diff --git a/oslo_serialization/msgpackutils.py b/oslo_serialization/msgpackutils.py
index e71a123..eb9cb31 100644
--- a/oslo_serialization/msgpackutils.py
+++ b/oslo_serialization/msgpackutils.py
@@ -33,16 +33,10 @@ import functools
 import itertools
 import uuid
 from xmlrpc import client as xmlrpclib
+import zoneinfo
 
 import msgpack
 
-try:
-    import zoneinfo
-except ImportError:
-    # zoneinfo is available in Python >= 3.9
-    from pytz import timezone
-    zoneinfo = None
-
 from oslo_utils import importutils
 
 netaddr = importutils.try_import("netaddr")
@@ -243,11 +237,7 @@ class DateTimeHandler(object):
             'microsecond': dt.microsecond,
         }
         if dt.tzinfo:
-            if zoneinfo:
-                tz = str(dt.tzinfo)
-            else:
-                tz = dt.tzinfo.tzname(None)
-            dct['tz'] = tz
+            dct['tz'] = str(dt.tzinfo)
         return dumps(dct, registry=self._registry)
 
     def deserialize(self, blob):
@@ -274,12 +264,7 @@ class DateTimeHandler(object):
                                second=dct['second'],
                                microsecond=dct['microsecond'])
         if 'tz' in dct and dct['tz']:
-            if zoneinfo:
-                tzinfo = zoneinfo.ZoneInfo(dct['tz'])
-                dt = dt.replace(tzinfo=tzinfo)
-            else:
-                tzinfo = timezone(dct['tz'])
-                dt = tzinfo.localize(dt)
+            dt = dt.replace(tzinfo=zoneinfo.ZoneInfo(dct['tz']))
         return dt
 
 
diff --git a/releasenotes/notes/remove-py38-2c724027a885cf0b.yaml b/releasenotes/notes/remove-py38-2c724027a885cf0b.yaml
new file mode 100644
index 0000000..0403163
--- /dev/null
+++ b/releasenotes/notes/remove-py38-2c724027a885cf0b.yaml
@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Support for Python 3.8 has been removed. Now the minimum python version
+    supported is 3.9 .
diff --git a/requirements.txt b/requirements.txt
index e5a5cef..a59a4e8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,5 +6,4 @@
 pbr>=2.0.0 # Apache-2.0
 msgpack>=0.5.2 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
-pytz>=2013.6;python_version<"3.9" # MIT
-tzdata>=2022.4;python_version>="3.9" # MIT
+tzdata>=2022.4 # MIT
diff --git a/setup.cfg b/setup.cfg
index 0b69db6..6c02e81 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -6,7 +6,7 @@ description_file =
 author = OpenStack
 author_email = openstack-discuss@lists.openstack.org
 home_page = https://docs.openstack.org/oslo.serialization/latest/
-python_requires = >=3.8
+python_requires = >=3.9
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -15,7 +15,6 @@ classifier =
     Operating System :: POSIX :: Linux
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11