diff --git a/tests/test_data.py b/tests/test_data.py
index 1d9c5c9..4a063da 100644
--- a/tests/test_data.py
+++ b/tests/test_data.py
@@ -67,6 +67,6 @@ class Weather:
     10 * np.random.rand(2, 2, 3),
     np.array([[-99.83, -99.32], [-99.79, -99.23]]),
     np.array([[42.25, 42.21], [42.63, 42.59]]),
-    np.array(["2014-09-06", "2014-09-07", "2014-09-08"], "M8[ns]"),
+    np.array(["2014-09-06", "2014-09-07", "2014-09-08"], "M8[ns]"),  # type: ignore
     np.datetime64("2014-09-05"),
 )