diff --git a/COPYING b/COPYING
index afbf0eb3..b9a98deb 100644
--- a/COPYING
+++ b/COPYING
@@ -21,7 +21,7 @@ versions of the program, allowing others to benefit from them.
 			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.
@@ -34,7 +34,7 @@ and other kinds of works.
 The licenses for  most software and other practical  works are designed to
 take away  your freedom to share  and change the works.   By contrast, the
 GNU General Public License is  intended to guarantee your freedom to share
-and  change all  versions  of a  program---to  make sure  it remains  free
+and  change  all  versions  of a  program--to  make sure  it remains  free
 software for all its users.  We, the Free Software Foundation, use the GNU
 General Public  License for most of  our software; it applies  also to any
 other work  released this way  by its authors.   You can apply it  to your
@@ -653,7 +653,7 @@ 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.
 
@@ -661,11 +661,11 @@ If the  program does terminal interaction,  make it output  a short notice
 like this when it starts in an interactive mode:
 
    <program>  Copyright (C) <year>,  <name of author>
-   This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+   This program comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
    This is free software, and you are welcome to redistribute it
-   under certain conditions; type `show c' for details.
+   under certain conditions; type 'show c' for details.
 
-The  hypothetical  commands  "show  w"   and  "show  c"  should  show  the
+The  hypothetical  commands  'show  w'   and  'show  c'  should  show  the
 appropriate  parts  of  the  General  Public  License.   Of  course,  your
 program's commands might be different;  for a GUI interface, you would use
 an "about box".
@@ -673,11 +673,11 @@ 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>.