diff --git a/tests/GLASS.utf8 b/tests/GLASS.utf8
index ce4e267cf..282b747ed 100644
--- a/tests/GLASS.utf8
+++ b/tests/GLASS.utf8
@@ -1,6 +1,7 @@
 I Can Eat Glass
 In various languages
 
+# http://kermitproject.org does not support https://
 Adopted from http://kermitproject.org/utf8.html#glass
 Submit additions to the URL above and update this file.
 
diff --git a/tests/README.xterm b/tests/README.xterm
index cfc5876a5..3a6f08c3a 100644
--- a/tests/README.xterm
+++ b/tests/README.xterm
@@ -2,5 +2,5 @@
 Instead of adding all of xterm's tests, download the file from [1] and 
 use the scripts in xterm-VERSION/vttests
 
-[1] http://invisible-island.net/datafiles/release/xterm.tar.gz
+[1] https://invisible-island.net/datafiles/release/xterm.tar.gz
 
diff --git a/tests/UTF-8-demo.txt b/tests/UTF-8-demo.txt
index 4363f27bd..6017f34d0 100644
--- a/tests/UTF-8-demo.txt
+++ b/tests/UTF-8-demo.txt
@@ -2,7 +2,7 @@
 UTF-8 encoded sample plain-text file
 ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
 
-Markus Kuhn [ˈmaʳkʊs kuːn] <http://www.cl.cam.ac.uk/~mgk25/> — 2002-07-25
+Markus Kuhn [ˈmaʳkʊs kuːn] <https://www.cl.cam.ac.uk/~mgk25/> — 2002-07-25
 
 
 The ASCII compatible UTF-8 encoding used in this plain-text file
diff --git a/tests/boxes.txt b/tests/boxes.txt
index cb2df8cfb..cf8cd4c7a 100644
--- a/tests/boxes.txt
+++ b/tests/boxes.txt
@@ -137,6 +137,6 @@ Block elements.
 █▓▒░ ▕ ▏ ▐# ▌#
 
 
-VT-102:  http://vt100.net/docs/vt102-ug/table5-13.html
-Unicode: http://www.unicode.org/charts/PDF/U2500.pdf
-     and http://www.unicode.org/charts/PDF/U2580.pdf
+VT-102:  https://vt100.net/docs//vt102-ug/contents.html
+Unicode: https://www.unicode.org/charts/PDF/U2500.pdf
+     and https://www.unicode.org/charts/PDF/U2580.pdf