diff --git a/doc/appendix-packages.xml b/doc/appendix-packages.xml
index 32698b70..5138a17c 100644
--- a/doc/appendix-packages.xml
+++ b/doc/appendix-packages.xml
@@ -291,7 +291,7 @@
           <tbody>
             <row>
               <entry>Repository URL:</entry>
-              <entry><ulink url="http://apt.postgresql.org/">http://apt.postgresql.org/</ulink></entry>
+              <entry><ulink url="https://apt.postgresql.org/">https://apt.postgresql.org/</ulink></entry>
             </row>
             <row>
               <entry>Repository documentation:</entry>
diff --git a/doc/install-packages.xml b/doc/install-packages.xml
index d6249144..371fae31 100644
--- a/doc/install-packages.xml
+++ b/doc/install-packages.xml
@@ -37,7 +37,7 @@
   <para>
    RPM packages for &repmgr; are also available via Yum through
    the PostgreSQL Global Development Group (PGDG) RPM repository
-   (<ulink url="https://yum.postgresql.org/">http://yum.postgresql.org/</ulink>).
+   (<ulink url="https://yum.postgresql.org/">https://yum.postgresql.org/</ulink>).
    Follow the instructions for your distribution (RedHat, CentOS,
    Fedora, etc.) and architecture as detailed there. Note that it can take some days
    for new &repmgr; packages to become available via the this repository.
@@ -206,7 +206,7 @@ repmgr11.x86_64                        4.4-1.el7                             2nd
   </indexterm>
 
   <para>.deb packages for &repmgr; are available from the
-  PostgreSQL Community APT repository (<ulink url="http://apt.postgresql.org/">http://apt.postgresql.org/</ulink>).
+  PostgreSQL Community APT repository (<ulink url="https://apt.postgresql.org/">https://apt.postgresql.org/</ulink>).
   Instructions can be found in the APT section of the PostgreSQL Wiki
   (<ulink url="https://wiki.postgresql.org/wiki/Apt">https://wiki.postgresql.org/wiki/Apt</ulink>).
   </para>
diff --git a/doc/install-source.xml b/doc/install-source.xml
index 0705408c..c7013dbe 100644
--- a/doc/install-source.xml
+++ b/doc/install-source.xml
@@ -24,8 +24,7 @@
     <listitem>
      <para>
       <literal>Debian</literal> and <literal>Ubuntu</literal>: First
-      add the <ulink
-      url="http://apt.postgresql.org/">apt.postgresql.org</ulink>
+      add the <ulink url="https://apt.postgresql.org/">apt.postgresql.org</ulink>
       repository to your <filename>sources.list</filename> if you
       have not already done so, and ensure the source repository is enabled.
      </para>
@@ -36,8 +35,8 @@
          line in the repository file, which is usually
          <filename>/etc/apt/sources.list.d/pgdg.list</filename>, e.g.:
          <programlisting>
-deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main
-deb-src http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main</programlisting>
+deb https://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main
+deb-src https://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main</programlisting>
        </para>
      </tip>
      <para>