diff --git a/aiocoap/numbers/codes.py b/aiocoap/numbers/codes.py
index 4981839a..38f1c894 100644
--- a/aiocoap/numbers/codes.py
+++ b/aiocoap/numbers/codes.py
@@ -54,12 +54,14 @@ class Code(ExtensibleIntEnum):
     UNSUPPORTED_CONTENT_FORMAT = 143
     UNSUPPORTED_MEDIA_TYPE = UNSUPPORTED_CONTENT_FORMAT # deprecated alias
     UNPROCESSABLE_ENTITY = (4 << 5) + 22
+    TOO_MANY_REQUESTS = (4 << 5) + 29
     INTERNAL_SERVER_ERROR = 160
     NOT_IMPLEMENTED = 161
     BAD_GATEWAY = 162
     SERVICE_UNAVAILABLE = 163
     GATEWAY_TIMEOUT = 164
     PROXYING_NOT_SUPPORTED = 165
+    HOP_LIMIT_REACHED = (5 << 5) + 8
 
     CSM = 225
     PING = 226