diff --git a/src/Runtime/RuntimeException.php b/src/Runtime/RuntimeException.php
index 4dcd194..2291477 100644
--- a/src/Runtime/RuntimeException.php
+++ b/src/Runtime/RuntimeException.php
@@ -6,7 +6,7 @@
 
 use KaririCode\Exception\AbstractException;
 
-final class RuntimeException extends AbstractException
+class RuntimeException extends AbstractException
 {
     private const CODE_UNEXPECTED_VALUE = 2501;
     private const CODE_OUT_OF_MEMORY = 2502;