diff --git a/models.py b/models.py
index bd73c60..3de4e16 100644
--- a/models.py
+++ b/models.py
@@ -18,6 +18,7 @@ class Book(Base):
     id: Mapped[int] = mapped_column(primary_key=True, index=True)
     title: Mapped[str] = mapped_column(String(255), index=True)
     author: Mapped[str] = mapped_column(String(255))
+    publisher: Mapped[str] = mapped_column(String(255), nullable=False)
 
 # Pydantic models
 class BookIn(BaseModel):
@@ -25,6 +26,7 @@ class BookIn(BaseModel):
 
     title: str
     author: str
+    publisher: str = ""
 
 
 class BookOut(BaseModel):
@@ -33,5 +35,6 @@ class BookOut(BaseModel):
     id: int
     title: str
     author: str
+    publisher: str
 
     model_config = ConfigDict(from_attributes=True)
diff --git a/repositories.py b/repositories.py
index dc9ff88..4fa11e7 100644
--- a/repositories.py
+++ b/repositories.py
@@ -4,7 +4,7 @@
 
 # Create a new book
 def create_book(db: Session, book: models.BookIn):
-    db_book = models.Book(title=book.title, author=book.author)
+    db_book = models.Book(title=book.title, author=book.author, publisher=book.publisher)
     db.add(db_book)
     db.commit()
     db.refresh(db_book)
@@ -27,6 +27,7 @@ def update_book(db: Session, book_id: int, book: models.BookIn):
     if db_book:
         db_book.title = book.title
         db_book.author = book.author
+        db_book.publisher = book.publisher
         db.commit()
         db.refresh(db_book)
         return db_book