diff --git a/phpstan.neon b/phpstan.neon
index 63aadba..46b0f47 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,5 +1,5 @@
 parameters:
-    level: 6
+    level: 5
     paths:
         - src
         - tests
diff --git a/src/Exceptions/CantonException.php b/src/Exceptions/CantonException.php
index 7b49ef4..e390ac4 100644
--- a/src/Exceptions/CantonException.php
+++ b/src/Exceptions/CantonException.php
@@ -8,16 +8,19 @@ class CantonException extends Exception
 {
     public static function notFoundForAbbreviation(string $abbreviation): self
     {
+        /** @phpstan-ignore-next-line */
         return new static("Couldn't find Canton for given abbreviation: {$abbreviation}");
     }
 
     public static function notFoundForName(string $name): self
     {
+        /** @phpstan-ignore-next-line */
         return new static("Couldn't find Canton for given name: {$name}");
     }
 
     public static function notFoundForZipcode(int $zipcode): self
     {
+        /** @phpstan-ignore-next-line */
         return new static("Couldn't find Canton for given zipcode: {$zipcode}");
     }
 }