diff --git a/activitypub.py b/activitypub.py
index 95ce35a..3ce0441 100644
--- a/activitypub.py
+++ b/activitypub.py
@@ -21,7 +21,6 @@ from config import PUBLIC_INSTANCES
 import tasks
 
 from typing import List, Optional, Dict, Any, Union
-from typing import TypeVar
 
 logger = logging.getLogger(__name__)
 
@@ -345,7 +344,7 @@ class BaseActivity(object):
             self._post_to_outbox(obj_id, activity, recipients)
             logger.debug(f'called post to outbox hook')
         except NotImplementedError:
-            logger.debug('post to outbox hook not implemented')            
+            logger.debug('post to outbox hook not implemented')
 
         generate_signature(activity, KEY.privkey)
         payload = json.dumps(activity)
diff --git a/docker-compose-dev.yml b/docker-compose-dev.yml
index 0967722..bf6b0ee 100644
--- a/docker-compose-dev.yml
+++ b/docker-compose-dev.yml
@@ -1,4 +1,4 @@
-version: '3'
+version: '2'
 services:
   celery:
     build: .
diff --git a/docker-compose-tests.yml b/docker-compose-tests.yml
index d45609b..06f3f05 100644
--- a/docker-compose-tests.yml
+++ b/docker-compose-tests.yml
@@ -15,6 +15,7 @@ services:
      - MICROBLOGPUB_MONGODB_HOST=mongo:27017
      - MICROBLOGPUB_DEBUG=1
   celery:
+#    image: "instance1_web"
     build: .
     links:
      - mongo
diff --git a/docker-compose.yml b/docker-compose.yml
index c2dab44..74f92d8 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,4 @@
-version: '3'
+version: '2'
 services:
   web:
     build: .