diff --git a/utils/base/BaseComicEntity.py b/utils/base/BaseComicEntity.py
index c175899..1fa5c31 100644
--- a/utils/base/BaseComicEntity.py
+++ b/utils/base/BaseComicEntity.py
@@ -141,7 +141,7 @@ class baseComic:
             is_next = verUtils.verNextCBZ(list_img)
             repeat = 1 
             while not is_next and repeat <= 2:
-                download_images(list_img,ci.getDirComicChapter(), files_name=files_name,timeout=20)
+                download_images(list_img,ci.getDirComicChapter(), files_name=files_name,concurrency=5,timeout=60)
                 is_next = len(",".join(os.listdir(ci.getDirComicChapter())).split(".jpg"))-1 == len(list_img)
                 if not is_next:
                     sleep_time = 3+int(repeat)*2
diff --git a/utils/downloader.py b/utils/downloader.py
index 4e15b03..4399387 100644
--- a/utils/downloader.py
+++ b/utils/downloader.py
@@ -68,7 +68,7 @@ def download_image(image_url, dst_dir, file_name, timeout=20, proxy_type=None, p
             print("## Fail:  {}  {}".format(image_url, e.args))
 
 
-def download_images(image_urls, dst_dir,timeout=20, proxy_type=None, proxy=None,files_name=None):
+def download_images(image_urls, dst_dir,timeout=30,concurrency=None, proxy_type=None, proxy=None,files_name=None):
     """
     Download image according to given urls and automatically rename them in order.
     :param timeout:
@@ -80,7 +80,8 @@ def download_images(image_urls, dst_dir,timeout=20, proxy_type=None, proxy=None,
     :param concurrency: number of requests process simultaneously
     :return: none
     """
-    concurrency = len(image_urls)
+    if concurrency == None:
+        concurrency = len(image_urls)
     with concurrent.futures.ThreadPoolExecutor(max_workers=concurrency) as executor:
         future_list = list()
         count = 0