diff --git a/pandas/tests/reshape/test_cut.py b/pandas/tests/reshape/test_cut.py
index 3c612bdd1297c..0811c69859c0d 100644
--- a/pandas/tests/reshape/test_cut.py
+++ b/pandas/tests/reshape/test_cut.py
@@ -469,15 +469,22 @@ def test_datetime_cut(unit, box):
         # See https://github.com/pandas-dev/pandas/pull/56101#discussion_r1405325425
         # for why we round to 8 seconds instead of 7
         left = DatetimeIndex(
-            ["2012-12-31 23:57:08", "2013-01-01 16:00:00", "2013-01-02 08:00:00"]
-        ).as_unit(unit)
+            ["2012-12-31 23:57:08", "2013-01-01 16:00:00", "2013-01-02 08:00:00"],
+            dtype=f"M8[{unit}]",
+        )
     else:
         left = DatetimeIndex(
-            ["2012-12-31 23:57:07.200000", "2013-01-01 16:00:00", "2013-01-02 08:00:00"]
-        ).as_unit(unit)
+            [
+                "2012-12-31 23:57:07.200000",
+                "2013-01-01 16:00:00",
+                "2013-01-02 08:00:00",
+            ],
+            dtype=f"M8[{unit}]",
+        )
     right = DatetimeIndex(
-        ["2013-01-01 16:00:00", "2013-01-02 08:00:00", "2013-01-03 00:00:00"]
-    ).as_unit(unit)
+        ["2013-01-01 16:00:00", "2013-01-02 08:00:00", "2013-01-03 00:00:00"],
+        dtype=f"M8[{unit}]",
+    )
 
     exp_intervals = IntervalIndex.from_arrays(left, right)
     expected = Series(exp_intervals).astype(CategoricalDtype(ordered=True))