diff --git a/server.py b/server.py
index 634f042..300bc86 100644
--- a/server.py
+++ b/server.py
@@ -82,17 +82,17 @@ async def create_upload_file(file: UploadFile | None, package: Annotated[str, Fo
 
         if os.path.exists(f"{dir_file}/{filename}"):
             os.remove(f"{dir_file}/{filename}")
-        with open(f"{dir_file}/{filename}", 'a') as f:
-            f.write(str(contents))
+        with open(f"{dir_file}/{filename}", 'wb') as f:
+            f.write(contents)
         if os.path.exists(f"{dir_last}/{filename}"):
             os.remove(f"{dir_last}/{filename}")
-        with open(f"{dir_last}/{filename}", 'a') as f:
-            f.write(str(contents))
+        with open(f"{dir_last}/{filename}", 'wb') as f:
+            f.write(contents)
         if stable:
             if os.path.exists(f"{dir_stable}/{filename}"):
                 os.remove(f"{dir_stable}/{filename}")
-            with open(f"{dir_stable}/{filename}", 'a') as f:
-                f.write(str(contents))
+            with open(f"{dir_stable}/{filename}", 'wb') as f:
+                f.write(contents)
     except Exception as err:
         return {"message": "There was an error uploading the file, error {err}".format(err=err)}
     finally: