python-pendulum
diff --git a/src/pendulum/datetime.py b/src/pendulum/datetime.py
@@ -1257,7 +1257,12 @@ def fromtimestamp(cls, t: float, tz: datetime.tzinfo | None = None) -> Self:
 
     @classmethod
     def utcfromtimestamp(cls, t: float) -> Self:
-        return cls.instance(datetime.datetime.utcfromtimestamp(t), tz=None)
+        return cls.instance(
+            datetime.datetime.fromtimestamp(t, tz=datetime.timezone.utc).replace(
+                tzinfo=None
+            ),
+            tz=None,
+        )
 
     @classmethod
     def fromordinal(cls, n: int) -> Self:

diff --git a/tests/datetime/test_behavior.py b/tests/datetime/test_behavior.py
@@ -7,6 +7,7 @@
 from datetime import date
 from datetime import datetime
 from datetime import time
+from datetime import timezone as datetime_timezone
 
 import pytest
 
@@ -102,11 +103,39 @@ def test_fromtimestamp():
 
 def test_utcfromtimestamp():
     p = pendulum.DateTime.utcfromtimestamp(0)
-    dt = datetime.utcfromtimestamp(0)
+    dt = datetime.fromtimestamp(0, tz=datetime_timezone.utc).replace(tzinfo=None)
 
     assert p == dt
 
 
+def test_utcfromtimestamp_known_value():
+    p = pendulum.DateTime.utcfromtimestamp(1577836800)
+
+    assert p.year == 2020
+    assert p.month == 1
+    assert p.day == 1
+    assert p.hour == 0
+    assert p.minute == 0
+    assert p.second == 0
+    assert p.microsecond == 0
+
+
+def test_utcfromtimestamp_preserves_microseconds():
+    p = pendulum.DateTime.utcfromtimestamp(1577836800.123456)
+
+    assert p.year == 2020
+    assert p.month == 1
+    assert p.day == 1
+    assert p.microsecond == 123456
+
+
+def test_utcfromtimestamp_returns_naive_pendulum_datetime():
+    p = pendulum.DateTime.utcfromtimestamp(1577836800)
+
+    assert isinstance(p, pendulum.DateTime)
+    assert p.tzinfo is None
+
+
 def test_fromordinal():
     assert datetime.fromordinal(730120) == pendulum.DateTime.fromordinal(730120)
 

diff --git a/tests/datetime/test_construct.py b/tests/datetime/test_construct.py
@@ -3,6 +3,7 @@
 import os
 
 from datetime import datetime
+from datetime import timezone as datetime_timezone
 
 import pytest
 
@@ -41,7 +42,7 @@ def test_creates_an_instance_default_to_utcnow():
 def test_setting_timezone():
     tz = "Australia/Brisbane"
     dtz = timezone(tz)
-    dt = datetime.utcnow()
+    dt = datetime.now(datetime_timezone.utc).replace(tzinfo=None)
     offset = dtz.convert(dt).utcoffset().total_seconds() / 3600
 
     p = pendulum.datetime(dt.year, dt.month, dt.day, tz=dtz)
@@ -52,7 +53,7 @@ def test_setting_timezone():
 def test_setting_timezone_with_string():
     tz = "Australia/Brisbane"
     dtz = timezone(tz)
-    dt = datetime.utcnow()
+    dt = datetime.now(datetime_timezone.utc).replace(tzinfo=None)
     offset = dtz.convert(dt).utcoffset().total_seconds() / 3600
 
     p = pendulum.datetime(dt.year, dt.month, dt.day, tz=tz)