diff --git a/pyproject.toml b/pyproject.toml
index 13a6705..62f2041 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ dev = [
     "pytest~=7.3",
     "pytest-asyncio~=0.21",
     "pytest-cov~=4.1",
-    "ruff==0.1.1",
+    "ruff==0.1.4",
     "types-aiofiles~=23.1",
     "types-python-dateutil~=2.8.19",
     "types-tqdm~=4.66.0",
diff --git a/src/stac_asset/_functions.py b/src/stac_asset/_functions.py
index 314fb27..487acae 100644
--- a/src/stac_asset/_functions.py
+++ b/src/stac_asset/_functions.py
@@ -377,6 +377,7 @@ async def download_asset(
 
     if messages:
         if asset.owner:
+            assert isinstance(asset.owner, (Item, Collection))
             owner_id = asset.owner.id
         else:
             owner_id = None