diff --git a/doc/src/sgml/charset.sgml b/doc/src/sgml/charset.sgml
index a76733a9884..33b1b15d678 100644
--- a/doc/src/sgml/charset.sgml
+++ b/doc/src/sgml/charset.sgml
@@ -744,8 +744,8 @@ CREATE COLLATION german (provider = libc, locale = 'de_DE');
     set that is preloaded by <command>initdb</command>.  Users are encouraged
     to define their own collation objects that make use of these facilities to
     suit the sorting behavior to their requirements.
-    See <ulink url="http://userguide.icu-project.org/locale"></ulink>
-    and <ulink url="http://userguide.icu-project.org/collation/api"></ulink> for
+    See <ulink url="https://unicode-org.github.io/icu/userguide/locale/"></ulink>
+    and <ulink url="https://unicode-org.github.io/icu/userguide/collation/api.html"></ulink> for
     information on ICU locale naming.  The set of acceptable names and
     attributes depends on the particular ICU version.
    </para>
@@ -837,12 +837,8 @@ CREATE COLLATION german (provider = libc, locale = 'de_DE');
     and <ulink url="https://tools.ietf.org/html/bcp47">BCP 47</ulink> for
     details.  The list of possible collation types (<literal>co</literal>
     subtag) can be found in
-    the <ulink url="http://www.unicode.org/repos/cldr/trunk/common/bcp47/collation.xml">CLDR
+    the <ulink url="https://github.com/unicode-org/cldr/blob/master/common/bcp47/collation.xml">CLDR
     repository</ulink>.
-    The <ulink url="https://ssl.icu-project.org/icu-bin/locexp">ICU Locale
-    Explorer</ulink> can be used to check the details of a particular locale
-    definition.  The examples using the <literal>k*</literal> subtags require
-    at least ICU version 54.
    </para>
 
    <para>