diff --git a/src/calibre/gui2/update.py b/src/calibre/gui2/update.py
index 770aed0036..8183b2c29a 100644
--- a/src/calibre/gui2/update.py
+++ b/src/calibre/gui2/update.py
@@ -25,7 +25,7 @@ def get_download_url():
             else 'osx' if isosx else 'linux')
     if which == 'windows' and is64bit:
         which += '64'
-    return 'http://calibre-ebook.com/download_' + which
+    return 'https://calibre-ebook.com/download_' + which
 
 def get_newest_version():
     try: