diff --git a/oslo_utils/timeutils.py b/oslo_utils/timeutils.py
index 390be530..ba45fda0 100644
--- a/oslo_utils/timeutils.py
+++ b/oslo_utils/timeutils.py
@@ -22,9 +22,9 @@ import datetime
 import functools
 import logging
 import time
+import zoneinfo
 
 import iso8601
-import pytz
 
 from oslo_utils import reflection
 
@@ -225,8 +225,8 @@ def unmarshall_time(tyme):
     if tzname:
         # Need to handle either iso8601 or python UTC format
         tzname = 'UTC' if tzname == 'UTC+00:00' else tzname
-        tzinfo = pytz.timezone(tzname)
-        dt = tzinfo.localize(dt)
+        tzinfo = zoneinfo.ZoneInfo(tzname)
+        dt = dt.replace(tzinfo=tzinfo)
     return dt
 
 
diff --git a/releasenotes/notes/implement-zoneinfo-to-remove-pytz-fba6f70db09ecdb8.yaml b/releasenotes/notes/implement-zoneinfo-to-remove-pytz-fba6f70db09ecdb8.yaml
new file mode 100644
index 00000000..24c7d7f4
--- /dev/null
+++ b/releasenotes/notes/implement-zoneinfo-to-remove-pytz-fba6f70db09ecdb8.yaml
@@ -0,0 +1,6 @@
+---
+other:
+  - |
+    Implement zoneinfo to allow us to remove pytz's dependency. zoneinfo
+    was introduced by python 3.9, and the series 2023.2 (bobcat) set py39
+    as the minimal supported runtime, so we are able to remove pytz.
diff --git a/requirements.txt b/requirements.txt
index 37374acf..9085e000 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,9 +5,9 @@
 
 iso8601>=0.1.11 # MIT
 oslo.i18n>=3.15.3 # Apache-2.0
-pytz>=2013.6 # MIT
 netaddr>=0.7.18 # BSD
 netifaces>=0.10.4 # MIT
 debtcollector>=1.2.0 # Apache-2.0
 pyparsing>=2.1.0 # MIT
 packaging>=20.4 # BSD
+tzdata>=2022.4 # MIT