diff --git a/src/api/src/create_book.py b/src/api/src/create_book.py
index a871bda..16fcb41 100644
--- a/src/api/src/create_book.py
+++ b/src/api/src/create_book.py
@@ -482,7 +482,7 @@ class PDFGenerator:
         # self.canvas = Canvas(self.file)
 
     async def add_chapters(self, contents: List[str], download_images: bool = False):
-        chapters = []
+        chapters: List[tempfile._TemporaryFileWrapper] = []
 
         for part, content in zip(self.data["parts"], contents):
             html = BeautifulSoup(content, features="lxml")
@@ -561,6 +561,9 @@ class PDFGenerator:
                 )
             )
 
+        for chapter in chapters:
+            chapter.file.close()
+
     def dump(self) -> PDFGenerator:
         self.file.seek(0)
 
diff --git a/src/api/src/main.py b/src/api/src/main.py
index fec5dd5..cc48579 100644
--- a/src/api/src/main.py
+++ b/src/api/src/main.py
@@ -182,7 +182,10 @@ async def handle_download(
         ):
             print(title)
 
-        book_bytes = book.dump().file.read()
+        book_file = book.dump().file
+        book_bytes = book_file.read()
+        book_file.close()
+
         match format:
             case DownloadFormat.epub:
                 media_type = "application/epub+zip"