diff --git a/src/time/tzdata/generate_zipdata.go b/src/time/tzdata/generate_zipdata.go
index 64b5b1b22c..0869c8458c 100644
--- a/src/time/tzdata/generate_zipdata.go
+++ b/src/time/tzdata/generate_zipdata.go
@@ -31,8 +31,8 @@ const header = `// Copyright 2020 The Go Authors. All rights reserved.
 
 // For more information, see
 // https://www.iana.org/time-zones
-// ftp://ftp.iana.org/tz/code/tz-link.htm
-// http://tools.ietf.org/html/rfc6557
+// ftp://ftp.iana.org/tz/code/tz-link.html
+// https://datatracker.ietf.org/doc/html/rfc6557
 
 package tzdata
 
diff --git a/src/time/tzdata/zipdata.go b/src/time/tzdata/zipdata.go
index 03b59720e2..60c0784008 100644
--- a/src/time/tzdata/zipdata.go
+++ b/src/time/tzdata/zipdata.go
@@ -11,8 +11,8 @@
 
 // For more information, see
 // https://www.iana.org/time-zones
-// ftp://ftp.iana.org/tz/code/tz-link.htm
-// http://tools.ietf.org/html/rfc6557
+// ftp://ftp.iana.org/tz/code/tz-link.html
+// https://datatracker.ietf.org/doc/html/rfc6557
 
 package tzdata