1..160ba35e 100644
--- a/module/Core/functions/functions.php
+++ b/module/Core/functions/functions.php
@@ -109,7 +109,7 @@ function normalizeLocale(string $locale): string
  * minimum quality
  *
  * @param non-empty-string $acceptLanguage
- * @param float<0, 1> $minQuality
+ * @param float $minQuality
  * @return iterable<string>;
  */
 function acceptLanguageToLocales(string $acceptLanguage, float $minQuality = 0): iterable
@@ -142,21 +142,31 @@ function acceptLanguageToLocales(string $acceptLanguage, float $minQuality = 0):
  */
 function splitLocale(string $locale): array
 {
-    return array_pad(explode('-', $locale), length: 2, value: null);
+    [$lang, $countryCode] = array_pad(explode('-', $locale), length: 2, value: null);
+    return [$lang, $countryCode];
 }
 
+/**
+ * @param InputFilter<mixed> $inputFilter
+ */
 function getOptionalIntFromInputFilter(InputFilter $inputFilter, string $fieldName): ?int
 {
     $value = $inputFilter->getValue($fieldName);
     return $value !== null ? (int) $value : null;
 }
 
+/**
+ * @param InputFilter<mixed> $inputFilter
+ */
 function getOptionalBoolFromInputFilter(InputFilter $inputFilter, string $fieldName): ?bool
 {
     $value = $inputFilter->getValue($fieldName);
     return $value !== null ? (bool) $value : null;
 }
 
+/**
+ * @param InputFilter<mixed> $inputFilter
+ */
 function getNonEmptyOptionalValueFromInputFilter(InputFilter $inputFilter, string $fieldName): mixed
 {
     $value = $inputFilter->getValue($fieldName);
diff --git a/phpstan.neon b/phpstan.neon
index 7e21a038..72c5ea6d 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -4,6 +4,11 @@ includes:
     - vendor/phpstan/phpstan-phpunit/extension.neon
     - vendor/phpstan/phpstan-phpunit/rules.neon
 parameters:
+    level: 8
+    paths:
+        - module
+        - config
+        - docker/config
     symfony:
         console_application_loader: 'config/cli-app.php'
     doctrine: