diff --git a/src/codeocean/data_asset.py b/src/codeocean/data_asset.py
index 19add5e..52482dc 100644
--- a/src/codeocean/data_asset.py
+++ b/src/codeocean/data_asset.py
@@ -25,9 +25,9 @@ class DataAssetState(StrEnum):
 class Provenance:
     commit: str
     run_script: str
-    data_assets: str
     docker_image: str
     capsule: str
+    data_assets: Optional[list[str]] = None
 
 
 class DataAssetOrigin(StrEnum):