diff --git a/api/advent22_api/core/webdav.py b/api/advent22_api/core/webdav.py
index 117b7b4..672a6ce 100644
--- a/api/advent22_api/core/webdav.py
+++ b/api/advent22_api/core/webdav.py
@@ -2,6 +2,7 @@ import re
 from io import BytesIO
 
 from cache import AsyncTTL
+from cache.key import KEY
 from webdav3.client import Client as WebDAVclient
 
 from .settings import SETTINGS
@@ -42,7 +43,7 @@ class WebDAV:
         return cls._webdav_client.check(path)
 
     @classmethod
-    @AsyncTTL(time_to_live=SETTINGS.webdav.cache_ttl, skip_args=1)
+    @(_rb_ttl := AsyncTTL(time_to_live=SETTINGS.webdav.cache_ttl, skip_args=1))
     async def read_bytes(cls, path: str) -> bytes:
         """
         Datei aus Pfad `path` als bytes laden
@@ -70,6 +71,9 @@ class WebDAV:
 
         cls._webdav_client.resource(path).read_from(buffer)
 
+        # Cache-Eintrag entfernen (hack: siehe AsyncTTL._TTL.__contains__)
+        del cls._rb_ttl.ttl[KEY((path,), {})]
+
     @classmethod
     async def write_str(cls, path: str, content: str, encoding="utf-8") -> None:
         """