diff --git a/src/Exceptions/UnserializableResponse.php b/src/Exceptions/UnserializableResponse.php
index 92554ff2..2da20676 100644
--- a/src/Exceptions/UnserializableResponse.php
+++ b/src/Exceptions/UnserializableResponse.php
@@ -9,7 +9,7 @@
 
 final class UnserializableResponse extends Exception
 {
-    protected string $content;
+    private string $content;
 
     /**
      * Creates a new Exception instance.