diff --git a/src/server/BreCal/schemas/model.py b/src/server/BreCal/schemas/model.py
index 193c3f4..1cbdf21 100644
--- a/src/server/BreCal/schemas/model.py
+++ b/src/server/BreCal/schemas/model.py
@@ -71,7 +71,7 @@ class ShipcallSchema(Schema):
     ship_id = fields.Int()
     type = fields.Int()
     eta = fields.DateTime(Required = False, allow_none=True)
-    voyage = fields.Str(Required = False, allow_none=True)
+    voyage = fields.Str(allow_none=True, metadata={'Required':False}) # Solving: RemovedInMarshmallow4Warning: Passing field metadata as keyword arguments is deprecated. Use the explicit `metadata=...` argument instead. Additional metadata: {'Required': False}
     etd = fields.DateTime(Required = False, allow_none=True)
     arrival_berth_id = fields.Int(Required = False, allow_none=True)
     departure_berth_id = fields.Int(Required = False, allow_none=True)
@@ -91,7 +91,7 @@ class ShipcallSchema(Schema):
     moored_lock = fields.Bool(Required = False, allow_none=True)
     canceled = fields.Bool(Required = False, allow_none=True)
     evaluation = fields.Int(Required = False, allow_none=True)
-    evaluation_message = fields.Str(Required = False, allow_none=True)
+    evaluation_message = fields.Str(allow_none=True, metadata={'Required':False}) # Solving: RemovedInMarshmallow4Warning: Passing field metadata as keyword arguments is deprecated. Use the explicit `metadata=...` argument instead. Additional metadata: {'Required': False}
     participants = fields.List(fields.Nested(ParticipantAssignmentSchema))
     created = fields.DateTime(Required = False, allow_none=True)
     modified = fields.DateTime(Required = False, allow_none=True)
@@ -176,12 +176,12 @@ class UserSchema(Schema):
         super().__init__(unknown=None)
         pass
     id = fields.Int(required=True)
-    first_name = fields.Str(Required=False, allow_none=True)
-    last_name = fields.Str(required=False, allow_none=True)
-    user_phone = fields.Str(required=False, allow_none=True)
-    user_email = fields.Str(required=False, allow_none=True)
-    old_password = fields.Str(required=False, allow_none=True)
-    new_password = fields.Str(required=False, allow_none=True)
+    first_name = fields.Str(allow_none=True, metadata={'Required':False})
+    last_name = fields.Str(allow_none=True, metadata={'Required':False})
+    user_phone = fields.Str(allow_none=True, metadata={'Required':False})
+    user_email = fields.Str(allow_none=True, metadata={'Required':False})
+    old_password = fields.Str(allow_none=True, metadata={'Required':False})
+    new_password = fields.Str(allow_none=True, metadata={'Required':False})
 
 @dataclass
 class Times: