diff --git a/app/assets/api/routes.py b/app/assets/api/routes.py
index 02b4d1726..68126b6a5 100644
--- a/app/assets/api/routes.py
+++ b/app/assets/api/routes.py
@@ -494,7 +494,6 @@ async def update_asset_route(request: web.Request) -> web.Response:
             name=body.name,
             user_metadata=body.user_metadata,
             owner_id=USER_MANAGER.get_request_user_id(request),
-            mime_type=body.mime_type,
             preview_id=body.preview_id,
         )
         payload = _build_asset_response(result)
diff --git a/app/assets/api/schemas_in.py b/app/assets/api/schemas_in.py
index 8bcbc6dca..186a6ae1e 100644
--- a/app/assets/api/schemas_in.py
+++ b/app/assets/api/schemas_in.py
@@ -100,17 +100,16 @@ class ListAssetsQuery(BaseModel):
 class UpdateAssetBody(BaseModel):
     name: str | None = None
     user_metadata: dict[str, Any] | None = None
-    mime_type: str | None = None
     preview_id: str | None = None  # references an asset_reference id, not an asset id
 
     @model_validator(mode="after")
     def _validate_at_least_one_field(self):
         if all(
             v is None
-            for v in (self.name, self.user_metadata, self.mime_type, self.preview_id)
+            for v in (self.name, self.user_metadata, self.preview_id)
         ):
             raise ValueError(
-                "Provide at least one of: name, user_metadata, mime_type, preview_id."
+                "Provide at least one of: name, user_metadata, preview_id."
             )
         return self