diff --git a/src/feed.py b/src/feed.py
index 16b6a64..fb249cf 100644
--- a/src/feed.py
+++ b/src/feed.py
@@ -250,7 +250,7 @@ class DjangoDataModel(ABC):
         return cls(**cls.parser(data))
 
 
-@dataclass
+@dataclass(slots=True)
 class Subscription(DjangoDataModel):
 
     uuid: str
@@ -269,7 +269,7 @@ class Subscription(DjangoDataModel):
         return item
 
 
-@dataclass
+@dataclass(slots=True)
 class SubscriptionChannel(DjangoDataModel):
 
     uuid: str
@@ -304,7 +304,7 @@ class SubscriptionChannel(DjangoDataModel):
         return value
 
 
-@dataclass
+@dataclass(slots=True)
 class TrackedContent(DjangoDataModel):
 
     uuid: str