diff --git a/backend/src/project/models.py b/backend/src/project/models.py
index 627bee4a..389cc915 100644
--- a/backend/src/project/models.py
+++ b/backend/src/project/models.py
@@ -13,7 +13,7 @@ class Project(Base):
     deadline: Mapped[datetime] = mapped_column(
         DateTime(timezone=True), nullable=False)
     publish_date: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), nullable=True, default=datetime.now()
+        DateTime(timezone=True), nullable=True, default=datetime.now
     )
     name: Mapped[str] = mapped_column(nullable=False)
     subject_id: Mapped[int] = mapped_column(
diff --git a/backend/src/subject/models.py b/backend/src/subject/models.py
index 835182ba..cf257a82 100644
--- a/backend/src/subject/models.py
+++ b/backend/src/subject/models.py
@@ -24,7 +24,7 @@ class Subject(Base):
 
     id: Mapped[int] = mapped_column(primary_key=True)
     academic_year: Mapped[int] = mapped_column(
-        nullable=False, default=datetime.now().year)
-    uuid: Mapped[str] = mapped_column(default=str(uuid4()))
+        nullable=False, default=lambda _: datetime.now().year)
+    uuid: Mapped[str] = mapped_column(default=lambda _: str(uuid4()))
     email: Mapped[str] = mapped_column(nullable=True)
     name: Mapped[str]