diff --git a/scripts/unicode.py b/scripts/unicode.py
index 88c775b..7786dc1 100644
--- a/scripts/unicode.py
+++ b/scripts/unicode.py
@@ -21,7 +21,7 @@ import collections
 import urllib.request
 
 UNICODE_VERSION = "13.0.0"
-UCD_URL = "http://www.unicode.org/Public/%s/ucd/" % UNICODE_VERSION
+UCD_URL = "https://www.unicode.org/Public/%s/ucd/" % UNICODE_VERSION
 
 PREAMBLE = """// Copyright 2012-2018 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at