diff --git a/src/BusProNet/XmlParser/AgeConstraintParserRegistry.php b/src/BusProNet/XmlParser/AgeConstraintParserRegistry.php
index bdd19ad..08f2ea6 100644
--- a/src/BusProNet/XmlParser/AgeConstraintParserRegistry.php
+++ b/src/BusProNet/XmlParser/AgeConstraintParserRegistry.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace App\BusProNet\XmlParser;
 
 use App\BusProNet\Model\AgeConstraintResult;
+use App\BusProNet\XmlParser\Contract\AgeConstraintParserInterface;
 
 /**
  * Registry for managing and executing age constraint parsers.
diff --git a/src/BusProNet/XmlParser/BirthYearConstraintParser.php b/src/BusProNet/XmlParser/BirthYearConstraintParser.php
index 35e76cf..776a7fa 100644
--- a/src/BusProNet/XmlParser/BirthYearConstraintParser.php
+++ b/src/BusProNet/XmlParser/BirthYearConstraintParser.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace App\BusProNet\XmlParser;
 
 use App\BusProNet\Model\AgeConstraintResult;
+use App\BusProNet\XmlParser\Contract\AgeConstraintParserInterface;
 
 /**
  * Parser for birth year constraint data in JG:YYYY-YYYY format.
diff --git a/src/BusProNet/XmlParser/AgeConstraintParserInterface.php b/src/BusProNet/XmlParser/Contract/AgeConstraintParserInterface.php
similarity index 96%
rename from src/BusProNet/XmlParser/AgeConstraintParserInterface.php
rename to src/BusProNet/XmlParser/Contract/AgeConstraintParserInterface.php
index 847285e..4e5b064 100644
--- a/src/BusProNet/XmlParser/AgeConstraintParserInterface.php
+++ b/src/BusProNet/XmlParser/Contract/AgeConstraintParserInterface.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace App\BusProNet\XmlParser;
+namespace App\BusProNet\XmlParser\Contract;
 
 use App\BusProNet\Model\AgeConstraintResult;