diff --git a/src/newsreader/news/collection/base.py b/src/newsreader/news/collection/base.py
index 1377078..eb11619 100644
--- a/src/newsreader/news/collection/base.py
+++ b/src/newsreader/news/collection/base.py
@@ -24,9 +24,6 @@ class Stream:
     def parse(self, response):
         raise NotImplementedError
 
-    class Meta:
-        abstract = True
-
 
 class Client:
     """
@@ -47,9 +44,6 @@ class Client:
     def __exit__(self, *args, **kwargs):
         pass
 
-    class Meta:
-        abstract = True
-
 
 class Builder:
     """
@@ -85,9 +79,6 @@ class Builder:
             strip_comments=True,
         )
 
-    class Meta:
-        abstract = True
-
 
 class Collector:
     """
@@ -104,9 +95,6 @@ class Collector:
     def collect(self, rules=None):
         raise NotImplementedError
 
-    class Meta:
-        abstract = True
-
 
 class Scheduler:
     """
@@ -134,9 +122,6 @@ class PostBuilder(Builder):
         for post in self.instances:
             post.save()
 
-    class Meta:
-        abstract = True
-
 
 class PostStream(Stream):
     rule_type = None