diff --git a/oslo_messaging/serializer.py b/oslo_messaging/serializer.py
index b1761fd83..8b7c0a7a3 100644
--- a/oslo_messaging/serializer.py
+++ b/oslo_messaging/serializer.py
@@ -19,6 +19,7 @@ __all__ = ['Serializer', 'NoOpSerializer', 'JsonPayloadSerializer',
 
 import abc
 
+from debtcollector import removals
 from oslo_context import context as common_context
 from oslo_serialization import jsonutils
 import six
@@ -63,6 +64,7 @@ class Serializer(object):
         """
 
 
+@removals.remove(version="2.9", removal_version="3.0")
 class RequestContextSerializer(Serializer):
 
     def __init__(self, base):
diff --git a/requirements.txt b/requirements.txt
index 819fc247a..8175ec409 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,6 +13,7 @@ oslo.serialization>=1.10.0 # Apache-2.0
 oslo.service>=0.12.0 # Apache-2.0
 oslo.i18n>=1.5.0 # Apache-2.0
 stevedore>=1.5.0 # Apache-2.0
+debtcollector>=0.3.0  # Apache-2.0
 
 # for jsonutils
 six>=1.9.0