diff --git a/aiogram/utils/exceptions.py b/aiogram/utils/exceptions.py
index cee2820a..a289be25 100644
--- a/aiogram/utils/exceptions.py
+++ b/aiogram/utils/exceptions.py
@@ -7,6 +7,7 @@
             - MessageNotModified
             - MessageToForwardNotFound
             - MessageToDeleteNotFound
+            - MessageToPinNotFound
             - MessageIdentifierNotSpecified
             - MessageTextIsEmpty
             - MessageCantBeEdited
@@ -182,6 +183,13 @@ class MessageToDeleteNotFound(MessageError):
     match = 'message to delete not found'
 
 
+class MessageToPinNotFound(MessageError):
+    """
+    Will be raised when you try to pin deleted or unknown message.
+    """
+    match = 'message to pin not found'
+
+
 class MessageToReplyNotFound(MessageError):
     """
     Will be raised when you try to reply to very old or deleted or unknown message.