diff --git a/spectacles/__init__.py b/spectacles/__init__.py
index d77091b9..7bcbf566 100644
--- a/spectacles/__init__.py
+++ b/spectacles/__init__.py
@@ -1 +1 @@
-__version__ = "2.3.17"
+__version__ = "2.3.18"
diff --git a/spectacles/client.py b/spectacles/client.py
index 4c3e654a..13fea066 100644
--- a/spectacles/client.py
+++ b/spectacles/client.py
@@ -909,7 +909,7 @@ async def cached_lookml_validation(self, project) -> Optional[JsonDict]:
         result = response.json()
         return result
 
-    @cached(cache=Cache.MEMORY, serializer=serializers.PickleSerializer)
+    @cached(cache=Cache.MEMORY, serializer=serializers.PickleSerializer())
     @backoff.on_exception(backoff.expo, BACKOFF_EXCEPTIONS, max_tries=DEFAULT_MAX_TRIES)
     async def all_folders(self) -> List[JsonDict]:
         logger.debug("Getting information about all folders")