diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 9d945567450344fa94ec9e6280095e86a6c532b0..08aef91b213be4ddd939a50b8dc41a603a8cc14f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -9,7 +9,7 @@ default_language_version:
 
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: ebc15addedad713c86ef18ae9632c88e187dd0af  # v3.1.0
+    rev: 9136088a246768144165fcc3ecc3d31bb686920a # v3.3.0
     hooks:
       - id: trailing-whitespace
       # Replaces or checks mixed line ending
@@ -27,9 +27,13 @@ repos:
       - id: debug-statements
       - id: check-yaml
         files: .*\.(yaml|yml)$
-  - repo: https://gitlab.com/pycqa/flake8
-    rev: 181bb46098dddf7e2d45319ea654b4b4d58c2840 # 3.8.3
+  - repo: local
     hooks:
       - id: flake8
+        name: flake8
         additional_dependencies:
           - hacking>=3.0.1,<3.1.0
+        language: python
+        entry: flake8
+        files: '^.*\.py$'
+        exclude: '^(doc|releasenotes|tools)/.*$'
diff --git a/.zuul.yaml b/.zuul.yaml
index 842503010e8067207e14a591251da141657d69b2..84bb45c2f858c4e54d39cadce50ede7e7390c34e 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -2,7 +2,7 @@
     templates:
       - check-requirements
       - lib-forward-testing-python3
-      - openstack-python3-wallaby-jobs
+      - openstack-python3-xena-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
diff --git a/lower-constraints.txt b/lower-constraints.txt
deleted file mode 100644
index 107c82e0b4105da0c83a1803303c2e5a5fcd68fc..0000000000000000000000000000000000000000
--- a/lower-constraints.txt
+++ /dev/null
@@ -1,35 +0,0 @@
-appdirs==1.3.0
-Babel==2.3.4
-bandit==1.4.0
-coverage==4.0
-debtcollector==1.2.0
-extras==1.0.0
-fixtures==3.0.0
-gitdb==0.6.4
-GitPython==1.0.1
-ipaddress===1.0.17
-iso8601==0.1.11
-keystoneauth1==3.4.0
-linecache2==1.0.0
-mox3==0.20.0
-msgpack==0.5.2
-netaddr==0.7.18
-netifaces==0.10.4
-os-client-config==1.28.0
-oslo.i18n==3.15.3
-oslo.utils==3.33.0
-oslotest==3.2.0
-pbr==2.0.0
-pyparsing==2.1.0
-python-mimeparse==1.6.0
-python-subunit==1.0.0
-pytz==2013.6
-requests==2.14.2
-requestsexceptions==1.2.0
-smmap==0.9.0
-stestr==2.0.0
-stevedore==1.20.0
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-wrapt==1.7.0
diff --git a/oslo_serialization/tests/test_jsonutils.py b/oslo_serialization/tests/test_jsonutils.py
index f07682203d76b8bc7805575197da0976e0d0fb7a..9c922359bc8f8baeba5c683744a2b1dae18cc418 100644
--- a/oslo_serialization/tests/test_jsonutils.py
+++ b/oslo_serialization/tests/test_jsonutils.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import collections
+import collections.abc
 import datetime
 import functools
 import io
@@ -241,9 +242,9 @@ class ToPrimitiveTestCase(test_base.BaseTestCase):
         self.assertEqual({'iteritems': 'iteritems'}, p)
 
     def test_mapping(self):
-        # Make sure collections.Mapping is converted to a dict
+        # Make sure collections.abc.Mapping is converted to a dict
         # and not a list.
-        class MappingClass(collections.Mapping):
+        class MappingClass(collections.abc.Mapping):
             def __init__(self):
                 self.data = dict(a=1, b=2, c=3)
 
diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
index 8e1b9fe0e4521a14f41cbff38f7063a6460bfba5..19a54bea7997b5519003ba941cb7b1127802f717 100644
--- a/releasenotes/source/index.rst
+++ b/releasenotes/source/index.rst
@@ -6,6 +6,7 @@
    :maxdepth: 1
 
    unreleased
+   wallaby
    victoria
    ussuri
    train
diff --git a/releasenotes/source/wallaby.rst b/releasenotes/source/wallaby.rst
new file mode 100644
index 0000000000000000000000000000000000000000..d77b56599553b6fe996624b33c1663168342fb94
--- /dev/null
+++ b/releasenotes/source/wallaby.rst
@@ -0,0 +1,6 @@
+============================
+Wallaby Series Release Notes
+============================
+
+.. release-notes::
+   :branch: stable/wallaby
diff --git a/setup.cfg b/setup.cfg
index 3d464b5b278a3c83217a8e18d77da2b07af7ef8e..6b0ff4d61afe3d3d6fa3830dc586b95ce50881ca 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,12 +1,12 @@
 [metadata]
 name = oslo.serialization
 summary = Oslo Serialization library
-description-file =
+description_file =
     README.rst
 author = OpenStack
-author-email = openstack-discuss@lists.openstack.org
-home-page = https://docs.openstack.org/oslo.serialization/latest/
-python-requires = >=3.6
+author_email = openstack-discuss@lists.openstack.org
+home_page = https://docs.openstack.org/oslo.serialization/latest/
+python_requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
diff --git a/tox.ini b/tox.ini
index 929b8dc4ca6dd038bd34f47623a8b03f9c37bf21..3069e46bff45dda23df0feddd57cfa2adf568538 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@ ignore_basepython_conflict = true
 
 [testenv]
 deps =
-  -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/requirements.txt
 commands = stestr run --slowest {posargs}
@@ -26,7 +26,7 @@ commands = python setup.py test --coverage --coverage-package-name=oslo_serializ
 [testenv:docs]
 whitelist_externals = rm
 deps =
-  -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/doc/requirements.txt
 commands =
   rm -fr doc/build
@@ -39,12 +39,6 @@ commands =
   rm -rf releasenotes/build
   sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html
 
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt
-
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
 # W504 line break after binary operator