diff --git a/custom_components/immich/hub.py b/custom_components/immich/hub.py
index 6c58360..b2bd0aa 100644
--- a/custom_components/immich/hub.py
+++ b/custom_components/immich/hub.py
@@ -116,9 +116,9 @@ async def list_favorite_images(self) -> list[dict]:
             async with aiohttp.ClientSession() as session:
                 url = urljoin(self.host, "/api/search/metadata")
                 headers = {"Accept": "application/json", _HEADER_API_KEY: self.api_key}
-                data = {"isFavorite": "true"}
+                payload = {"isFavorite": True}
 
-                async with session.post(url=url, headers=headers, data=data) as response:
+                async with session.post(url=url, headers=headers, json=payload) as response:
                     if response.status != 200:
                         raw_result = await response.text()
                         _LOGGER.error("Error from API: body=%s", raw_result)