diff --git a/requirements.txt b/requirements.txt
index f569fd22..0098b044 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -31,6 +31,6 @@ premailer==2.8.1
 django-transactional-cleanup==0.1.14
 lxml==3.4.1
 git+https://github.com/Xof/django-pglocks.git@dbb8d7375066859f897604132bd437832d2014ea
-django-bulk-update==1.1.3
+
 # Comment it if you are using python >= 3.4
 enum34==1.0
diff --git a/taiga/projects/serializers.py b/taiga/projects/serializers.py
index 638a3329..48791495 100644
--- a/taiga/projects/serializers.py
+++ b/taiga/projects/serializers.py
@@ -305,6 +305,7 @@ class ProjectSerializer(serializers.ModelSerializer):
     my_permissions = serializers.SerializerMethodField("get_my_permissions")
     i_am_owner = serializers.SerializerMethodField("get_i_am_owner")
     tags_colors = TagsColorsField(required=False)
+    users = serializers.SerializerMethodField("get_users")
     total_closed_milestones = serializers.SerializerMethodField("get_total_closed_milestones")
 
     class Meta:
@@ -327,6 +328,9 @@ class ProjectSerializer(serializers.ModelSerializer):
             return is_project_owner(self.context["request"].user, obj)
         return False
 
+    def get_users(self, obj):
+        return UserSerializer(obj.members.all(), many=True).data
+
     def get_total_closed_milestones(self, obj):
         return obj.milestones.filter(closed=True).count()
 
@@ -351,7 +355,6 @@ class ProjectDetailSerializer(ProjectSerializer):
     issue_types = IssueTypeSerializer(many=True, required=False)
     priorities = PrioritySerializer(many=True, required=False)               # Issues
     severities = SeveritySerializer(many=True, required=False)
-    users = serializers.SerializerMethodField("get_users")
     userstory_custom_attributes = UserStoryCustomAttributeSerializer(source="userstorycustomattributes",
                                                                      many=True, required=False)
     task_custom_attributes = TaskCustomAttributeSerializer(source="taskcustomattributes",
@@ -371,8 +374,6 @@ class ProjectDetailSerializer(ProjectSerializer):
         serializer = ProjectRoleSerializer(obj.roles.all(), many=True)
         return serializer.data
 
-    def get_users(self, obj):
-        return UserSerializer(obj.members.all(), many=True).data
 
 class ProjectDetailAdminSerializer(ProjectDetailSerializer):
     class Meta:
diff --git a/taiga/timeline/models.py b/taiga/timeline/models.py
index 7558da15..52882850 100644
--- a/taiga/timeline/models.py
+++ b/taiga/timeline/models.py
@@ -37,8 +37,8 @@ class Timeline(models.Model):
     created = models.DateTimeField(default=timezone.now)
 
     def save(self, *args, **kwargs):
-        #if self.id:
-        #    raise ValidationError("Not modify allowed for timeline entries")
+        if self.id:
+            raise ValidationError("Not modify allowed for timeline entries")
         return super().save(*args, **kwargs)
 
     class Meta:
diff --git a/taiga/timeline/timeline_implementations.py b/taiga/timeline/timeline_implementations.py
index ca8c7016..69f5f83f 100644
--- a/taiga/timeline/timeline_implementations.py
+++ b/taiga/timeline/timeline_implementations.py
@@ -75,11 +75,7 @@ def task_timeline(instance, extra_data={}):
     result ={
         "task": service.extract_task_info(instance),
         "project": service.extract_project_info(instance.project),
-        "userstory": None,
     }
-    if instance.user_story:
-        result["userstory"] = service.extract_userstory_info(instance.user_story)
-        
     result.update(extra_data)
     return result