diff --git a/src/cartsnitch_api/cache.py b/src/cartsnitch_api/cache.py
index 6766a8c..836bfb8 100644
--- a/src/cartsnitch_api/cache.py
+++ b/src/cartsnitch_api/cache.py
@@ -35,7 +35,7 @@ class CacheClient:
     async def get(self, key: str) -> str | None:
         if not self._client:
             return None
-        value = await self._client.get(key)
+        value: str | bytes | None = await self._client.get(key)
         if value is None:
             return None
         if isinstance(value, bytes):