diff --git a/omf/fileio.py b/omf/fileio.py
index 7cf0f943..a418464d 100644
--- a/omf/fileio.py
+++ b/omf/fileio.py
@@ -25,7 +25,7 @@ def save(project, filename, mode="x"):
     * **mode** - Valid values are "w" or "x" - if file exists, "w" will
       overwrite and "x" will error. Default is "X"
     """
-    time_tuple = datetime.datetime.utcnow().timetuple()[:6]
+    time_tuple = datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None).timetuple()[:6]
     if mode not in ("w", "x"):
         raise ValueError("File mode must be 'w' or 'x'")
     if len(filename) < 4 or filename[-4:] != ".omf":
diff --git a/tests/test_pointset.py b/tests/test_pointset.py
index 292b0dd5..bb1a3959 100644
--- a/tests/test_pointset.py
+++ b/tests/test_pointset.py
@@ -13,7 +13,7 @@ def test_pointset():
     assert elem.location_length("vertices") == 10
     elem.metadata = {
         "color": "green",
-        "date_created": datetime.datetime.utcnow(),
+        "date_created": datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None),
         "version": "v1.3",
     }
     assert elem.validate()