diff --git a/contrib/fuzzystrmatch/dmetaphone.c b/contrib/fuzzystrmatch/dmetaphone.c
index 16e4c66167..bff20b37e6 100644
--- a/contrib/fuzzystrmatch/dmetaphone.c
+++ b/contrib/fuzzystrmatch/dmetaphone.c
@@ -52,7 +52,7 @@
 /***************************** COPYRIGHT NOTICES ***********************
 
 Most of this code is directly from the Text::DoubleMetaphone perl module
-version 0.05 available from http://www.cpan.org.
+version 0.05 available from https://www.cpan.org/.
 It bears this copyright notice:
 
 
diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 638ffc9fe8..d17b6ff8f0 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -71,7 +71,7 @@
     <term><acronym>CPAN</acronym></term>
     <listitem>
      <para>
-      <ulink url="http://www.cpan.org/">Comprehensive Perl Archive Network</ulink>
+      <ulink url="https://www.cpan.org/">Comprehensive Perl Archive Network</ulink>
      </para>
     </listitem>
    </varlistentry>
diff --git a/doc/src/sgml/external-projects.sgml b/doc/src/sgml/external-projects.sgml
index 347b830736..df5ca54984 100644
--- a/doc/src/sgml/external-projects.sgml
+++ b/doc/src/sgml/external-projects.sgml
@@ -65,7 +65,7 @@
       <entry>DBD::Pg</entry>
       <entry>Perl</entry>
       <entry>Perl DBI driver</entry>
-      <entry><ulink url="http://search.cpan.org/dist/DBD-Pg/"></ulink></entry>
+      <entry><ulink url="https://metacpan.org/release/DBD-Pg/"></ulink></entry>
      </row>
 
      <row>
diff --git a/doc/src/sgml/install-windows.sgml b/doc/src/sgml/install-windows.sgml
index 02d2c6f846..e345471c85 100644
--- a/doc/src/sgml/install-windows.sgml
+++ b/doc/src/sgml/install-windows.sgml
@@ -473,7 +473,7 @@ $ENV{CONFIG}="Debug";
       ActiveState Perl installation, nor in the ActiveState Perl Package
       Manager (PPM) library. To install, download the
       <filename>IPC-Run-&lt;version&gt;.tar.gz</filename> source archive from CPAN,
-      at <ulink url="http://search.cpan.org/dist/IPC-Run/"></ulink>, and
+      at <ulink url="https://metacpan.org/release/IPC-Run/"></ulink>, and
       uncompress. Edit the <filename>buildenv.pl</filename> file, and add a PERL5LIB
       variable to point to the <filename>lib</filename> subdirectory from the
       extracted archive. For example:
diff --git a/src/test/perl/PostgresNode.pm b/src/test/perl/PostgresNode.pm
index d12dd60e73..5f848a0db7 100644
--- a/src/test/perl/PostgresNode.pm
+++ b/src/test/perl/PostgresNode.pm
@@ -1222,7 +1222,7 @@ sub psql
 	# and set the flag.  Otherwise, and for any other exception, rethrow.
 	#
 	# For background, see
-	# http://search.cpan.org/~ether/Try-Tiny-0.24/lib/Try/Tiny.pm
+	# https://metacpan.org/pod/release/ETHER/Try-Tiny-0.24/lib/Try/Tiny.pm
 	do
 	{
 		local $@;