diff --git a/tests/test_icalendar.py b/tests/test_icalendar.py
index e3fd81a..8b8bc21 100644
--- a/tests/test_icalendar.py
+++ b/tests/test_icalendar.py
@@ -549,11 +549,11 @@ def test_omits_dst_offset():
     # Check dateutil, pytz, and zoneinfo (3.9+) tzinfo instances
     _timezones = []
     if "dateutil" in globals():
-        tz = dateutil.tz.gettz("US/Eastern")
+        tz = dateutil.tz.gettz("America/New_York")
         assert tz is not None
         _timezones.append(tz)
     if "zoneinfo" in globals():
-        tz = zoneinfo.ZoneInfo("US/Eastern")
+        tz = zoneinfo.ZoneInfo("America/New_York")
         assert tz is not None
         _timezones.append(tz)