diff --git a/docs/configuration.md b/docs/configuration.md
index 681b79f..4db638c 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -200,4 +200,4 @@ print_r($logger->getRecords());
 ```
 
 
-[Paper]: https://hpi.de/fileadmin/user_upload/fachgebiete/naumann/publications/PDFs/2012_fenz_efficient.pdf
\ No newline at end of file
+[Paper]: https://hpi.de/oldsite/fileadmin/user_upload/fachgebiete/naumann/publications/PDFs/2012_fenz_efficient.pdf