diff --git a/tiddl/core/api/models/resources.py b/tiddl/core/api/models/resources.py
index 93dd9b8..f316e67 100644
--- a/tiddl/core/api/models/resources.py
+++ b/tiddl/core/api/models/resources.py
@@ -125,7 +125,7 @@ class Album(BaseModel):
     numberOfTracks: int
     numberOfVideos: int
     numberOfVolumes: int
-    releaseDate: datetime
+    releaseDate: datetime | str | None
     copyright: Optional[str] = None
     type: Literal["ALBUM", "SINGLE", "EP"]
     version: Optional[str] = None