diff --git a/src/BotDetector/Bots.php b/src/BotDetector/Bots.php
index e778457..32e7454 100644
--- a/src/BotDetector/Bots.php
+++ b/src/BotDetector/Bots.php
@@ -418,6 +418,7 @@ final class Bots
     |faveeo.com
     |kozmonavt\.
     |CriteoBot/
+    |PayPal\sIPN
     |[a-z0-9\-_]*((?<!cu|power[\s_]|m[\s_])bot(?![\s_]TAB|[\s_]?5[0-9]|[\s_]Senior|[\s_]Junior)|crawler|crawl|checker|archiver|transcoder|spider)([^a-z]|$)
     #x";
 }