diff --git a/pandas/tests/io/pytables/test_timezones.py b/pandas/tests/io/pytables/test_timezones.py
index b455235669636..9192804e49bd1 100644
--- a/pandas/tests/io/pytables/test_timezones.py
+++ b/pandas/tests/io/pytables/test_timezones.py
@@ -104,7 +104,7 @@ def test_append_with_timezones(setup_path, gettz):
 
         msg = (
             r"invalid info for \[values_block_1\] for \[tz\], "
-            r"existing_value \[(dateutil/.*)?US/Eastern\] "
+            r"existing_value \[(dateutil/.*)?(US/Eastern|America/New_York)\] "
             r"conflicts with new value \[(dateutil/.*)?EET\]"
         )
         with pytest.raises(ValueError, match=msg):
diff --git a/pandas/tests/scalar/timestamp/test_formats.py b/pandas/tests/scalar/timestamp/test_formats.py
index 6a578b0a9eb09..b4493088acb31 100644
--- a/pandas/tests/scalar/timestamp/test_formats.py
+++ b/pandas/tests/scalar/timestamp/test_formats.py
@@ -89,7 +89,7 @@ def test_isoformat(ts, timespec, expected_iso):
 
 class TestTimestampRendering:
     @pytest.mark.parametrize(
-        "tz", ["UTC", "Asia/Tokyo", "US/Eastern", "dateutil/US/Pacific"]
+        "tz", ["UTC", "Asia/Tokyo", "US/Eastern", "dateutil/America/Los_Angeles"]
     )
     @pytest.mark.parametrize("freq", ["D", "M", "S", "N"])
     @pytest.mark.parametrize(