diff --git a/crypto/compat/ui_openssl_win.c b/crypto/compat/ui_openssl_win.c
index a8c92f28f7..09705e48d9 100644
--- a/crypto/compat/ui_openssl_win.c
+++ b/crypto/compat/ui_openssl_win.c
@@ -20,7 +20,7 @@
  * 3. All advertising materials mentioning features or use of this
  *    software must display the following acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
- *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *    for use in the OpenSSL Toolkit. (https://www.openssl.org/)"
  *
  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  *    endorse or promote products derived from this software without
@@ -34,7 +34,7 @@
  * 6. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
- *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *    for use in the OpenSSL Toolkit (https://www.openssl.org/)"
  *
  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
diff --git a/m4/check-os-options.m4 b/m4/check-os-options.m4
index c73709dbb5..77edd14c91 100644
--- a/m4/check-os-options.m4
+++ b/m4/check-os-options.m4
@@ -22,7 +22,7 @@ case $host_os in
 		# Don't use arc4random on systems before 10.12 because of
 		# weak seed on failure to open /dev/random, based on latest
 		# public source:
-		# http://www.opensource.apple.com/source/Libc/Libc-997.90.3/gen/FreeBSD/arc4random.c
+		# https://www.opensource.apple.com/source/Libc/Libc-997.90.3/gen/FreeBSD/arc4random.c
 		#
 		# We use the presence of getentropy() to detect 10.12. The
 		# following check take into account that:
diff --git a/tap-driver.sh b/tap-driver.sh
index fea066f56e..1e444b2a6a 100755
--- a/tap-driver.sh
+++ b/tap-driver.sh
@@ -131,9 +131,8 @@ fi
     # expects on its last input line (which is displayed below by the
     # last `echo $?' statement), and would thus die reporting an internal
     # error.
-    # For more information, see the Autoconf manual and the threads:
+    # For more information, see the Autoconf manual and the thread:
     # <https://lists.gnu.org/archive/html/bug-autoconf/2011-09/msg00004.html>
-    # <http://mail.opensolaris.org/pipermail/ksh93-integration-discuss/2009-February/004121.html>
     trap : 1 3 2 13 15
     if test $merge -gt 0; then
       exec 2>&1
@@ -464,7 +463,7 @@ function get_test_exit_message(status)
     # in $? an exit status of 256+n instead of the more standard 128+n.
     # Apparently, both behaviours are allowed by POSIX (2008), so be
     # prepared to handle them both.  See also Austing Group report ID
-    # 0000051 <http://www.austingroupbugs.net/view.php?id=51>
+    # 0000051 <https://www.austingroupbugs.net/view.php?id=51>
     exit_details = sprintf(" (terminated by signal %d?)", status - 256)
   else
     # Never seen in practice.