diff --git a/COPYING b/COPYING
index 94a9ed0..f288702 100644
--- a/COPYING
+++ b/COPYING
@@ -1,7 +1,7 @@
                     GNU GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007
 
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
@@ -645,7 +645,7 @@ the "copyright" line and a pointer to where the full notice is found.
     GNU General Public License for more details.
 
     You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 Also add information on how to contact you by electronic and paper mail.
 
@@ -664,11 +664,11 @@ might be different; for a GUI interface, you would use an "about box".
   You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
+<https://www.gnu.org/licenses/>.
 
   The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/README b/README
index 27968c4..0f5562a 100644
--- a/README
+++ b/README
@@ -107,7 +107,7 @@ gzip and gunzip are distributed as a single program. zip and unzip
 are, for historical reasons, two separate programs, although the
 authors of these two programs work closely together in the Info-ZIP
 team. zip and unzip are not associated with the GNU project.
-See http://info-zip.org/ for more about zip and unzip.
+See https://infozip.sourceforge.net/ for more about zip and unzip.
 
 
 For any copyright year range specified as YYYY-ZZZZ in this package
diff --git a/README-hacking b/README-hacking
index 1343011..60e40ca 100644
--- a/README-hacking
+++ b/README-hacking
@@ -16,7 +16,7 @@ Specific development tools and versions will be checked for and listed by
 the bootstrap script.  See README-prereq for specific notes on obtaining
 these prerequisite tools.
 
-Valgrind <http://valgrind.org/> is also highly recommended, if
+Valgrind <https://valgrind.org/> is also highly recommended, if
 Valgrind supports your architecture.  See also README-valgrind
 (if present).
 
diff --git a/README-prereq b/README-prereq
index d12d1da..410ea8a 100644
--- a/README-prereq
+++ b/README-prereq
@@ -10,7 +10,7 @@ as well as by 'make'.  They include:
 - Perl       <https://www.cpan.org/>
 - Tar        <https://www.gnu.org/software/tar/>
 - Texinfo    <https://www.gnu.org/software/texinfo/>
-- Wget       <http://www.gnu.org/software/wget/>
+- Wget       <https://www.gnu.org/software/wget/>
 - XZ Utils   <https://tukaani.org/xz/>
 
 It is generally better to use official packages for your system.