diff --git a/INSTALL.md b/INSTALL.md
index 1c20468..af92ac1 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -24,7 +24,7 @@ First, install the package:
 [debian-package]: https://packages.debian.org/zsh-syntax-highlighting
 [fedora-package]: https://apps.fedoraproject.org/packages/zsh-syntax-highlighting
 [fedora-package-alt]: https://bodhi.fedoraproject.org/updates/?packages=zsh-syntax-highlighting
-[freebsd-port]: http://www.freshports.org/textproc/zsh-syntax-highlighting/
+[freebsd-port]: https://www.freshports.org/textproc/zsh-syntax-highlighting/
 [gentoo-repository]: https://packages.gentoo.org/packages/app-shells/zsh-syntax-highlighting
 [netbsd-port]: http://cvsweb.netbsd.org/bsdweb.cgi/pkgsrc/shells/zsh-syntax-highlighting/
 [obs-repository]: https://software.opensuse.org/download.html?project=shells%3Azsh-users%3Azsh-syntax-highlighting&package=zsh-syntax-highlighting
diff --git a/changelog.md b/changelog.md
index 861fea5..e56f259 100644
--- a/changelog.md
+++ b/changelog.md
@@ -735,7 +735,7 @@ in this area.
 
 ## Developer-visible changes:
 
-- Test harness converted to [TAP](http://testanything.org/tap-specification.html) format
+- Test harness converted to [TAP](https://testanything.org/tap-specification.html) format
   (d99aa58aaaef, et seq)
 
 - Run each test in a separate subprocess, isolating them from each other
diff --git a/docs/highlighters/regexp.md b/docs/highlighters/regexp.md
index b1bed91..8c711a3 100644
--- a/docs/highlighters/regexp.md
+++ b/docs/highlighters/regexp.md
@@ -59,7 +59,7 @@ See also: [regular expressions tutorial][perlretut], zsh regexp operator `=~`
 in [the `zshmisc(1)` manual page][zshmisc-Conditional-Expressions]
 
 [zshzle-Character-Highlighting]: https://zsh.sourceforge.io/Doc/Release/Zsh-Line-Editor.html#Character-Highlighting
-[perlretut]: http://perldoc.perl.org/perlretut.html
+[perlretut]: https://perldoc.perl.org/perlretut
 [zshmisc-Conditional-Expressions]: https://zsh.sourceforge.io/Doc/Release/Conditional-Expressions.html#Conditional-Expressions
 [MAN_ZSH_REGEX]: https://zsh.sourceforge.io/Doc/Release/Zsh-Modules.html#The-zsh_002fregex-Module
 [pcresyntax]: https://www.pcre.org/original/doc/html/pcresyntax.html
diff --git a/tests/README.md b/tests/README.md
index cb3d943..eefeb54 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -104,7 +104,7 @@ By default, the results of all tests will be printed; to show only "interesting"
 results (tests that failed but were expected to succeed, or vice-versa), run
 `make quiet-test` (or `make test QUIET=y`).
 
-[TAP]: http://testanything.org/
+[TAP]: https://testanything.org/
 
 
 Performance test
diff --git a/zsh-syntax-highlighting.zsh b/zsh-syntax-highlighting.zsh
index bec0189..7827256 100644
--- a/zsh-syntax-highlighting.zsh
+++ b/zsh-syntax-highlighting.zsh
@@ -76,7 +76,7 @@ _zsh_highlight__is_function_p() {
 # will succeed.  In particular, if F has been marked for autoloading
 # but is not available in $fpath, then calling this function on F will return False.
 #
-# See users/21671 http://www.zsh.org/cgi-bin/mla/redirect?USERNUMBER=21671
+# See users/21671 https://www.zsh.org/cgi-bin/mla/redirect?USERNUMBER=21671
 _zsh_highlight__function_callable_p() {
   if _zsh_highlight__is_function_p "$1" &&
      ! _zsh_highlight__function_is_autoload_stub_p "$1"
@@ -100,7 +100,7 @@ _zsh_highlight__function_callable_p() {
 # -------------------------------------------------------------------------------------------------
 
 # Use workaround for bug in ZSH?
-# zsh-users/zsh@48cadf4 http://www.zsh.org/mla/workers//2017/msg00034.html
+# zsh-users/zsh@48cadf4 https://www.zsh.org/mla/workers/2017/msg00034.html
 autoload -Uz is-at-least
 if is-at-least 5.4; then
   typeset -g zsh_highlight__pat_static_bug=false