diff --git a/oslo_log/formatters.py b/oslo_log/formatters.py
index bf8455f2..4b2058cb 100644
--- a/oslo_log/formatters.py
+++ b/oslo_log/formatters.py
@@ -11,7 +11,6 @@
 #    under the License.
 
 import datetime
-import debtcollector
 import functools
 import io
 import itertools
@@ -33,13 +32,6 @@ from oslo_utils import encodeutils
 def _dictify_context(context):
     if getattr(context, 'get_logging_values', None):
         return context.get_logging_values()
-    elif getattr(context, 'to_dict', None):
-        debtcollector.deprecate(
-            'The RequestContext.get_logging_values() '
-            'method should be defined for logging context specific '
-            'information.  The to_dict() method is deprecated '
-            'for oslo.log use.', version='3.8.0', removal_version='5.0.0')
-        return context.to_dict()
     # This dict only style logging format will become deprecated
     # when projects using a dictionary object for context are updated
     elif isinstance(context, dict):
diff --git a/oslo_log/tests/unit/test_formatters.py b/oslo_log/tests/unit/test_formatters.py
index 73243321..f9054b1e 100644
--- a/oslo_log/tests/unit/test_formatters.py
+++ b/oslo_log/tests/unit/test_formatters.py
@@ -16,7 +16,6 @@
 
 import logging
 import sys
-from unittest import mock
 
 from oslo_config import cfg
 from oslo_config import fixture as config_fixture
@@ -37,17 +36,6 @@ def _fake_context():
     return ctxt
 
 
-class AlternativeRequestContext(object):
-
-    def __init__(self, user=None, tenant=None):
-        self.user = user
-        self.tenant = tenant
-
-    def to_dict(self):
-        return {'user': self.user,
-                'tenant': self.tenant}
-
-
 class FormatterTest(test_base.BaseTestCase):
 
     def setUp(self):
@@ -66,29 +54,14 @@ class FormatterTest(test_base.BaseTestCase):
     def test_dictify_context_empty(self):
         self.assertEqual({}, formatters._dictify_context(None))
 
-    @mock.patch("debtcollector.deprecate")
-    def test_dictify_context_with_dict(self, mock_deprecate):
+    def test_dictify_context_with_dict(self):
         d = {"user": "user"}
         self.assertEqual(d, formatters._dictify_context(d))
-        mock_deprecate.assert_not_called()
 
-    @mock.patch("debtcollector.deprecate")
-    def test_dictify_context_with_context(self, mock_deprecate):
+    def test_dictify_context_with_context(self):
         ctxt = _fake_context()
         self.assertEqual(ctxt.get_logging_values(),
                          formatters._dictify_context(ctxt))
-        mock_deprecate.assert_not_called()
-
-    @mock.patch("debtcollector.deprecate")
-    def test_dictify_context_without_get_logging_values(self, mock_deprecate):
-        ctxt = AlternativeRequestContext(user="user", tenant="tenant")
-        d = {"user": "user", "tenant": "tenant"}
-        self.assertEqual(d, formatters._dictify_context(ctxt))
-        mock_deprecate.assert_called_with(
-            'The RequestContext.get_logging_values() '
-            'method should be defined for logging context specific '
-            'information.  The to_dict() method is deprecated '
-            'for oslo.log use.', removal_version='5.0.0', version='3.8.0')
 
 
 # Test for https://bugs.python.org/issue28603
diff --git a/requirements.txt b/requirements.txt
index baf7e429..a49d6460 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,6 +4,5 @@ oslo.context>=2.21.0 # Apache-2.0
 oslo.i18n>=3.20.0 # Apache-2.0
 oslo.utils>=3.36.0 # Apache-2.0
 oslo.serialization>=2.25.0 # Apache-2.0
-debtcollector>=1.19.0 # Apache-2.0
 pyinotify>=0.9.6;sys_platform!='win32' and sys_platform!='darwin' and sys_platform!='sunos5' # MIT
 python-dateutil>=2.7.0 # BSD