diff --git a/poetry.lock b/poetry.lock
index 8bd3cf36..749e1d95 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.6.1 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.5.1 and should not be changed by hand.
 
 [[package]]
 name = "aiohttp"
@@ -1416,17 +1416,6 @@ pytest = ">=4.6"
 [package.extras]
 testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtualenv"]
 
-[[package]]
-name = "pytz"
-version = "2023.3.post1"
-description = "World timezone definitions, modern and historical"
-optional = false
-python-versions = "*"
-files = [
-    {file = "pytz-2023.3.post1-py2.py3-none-any.whl", hash = "sha256:ce42d816b81b68506614c11e8937d3aa9e41007ceb50bfdcb0749b921bf646c7"},
-    {file = "pytz-2023.3.post1.tar.gz", hash = "sha256:7b4fddbeb94a1eba4b557da24f19fdf9db575192544270a9101d8509f9f43d7b"},
-]
-
 [[package]]
 name = "pyupgrade"
 version = "3.11.0"
@@ -1931,17 +1920,6 @@ files = [
     {file = "tomlkit-0.12.1.tar.gz", hash = "sha256:38e1ff8edb991273ec9f6181244a6a391ac30e9f5098e7535640ea6be97a7c86"},
 ]
 
-[[package]]
-name = "types-pytz"
-version = "2023.3.0.1"
-description = "Typing stubs for pytz"
-optional = false
-python-versions = "*"
-files = [
-    {file = "types-pytz-2023.3.0.1.tar.gz", hash = "sha256:1a7b8d4aac70981cfa24478a41eadfcd96a087c986d6f150d77e3ceb3c2bdfab"},
-    {file = "types_pytz-2023.3.0.1-py3-none-any.whl", hash = "sha256:65152e872137926bb67a8fe6cc9cfd794365df86650c5d5fdc7b167b0f38892e"},
-]
-
 [[package]]
 name = "typing-extensions"
 version = "4.7.1"
@@ -2301,4 +2279,4 @@ testing = ["big-O", "jaraco.functools", "jaraco.itertools", "more-itertools", "p
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9.0"
-content-hash = "d35e0e77b183d7b0556f7d5ddabdee0b3c4eb018c972bbde482a5823e28e0092"
+content-hash = "df73244dd3ef6061831a1d69f5ae7adbcb67225711da653f3a66fcc8800bc33c"
diff --git a/pyproject.toml b/pyproject.toml
index d23e1c58..40dfe0a3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,7 +68,6 @@ backoff = ">=1.11.1"
 beautifulsoup4 = ">=4.11.1"
 certifi = ">=2023.07.22"
 python = "^3.9.0"
-pytz = ">=2019.3"
 voluptuous = ">=0.11.7"
 websockets = ">=8.1"
 
@@ -96,7 +95,6 @@ requests = ">=2.31.0"
 ruff = ">=0.0.261,<0.0.291"
 safety = "^2.3.1"
 sphinx-rtd-theme = "^1.0.0"
-types-pytz = ">=2022.1,<2024.0"
 vulture = "^2.6"
 yamllint = "^1.28.0"
 
diff --git a/simplipy/util/dt.py b/simplipy/util/dt.py
index 3952efa6..b1aca5bc 100644
--- a/simplipy/util/dt.py
+++ b/simplipy/util/dt.py
@@ -1,9 +1,5 @@
 """Define datetime utilities."""
-from datetime import datetime
-
-import pytz
-
-UTC = pytz.utc
+from datetime import datetime, timezone
 
 
 def utc_from_timestamp(timestamp: float) -> datetime:
@@ -15,4 +11,4 @@ def utc_from_timestamp(timestamp: float) -> datetime:
     Returns:
         A parsed ``datetime.datetime`` object.
     """
-    return UTC.localize(datetime.utcfromtimestamp(timestamp))
+    return datetime.fromtimestamp(timestamp, tz=timezone.utc)
diff --git a/tests/system/test_v3.py b/tests/system/test_v3.py
index 1a82bfd4..f0bb5ad3 100644
--- a/tests/system/test_v3.py
+++ b/tests/system/test_v3.py
@@ -1,13 +1,12 @@
 """Define tests for v3 System objects."""
 # pylint: disable=too-many-lines
 import logging
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from typing import Any, cast
 from unittest.mock import Mock
 
 import aiohttp
 import pytest
-import pytz
 from aresponses import ResponsesMockServer
 
 from simplipy import API
@@ -54,7 +53,9 @@ async def test_as_dict(
                     "category": "error",
                     "code": "2000",
                     "timestamp": 1581823228,
-                    "received_dt": datetime(2020, 2, 16, 3, 20, 28, tzinfo=pytz.UTC),
+                    "received_dt": datetime(
+                        2020, 2, 16, 3, 20, 28, tzinfo=timezone.utc
+                    ),
                     "link": "http://link.to.info",
                     "link_label": "More Info",
                 }
@@ -1680,7 +1681,7 @@ async def test_system_notifications(
         assert notification1.category == "error"
         assert notification1.code == "2000"
         assert notification1.received_dt == datetime(
-            2020, 2, 16, 3, 20, 28, tzinfo=pytz.UTC
+            2020, 2, 16, 3, 20, 28, tzinfo=timezone.utc
         )
         assert notification1.link == "http://link.to.info"
         assert notification1.link_label == "More Info"
diff --git a/tests/test_websocket.py b/tests/test_websocket.py
index 6ab40778..5e27259c 100644
--- a/tests/test_websocket.py
+++ b/tests/test_websocket.py
@@ -4,13 +4,12 @@
 import asyncio
 import logging
 from collections import deque
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from time import time
 from typing import Any
 from unittest.mock import AsyncMock, Mock
 
 import pytest
-import pytz
 from aiohttp.client_exceptions import (
     ClientError,
     ServerDisconnectedError,
@@ -142,7 +141,7 @@ def test_create_event(ws_message_event: dict[str, Any]) -> None:
     assert event.event_type == EVENT_DISARMED_BY_MASTER_PIN
     assert event.info == "System Disarmed by Master PIN"
     assert event.system_id == 12345
-    assert event.timestamp == datetime(2021, 9, 29, 23, 14, 46, tzinfo=pytz.UTC)
+    assert event.timestamp == datetime(2021, 9, 29, 23, 14, 46, tzinfo=timezone.utc)
     assert event.changed_by == "Master PIN"
     assert event.sensor_name == ""
     assert event.sensor_serial == "abcdef12"