diff --git a/dkist/io/asdf/tests/test_dataset.py b/dkist/io/asdf/tests/test_dataset.py
index f475e6b6..4d0d843e 100644
--- a/dkist/io/asdf/tests/test_dataset.py
+++ b/dkist/io/asdf/tests/test_dataset.py
@@ -103,6 +103,7 @@ def test_save_dataset_with_file_schema(tagobj, tmpdir):
     tree = {"dataset": tagobj}
     with importlib_resources.as_file(importlib_resources.files("dkist.io") / "level_1_dataset_schema.yaml") as schema_path:
         with asdf.AsdfFile(tree, custom_schema=schema_path.as_posix()) as afile:
+            afile.validate()  # it seems that asdf 4.0 does not validate the custom schema on write?
             afile.write_to(Path(tmpdir / "test.asdf"))
 
 
diff --git a/dkist/io/level_1_dataset_schema.yaml b/dkist/io/level_1_dataset_schema.yaml
index bbcc67d6..63a0a584 100644
--- a/dkist/io/level_1_dataset_schema.yaml
+++ b/dkist/io/level_1_dataset_schema.yaml
@@ -19,6 +19,7 @@ properties:
       - $ref: "asdf://dkist.nso.edu/schemas/dataset-1.1.0"
       - $ref: "asdf://dkist.nso.edu/schemas/tiled_dataset-0.1.0"
       - $ref: "asdf://dkist.nso.edu/schemas/tiled_dataset-1.0.0"
+      - $ref: "asdf://dkist.nso.edu/schemas/tiled_dataset-1.1.0"
 
 required: [dataset]
 additionalProperties: true