diff --git a/libstdc++-v3/doc/html/manual/streambufs.html b/libstdc++-v3/doc/html/manual/streambufs.html
index d3c592177f0..e299d70cb0f 100644
--- a/libstdc++-v3/doc/html/manual/streambufs.html
+++ b/libstdc++-v3/doc/html/manual/streambufs.html
@@ -6,7 +6,7 @@
     </p><p>Creating your own stream buffers for I/O can be remarkably easy.
       If you are interested in doing so, we highly recommend two very
       excellent books:
-      <a class="link" href="http://www.angelikalanger.com/iostreams.html" target="_top">Standard C++
+      <a class="link" href="https://angelikalanger.com/iostreams.html" target="_top">Standard C++
       IOStreams and Locales</a> by Langer and Kreft, ISBN 0-201-18395-1, and
       <a class="link" href="http://www.josuttis.com/libbook/" target="_top">The C++ Standard Library</a>
       by Nicolai Josuttis, ISBN 0-201-37926-0.  Both are published by
diff --git a/libstdc++-v3/doc/xml/manual/io.xml b/libstdc++-v3/doc/xml/manual/io.xml
index 8380683561a..d6fe2ce841d 100644
--- a/libstdc++-v3/doc/xml/manual/io.xml
+++ b/libstdc++-v3/doc/xml/manual/io.xml
@@ -190,7 +190,7 @@
    <para>Creating your own stream buffers for I/O can be remarkably easy.
       If you are interested in doing so, we highly recommend two very
       excellent books:
-      <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.angelikalanger.com/iostreams.html">Standard C++
+      <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://angelikalanger.com/iostreams.html">Standard C++
       IOStreams and Locales</link> by Langer and Kreft, ISBN 0-201-18395-1, and
       <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.josuttis.com/libbook/">The C++ Standard Library</link>
       by Nicolai Josuttis, ISBN 0-201-37926-0.  Both are published by