diff --git a/project/04-items-stores-smorest-sqlalchemy/schemas.py b/project/04-items-stores-smorest-sqlalchemy/schemas.py
index 2619c4ee..fbdcf3de 100644
--- a/project/04-items-stores-smorest-sqlalchemy/schemas.py
+++ b/project/04-items-stores-smorest-sqlalchemy/schemas.py
@@ -14,7 +14,7 @@ class PlainStoreSchema(Schema):
 
 class ItemSchema(PlainItemSchema):
     store_id = fields.Int(required=True, load_only=True)
-    store = fields.Nested(lambda: PlainStoreSchema(), dump_only=True)
+    store = fields.Nested(PlainStoreSchema(), dump_only=True)
 
 
 class ItemUpdateSchema(Schema):
diff --git a/project/05-add-many-to-many/schemas.py b/project/05-add-many-to-many/schemas.py
index 7fba5609..99b9c94a 100644
--- a/project/05-add-many-to-many/schemas.py
+++ b/project/05-add-many-to-many/schemas.py
@@ -19,8 +19,8 @@ class PlainTagSchema(Schema):
 
 class ItemSchema(PlainItemSchema):
     store_id = fields.Int(required=True, load_only=True)
-    store = fields.Nested(lambda: PlainStoreSchema(), dump_only=True)
-    tags = fields.List(fields.Nested(lambda: PlainTagSchema()), dump_only=True)
+    store = fields.Nested(PlainStoreSchema(), dump_only=True)
+    tags = fields.List(fields.Nested(PlainTagSchema()), dump_only=True)
 
 
 class ItemUpdateSchema(Schema):
@@ -30,7 +30,7 @@ class ItemUpdateSchema(Schema):
 
 class StoreSchema(PlainStoreSchema):
     items = fields.List(fields.Nested(PlainItemSchema()), dump_only=True)
-    tags = fields.List(fields.Nested(lambda: PlainTagSchema()), dump_only=True)
+    tags = fields.List(fields.Nested(PlainTagSchema()), dump_only=True)
 
 
 class TagSchema(PlainTagSchema):