diff --git a/Makefile b/Makefile
index 7dcc46b..2f0fa87 100644
--- a/Makefile
+++ b/Makefile
@@ -62,5 +62,5 @@ help: .title
 	@echo '  $(CASK): $(if $(HAVE_CASK),yes,no)'
 	@echo ''
 	@echo 'You need $(CASK) to develop and test Esup.'
-	@echo 'See http://cask.readthedocs.io/ for more.'
+	@echo 'See https://cask.readthedocs.io/ for more.'
 	@echo ''
diff --git a/README.md b/README.md
index b1753be..ab71b40 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ of Emacs, but this is NOT guaranteed.  Bug reports for problems related to using
 Esup with older versions of Emacs will most like not be addressed.
 
 The master of all the material is the Git repository at
-http://github.com/jschaf/esup .
+https://github.com/jschaf/esup .
 
 NOTE: The `master` branch will always contain the latest _unstable_ version.  If
 you wish to check older versions or formal, tagged release, please switch to the
@@ -170,11 +170,11 @@ make test
 
 [actions badge]: https://github.com/jschaf/esup/workflows/build/badge.svg
 [actions link]: https://github.com/jschaf/esup/actions
-[melpa badge]: http://melpa.org/packages/esup-badge.svg
-[melpa link]: http://melpa.org/#/esup
+[melpa badge]: https://melpa.org/packages/esup-badge.svg
+[melpa link]: https://melpa.org/#/esup
 [melpa-s badge]: https://stable.melpa.org/packages/esup-badge.svg
 [melpa-s link]: https://stable.melpa.org/#/esup
-[esup tags]: http://github.com/jschaf/esup/tags
+[esup tags]: https://github.com/jschaf/esup/tags
 [melpa help]: https://melpa.org/#/getting-started
 [cask]: https://cask.github.io
 [ccov badge]: https://codecov.io/gh/jschaf/esup/branch/master/graph/badge.svg
diff --git a/esup-child.el b/esup-child.el
index 35f66a8..76f6ed6 100644
--- a/esup-child.el
+++ b/esup-child.el
@@ -5,7 +5,7 @@
 ;; Author: Joe Schafer <joe@jschaf.com>
 ;; Maintainer: Serghei Iakovlev <egrep@protonmail.ch>
 ;; Version: 0.7.1
-;; URL: http://github.com/jschaf/esup
+;; URL: https://github.com/jschaf/esup
 ;; Keywords: convenience, processes
 ;; Package-Requires: ((cl-lib "0.5") (emacs "25"))
 
diff --git a/esup.el b/esup.el
index e8d7d4d..a7fd421 100644
--- a/esup.el
+++ b/esup.el
@@ -5,7 +5,7 @@
 ;; Author: Joe Schafer <joe@jschaf.com>
 ;; Maintainer: Serghei Iakovlev <egrep@protonmail.ch>
 ;; Version: 0.7.1
-;; URL: http://github.com/jschaf/esup
+;; URL: https://github.com/jschaf/esup
 ;; Keywords: convenience, processes
 ;; Package-Requires: ((cl-lib "0.5") (emacs "25"))
 
diff --git a/test/test-esup.el b/test/test-esup.el
index f3cdb90..e4af918 100644
--- a/test/test-esup.el
+++ b/test/test-esup.el
@@ -5,7 +5,7 @@
 ;; Author: Joe Schafer <joe@jschaf.com>
 ;; Maintainer: Serghei Iakovlev <egrep@protonmail.ch>
 ;; Version: 0.7.1
-;; URL: http://github.com/jschaf/esup
+;; URL: https://github.com/jschaf/esup
 
 ;; This file is NOT part of GNU Emacs.
 
diff --git a/test/test-utils.el b/test/test-utils.el
index a047885..0da8381 100644
--- a/test/test-utils.el
+++ b/test/test-utils.el
@@ -5,7 +5,7 @@
 ;; Author: Joe Schafer <joe@jschaf.com>
 ;; Maintainer: Serghei Iakovlev <egrep@protonmail.ch>
 ;; Version: 0.7.1
-;; URL: http://github.com/jschaf/esup
+;; URL: https://github.com/jschaf/esup
 
 ;; This file is NOT part of GNU Emacs.
 
diff --git a/test/utils.el b/test/utils.el
index fe98a8f..4f91db5 100644
--- a/test/utils.el
+++ b/test/utils.el
@@ -5,7 +5,7 @@
 ;; Author: Joe Schafer <joe@jschaf.com>
 ;; Maintainer: Serghei Iakovlev <egrep@protonmail.ch>
 ;; Version: 0.7.1
-;; URL: http://github.com/jschaf/esup
+;; URL: https://github.com/jschaf/esup
 
 ;; This file is NOT part of GNU Emacs.