diff --git a/tests/test_io.py b/tests/test_io.py
index 00a04e5..f535321 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -15,7 +15,7 @@ def example_data(self):
         return stmtools.from_csv(path_example_csv)
 
     def test_readcsv_dims(self, example_data):
-        assert example_data.dims == {"space": 2500, "time": 11}
+        assert example_data.sizes == {"space": 2500, "time": 11}
 
     def test_readcsv_vars(self, example_data):
         expected_columns = [