diff --git a/scraper/src/libretexts2zim/entrypoint.py b/scraper/src/libretexts2zim/entrypoint.py
index 0cdd6dd..2ed9c37 100644
--- a/scraper/src/libretexts2zim/entrypoint.py
+++ b/scraper/src/libretexts2zim/entrypoint.py
@@ -60,6 +60,13 @@ def main() -> None:
         default=os.getenv("LIBRETEXTS_ZIMUI_DIST", "../zimui/dist"),
     )
 
+    parser.add_argument(
+        "--overwrite",
+        help="Do not fail if ZIM already exists, overwrite it",
+        action="store_true",
+        default=False,
+    )
+
     # ZIM configuration flags
     ZimConfig.add_flags(
         parser,
@@ -94,6 +101,7 @@ def main() -> None:
             output_folder=args.output_folder,
             zimui_dist=args.zimui_dist,
             content_filter=doc_filter,
+            overwrite_existing_zim=args.overwrite,
         ).run()
     except Exception as e:
         logger.exception(e)
diff --git a/scraper/src/libretexts2zim/generator.py b/scraper/src/libretexts2zim/generator.py
index f857713..314e03c 100644
--- a/scraper/src/libretexts2zim/generator.py
+++ b/scraper/src/libretexts2zim/generator.py
@@ -109,6 +109,8 @@ def __init__(
         content_filter: ContentFilter,
         output_folder: str,
         zimui_dist: str,
+        *,
+        overwrite_existing_zim: bool,
     ) -> None:
         """Initializes Generator.
 
@@ -117,12 +119,15 @@ def __init__(
             zim_config: Configuration for ZIM metadata.
             content_filter: User supplied filter selecting with content to convert.
             output_folder: Directory to write ZIMs into.
+            zimui_dist: Directory to write ZIMs into.
+            overwrite_existing_zim: Do not fail if ZIM already exists, overwrite it.
         """
         self.libretexts_client = libretexts_client
         self.zim_config = zim_config
         self.doc_filter = content_filter
         self.output_folder = output_folder
         self.zimui_dist = Path(zimui_dist)
+        self.overwrite_existing_zim = overwrite_existing_zim
 
         os.makedirs(self.output_folder, exist_ok=True)
 
@@ -154,7 +159,7 @@ def run(self) -> Path:
         formatted_config = self.zim_config.format(metadata.placeholders())
         zim_path = Path(self.output_folder, f"{formatted_config.file_name_format}.zim")
 
-        if zim_path.exists():
+        if zim_path.exists() and not self.overwrite_existing_zim:
             logger.error(f"  {zim_path} already exists, aborting.")
             raise SystemExit(f"ZIM file already exists at {zim_path}")