diff --git a/monkey/common/credentials/encoding.py b/monkey/common/credentials/encoding.py
index e76ff8599..b5b58ec53 100644
--- a/monkey/common/credentials/encoding.py
+++ b/monkey/common/credentials/encoding.py
@@ -5,7 +5,7 @@ from typing import Optional, Union
 from pydantic import SecretBytes, SecretStr
 
 
-def get_plaintext(secret: Union[SecretStr, SecretBytes, None, str]) -> Optional[str]:
+def get_plaintext(secret: Union[SecretStr, SecretBytes, None, str]) -> Optional[Union[str, bytes]]:
     if isinstance(secret, (SecretStr, SecretBytes)):
         return secret.get_secret_value()
     else: