diff --git a/activitypub.py b/activitypub.py
index 80becfb..dbe7601 100644
--- a/activitypub.py
+++ b/activitypub.py
@@ -30,6 +30,15 @@ ObjectType = Dict[str, Any]
 ObjectOrIDType = Union[str, ObjectType]
 
 
+COLLECTION_CTX = [                      
+    "https://www.w3.org/ns/activitystreams",
+    "https://w3id.org/security/v1",              
+    {
+        "Hashtag": "as:Hashtag",
+        "sensitive": "as:sensitive",
+    }
+]
+
 class ActivityType(Enum):
     """Supported activity `type`."""
     ANNOUNCE = 'Announce'
@@ -1196,11 +1205,11 @@ def build_ordered_collection(col, q=None, cursor=None, map_func=None, limit=50,
     data = [_remove_id(doc) for doc in data]
     if map_func:
         data = [map_func(doc) for doc in data]
-
+      
     # No cursor, this is the first page and we return an OrderedCollection
     if not cursor:
         resp = {
-            '@context': CTX_AS,
+            '@context': COLLECTION_CTX,
             'id': f'{BASE_URL}/{col_name}',
             'totalItems': total_items,
             'type': ActivityType.ORDERED_COLLECTION.value,
@@ -1223,7 +1232,7 @@ def build_ordered_collection(col, q=None, cursor=None, map_func=None, limit=50,
 
     # If there's a cursor, then we return an OrderedCollectionPage
     resp = {
-        '@context': CTX_AS,
+        '@context': COLLECTION_CTX,
         'type': ActivityType.ORDERED_COLLECTION_PAGE.value,
         'id': BASE_URL + '/' + col_name + '?cursor=' + start_cursor,
         'totalItems': total_items,
diff --git a/app.py b/app.py
index be06f0e..227f318 100644
--- a/app.py
+++ b/app.py
@@ -601,9 +601,19 @@ def add_extra_collection(raw_doc: Dict[str, Any]) -> Dict[str, Any]:
     return raw_doc
 
 
-def activity_from_doc(raw_doc: Dict[str, Any]) -> Dict[str, Any]:
+def remove_context(activity: Dict[str, Any]) -> Dict[str, Any]:
+    if '@context' in activity:
+        del activity['@context']
+    return activity
+
+
+def activity_from_doc(raw_doc: Dict[str, Any], embed: bool = False) -> Dict[str, Any]:
     raw_doc = add_extra_collection(raw_doc)
-    return clean_activity(raw_doc['activity'])
+    activity = clean_activity(raw_doc['activity'])
+    if embed:
+        return remove_context(activity)
+    return activity
+
 
 
 @app.route('/outbox', methods=['GET', 'POST'])      
@@ -621,7 +631,7 @@ def outbox():
             DB.outbox,
             q=q,
             cursor=request.args.get('cursor'),
-            map_func=lambda doc: activity_from_doc(doc),
+            map_func=lambda doc: activity_from_doc(doc, embed=True),
         ))
 
     # Handle POST request
@@ -719,7 +729,7 @@ def outbox_activity_likes(item_id):
         DB.inbox,
         q=q,
         cursor=request.args.get('cursor'),
-        map_func=lambda doc: doc['activity'],
+        map_func=lambda doc: remove_context(doc['activity']),
         col_name=f'outbox/{item_id}/likes',
         first_page=request.args.get('page') == 'first',
     ))
@@ -748,7 +758,7 @@ def outbox_activity_shares(item_id):
         DB.inbox,
         q=q,
         cursor=request.args.get('cursor'),
-        map_func=lambda doc: doc['activity'],
+        map_func=lambda doc: remove_context(doc['activity']),
         col_name=f'outbox/{item_id}/shares',
         first_page=request.args.get('page') == 'first',
     ))
@@ -1008,7 +1018,7 @@ def inbox():
             DB.inbox,                               
             q={'meta.deleted': False},              
             cursor=request.args.get('cursor'),      
-            map_func=lambda doc: doc['activity'],   
+            map_func=lambda doc: remove_context(doc['activity']),   
         ))                                          
 
     data = request.get_json(force=True)