diff --git a/mautrix_telegram/matrix.py b/mautrix_telegram/matrix.py
index e91726dd..f0bb9890 100644
--- a/mautrix_telegram/matrix.py
+++ b/mautrix_telegram/matrix.py
@@ -222,7 +222,7 @@ class MatrixHandler:
         sender = await u.User.get_by_mxid(sender_id).ensure_started()
         if not sender.relaybot_whitelisted:
             self.log.debug(f"Ignoring message \"{message}\" from {sender} to {room}:"
-                           " u.User is not whitelisted.")
+                           " User is not whitelisted.")
             return
         self.log.debug(f"Received Matrix event \"{message}\" from {sender} in {room}")
 
diff --git a/setup.py b/setup.py
index 91792b28..b6a1f000 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@ setuptools.setup(
         "ruamel.yaml>=0.15.35,<0.16",
         "future-fstrings>=0.4.2",
         "python-magic>=0.4.15,<0.5",
-        "telethon>=1.5,<1.6",
+        "telethon>=1.5,<1.5.4",
         "telethon-session-sqlalchemy>=0.2.3,<0.3",
     ],
     extras_require=extras,