diff --git a/CHANGELOG.md b/CHANGELOG.md
index bcd5a73..1589a40 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ python-asserts adheres to [semantic versioning](https://semver.org/).
 
 ## [Unreleased]
 
+### Fixed
+
+Fixed Python 3.12 deprecation warnings.
+
 ## [0.13.0] – 2024-03-13
 
 ### Added
diff --git a/asserts/__init__.py b/asserts/__init__.py
index 85958d9..7edb038 100644
--- a/asserts/__init__.py
+++ b/asserts/__init__.py
@@ -24,7 +24,7 @@
 
 import re
 import sys
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from json import loads as json_loads
 from typing import Any, Callable, Set
 from warnings import WarningMessage, catch_warnings
@@ -845,7 +845,7 @@ def assert_datetime_about_now(actual, msg_fmt="{msg}"):
 def assert_datetime_about_now_utc(actual, msg_fmt="{msg}"):
     """Fail if a datetime object is not within 5 seconds of UTC.
 
-    >>> assert_datetime_about_now_utc(datetime.utcnow())
+    >>> assert_datetime_about_now_utc(datetime.now(datetime.UTC))
     >>> assert_datetime_about_now_utc(datetime(1900, 1, 1, 12, 0, 0))
     Traceback (most recent call last):
         ...
@@ -857,7 +857,7 @@ def assert_datetime_about_now_utc(actual, msg_fmt="{msg}"):
     * now - current datetime that was tested against
     """
 
-    now = datetime.utcnow()
+    now = datetime.now(timezone.utc).replace(tzinfo=None)
     if actual is None:
         msg = "None is not a valid date/time"
         fail(msg_fmt.format(msg=msg, actual=actual, now=now))
diff --git a/test_asserts.py b/test_asserts.py
index cb8792e..186054e 100644
--- a/test_asserts.py
+++ b/test_asserts.py
@@ -3,7 +3,7 @@
 import re
 import sys
 from collections import OrderedDict
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from json import JSONDecodeError
 from unittest import TestCase
 from warnings import catch_warnings, simplefilter, warn
@@ -934,7 +934,9 @@ def test_assert_datetime_about_now__custom_message(self):
     # assert_datetime_about_now_utc()
 
     def test_assert_datetime_about_now_utc__close(self):
-        assert_datetime_about_now_utc(datetime.utcnow())
+        assert_datetime_about_now_utc(
+            datetime.now(timezone.utc).replace(tzinfo=None)
+        )
 
     def test_assert_datetime_about_now_utc__none__default_message(self):
         expected_message = r"^None is not a valid date/time$"
@@ -942,7 +944,7 @@ def test_assert_datetime_about_now_utc__none__default_message(self):
             assert_datetime_about_now_utc(None)
 
     def test_assert_datetime_about_now_utc__none__custom_message(self):
-        dt = datetime.utcnow().date().isoformat()
+        dt = datetime.now(timezone.utc).date().isoformat()
         expected = "None is not a valid date/time;None;{}".format(dt)
         with _assert_raises_assertion(expected):
             assert_datetime_about_now_utc(
@@ -950,12 +952,16 @@ def test_assert_datetime_about_now_utc__none__custom_message(self):
             )
 
     def test_assert_datetime_about_now_utc__too_low(self):
-        then = datetime.utcnow() - timedelta(minutes=1)
+        then = datetime.now(timezone.utc).replace(tzinfo=None) - timedelta(
+            minutes=1
+        )
         with assert_raises(AssertionError):
             assert_datetime_about_now_utc(then)
 
     def test_assert_datetime_about_now_utc__too_high(self):
-        then = datetime.utcnow() + timedelta(minutes=1)
+        then = datetime.now(timezone.utc).replace(tzinfo=None) + timedelta(
+            minutes=1
+        )
         with assert_raises(AssertionError):
             assert_datetime_about_now_utc(then)
 
@@ -970,7 +976,7 @@ def test_assert_datetime_about_now_utc__default_message(self):
 
     def test_assert_datetime_about_now_utc__custom_message(self):
         then = datetime(1990, 4, 13, 12, 30, 15)
-        now = datetime.utcnow().date().isoformat()
+        now = datetime.now(timezone.utc).date().isoformat()
         expected = (
             "datetime.datetime(1990, 4, 13, 12, 30, 15) "
             "is not close to current UTC date/time;12:30;{}".format(now)