diff --git a/__init__.py b/__init__.py
index ca9661c..83652c0 100644
--- a/__init__.py
+++ b/__init__.py
@@ -36,8 +36,10 @@ def download_cover(self, log, result_queue, abort,
 
 def get_cover_urls(log, title, authors, identifiers, timeout):
     sources = frozenset([
-        'http://z2-ec2.images-amazon.com/images/P/{0}.01.MAIN._SCRM_.jpg',
-        'https://s3.cn-north-1.amazonaws.com.cn/sitbweb-cn/content/{0}/images/cover.jpg',
+        'https://ec2.images-amazon.com/images/P/{0}.01.MAIN._SCRM_.jpg',
+        # No longer seem to work as of 2024-02-04:
+        #'http://z2-ec2.images-amazon.com/images/P/{0}.01.MAIN._SCRM_.jpg',
+        #'https://s3.cn-north-1.amazonaws.com.cn/sitbweb-cn/content/{0}/images/cover.jpg',
     ])
     urls = set()
     asins = set()