diff -r cd5e8fb64b74 -r 56850f5c73f6 src/notes/api/views/core.py
--- a/src/notes/api/views/core.py	Tue Jul 10 15:18:03 2018 +0200
+++ b/src/notes/api/views/core.py	Wed Jul 18 17:32:09 2018 +0200
@@ -14,7 +14,8 @@
 from ..serializers.core import (CreateNoteSerializer, CreateSessionSerializer,
                                 DetailNoteSerializer, DetailSessionSerializer,
                                 ListNoteSerializer, ListSessionSerializer,
-                                RootDetailNoteSerializer, UpdateNoteSerializer)
+                                RootDetailNoteSerializer, UpdateNoteSerializer,
+                                UpdateSessionSerializer)
 
 logger = logging.getLogger(__name__)
 
@@ -28,9 +29,9 @@
 
     serializers = {
         'list': ListSessionSerializer,
-        'retrieve':  DetailSessionSerializer,
-        'update': CreateSessionSerializer,
-        'create':  CreateSessionSerializer,
+        'retrieve': DetailSessionSerializer,
+        'update': UpdateSessionSerializer,
+        'create': CreateSessionSerializer,
     }
 
     permission_classes = (SessionPermission,)