Issue #26736: Used HTTPS for external links in the documentation if possible.
diff --git a/Doc/howto/functional.rst b/Doc/howto/functional.rst
index 9d2991f..62792b8 100644
--- a/Doc/howto/functional.rst
+++ b/Doc/howto/functional.rst
@@ -1171,9 +1171,9 @@
Mertz also wrote a 3-part series of articles on functional programming
for IBM's DeveloperWorks site; see
-`part 1 <http://www.ibm.com/developerworks/linux/library/l-prog/index.html>`__,
-`part 2 <http://www.ibm.com/developerworks/linux/library/l-prog2/index.html>`__, and
-`part 3 <http://www.ibm.com/developerworks/linux/library/l-prog3/index.html>`__,
+`part 1 <https://www.ibm.com/developerworks/linux/library/l-prog/index.html>`__,
+`part 2 <https://www.ibm.com/developerworks/linux/library/l-prog2/index.html>`__, and
+`part 3 <https://www.ibm.com/developerworks/linux/library/l-prog3/index.html>`__,
Python documentation