diff --git a/lib/time/README b/lib/time/README
index edb8dccd26..0de06df13b 100644
--- a/lib/time/README
+++ b/lib/time/README
@@ -5,6 +5,6 @@ The IANA asserts that the database is in the public domain.
 For more information, see
 https://www.iana.org/time-zones
 ftp://ftp.iana.org/tz/code/tz-link.html
-http://tools.ietf.org/html/rfc6557
+https://datatracker.ietf.org/doc/html/rfc6557
 
 To rebuild the archive, read and run update.bash.