diff --git a/models.py b/models.py
index f67b48b..c58df1c 100644
--- a/models.py
+++ b/models.py
@@ -1,5 +1,5 @@
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
-from sqlalchemy import String, Number
+from sqlalchemy import String, Float
 from pydantic import BaseModel, ConfigDict
 
 
@@ -18,7 +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))
-    price: Mapped[str] = mapped_column(Number(255), nullable=False)
+    price: Mapped[float] = mapped_column(Float, nullable=False)
 
 # Pydantic models
 class BookIn(BaseModel):
@@ -26,6 +26,7 @@ class BookIn(BaseModel):
 
     title: str
     author: str
+    price: float
 
 
 class BookOut(BaseModel):
@@ -35,4 +36,4 @@ class BookOut(BaseModel):
     title: str
     author: str
 
-    model_config = ConfigDict(from_attributes=True)
+    model_config = ConfigDict(from_attributes=True)
\ No newline at end of file
diff --git a/repositories.py b/repositories.py
index dc9ff88..e5cf32b 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, price=book.price)
     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.price = book.price
         db.commit()
         db.refresh(db_book)
         return db_book
diff --git a/test_main.py b/test_main.py
index 3fea397..0365a8f 100644
--- a/test_main.py
+++ b/test_main.py
@@ -5,8 +5,8 @@
 
 # Test data constants
 TEST_BOOKS = [
-    {"title": "Carrie", "author": "Stephen King"},
-    {"title": "Ready Player One", "author": "Ernest Cline"},
+    {"title": "Carrie", "author": "Stephen King", "price": 9.99},
+    {"title": "Ready Player One", "author": "Ernest Cline", "price": 14.99},
 ]
 
 class TestMainApp:
@@ -57,7 +57,7 @@ def test_update_book(self, test_db):
 
     def test_delete_book(self, test_db):
         """Test deleting a book"""
-        book = create_book(test_db, BookIn(title="To Delete", author="Author"))
+        book = create_book(test_db, BookIn(title="To Delete", author="Author", price=19.99))
         deleted_book = delete_book(test_db, book.id)
 
         assert deleted_book is not None
@@ -67,5 +67,5 @@ def test_delete_book(self, test_db):
     def test_nonexistent_operations(self, test_db):
         """Test operations on nonexistent books"""
         assert get_book(test_db, 999999) is None
-        assert update_book(test_db, 999999, BookIn(title="Test", author="Test")) is None
+        assert update_book(test_db, 999999, BookIn(title="Test", author="Test", price=10.00)) is None
         assert delete_book(test_db, 999999) is None