diff --git a/ironic_lib/disk_utils.py b/ironic_lib/disk_utils.py
index 5a1f2507..1dd905db 100644
--- a/ironic_lib/disk_utils.py
+++ b/ironic_lib/disk_utils.py
@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import base64
 import gzip
 import io
 import logging
@@ -27,7 +28,6 @@ import time
 
 from oslo_concurrency import processutils
 from oslo_config import cfg
-from oslo_serialization import base64
 from oslo_utils import excutils
 from oslo_utils import imageutils
 from oslo_utils import units
@@ -564,7 +564,7 @@ def _get_configdrive(configdrive, node_uuid, tempdir=None):
                                                    dir=tempdir)
 
     try:
-        data = io.BytesIO(base64.decode_as_bytes(data))
+        data = io.BytesIO(base64.b64decode(data))
     except Exception as exc:
         if isinstance(data, bytes):
             LOG.debug('Config drive for node %(node)s is not base64 encoded '
diff --git a/ironic_lib/exception.py b/ironic_lib/exception.py
index 226010a8..c2ec0cf1 100644
--- a/ironic_lib/exception.py
+++ b/ironic_lib/exception.py
@@ -24,10 +24,10 @@ SHOULD include dedicated exception logging.
 
 import collections
 from http import client as http_client
+import json
 
 from oslo_config import cfg
 from oslo_log import log as logging
-from oslo_serialization import jsonutils
 from oslo_utils import excutils
 
 from ironic_lib.common.i18n import _
@@ -67,7 +67,7 @@ def _ensure_exception_kwargs_serializable(exc_class_name, kwargs):
         constructor.
     :returns: a dictionary of serializable keyword arguments.
     """
-    serializers = [(jsonutils.dumps, _('when converting to JSON')),
+    serializers = [(json.dumps, _('when converting to JSON')),
                    (str, _('when converting to string'))]
     exceptions = collections.defaultdict(list)
     serializable_kwargs = {}
diff --git a/ironic_lib/tests/test_exception.py b/ironic_lib/tests/test_exception.py
index b7829c4e..c5197564 100644
--- a/ironic_lib/tests/test_exception.py
+++ b/ironic_lib/tests/test_exception.py
@@ -53,8 +53,8 @@ class TestIronicException(base.IronicLibTestCase):
         e = TestException(spam=Unserializable(), ham='eggs')
         message = log_mock.call_args[0][0] % log_mock.call_args[0][1]
         self.assertIsNotNone(
-            re.search('spam: .*JSON.* ValueError: Circular reference detected;'
-                      '.*string.* NotImplementedError: nostr', message)
+            re.search('spam: .*JSON.* NotImplementedError: nostr', message),
+            message
         )
         self.assertEqual({'ham': '"eggs"', 'code': 500}, e.kwargs)
 
@@ -66,6 +66,6 @@ class TestIronicException(base.IronicLibTestCase):
                           ham='eggs')
         message = log_mock.call_args[0][0] % log_mock.call_args[0][1]
         self.assertIsNotNone(
-            re.search('spam: .*JSON.* ValueError: Circular reference detected;'
-                      '.*string.* NotImplementedError: nostr', message)
+            re.search('spam: .*JSON.* NotImplementedError: nostr', message),
+            message
         )
diff --git a/requirements.txt b/requirements.txt
index 87ba5b35..21a31532 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,6 @@ pbr!=2.1.0,>=2.0.0 # Apache-2.0
 oslo.concurrency>=3.26.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
-oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
 requests>=2.14.2 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0