diff --git a/pkgs/tools/misc/less/default.nix b/pkgs/tools/misc/less/default.nix
index 9b1aa0dc5906..4ffbf8634a8e 100644
--- a/pkgs/tools/misc/less/default.nix
+++ b/pkgs/tools/misc/less/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "less";
-  version = "551";
+  version = "563";
 
   src = fetchurl {
     url = "http://www.greenwoodsoftware.com/${pname}/${pname}-${version}.tar.gz";
-    sha256 = "0ggyjl3yzn7c450zk1rixi9ls6asdhgqynhk34zsd0ckhmsm45pz";
+    sha256 = "16lsvk88vwjwp5ax1wnll44wxwnzs8lb2fn90xx2si64kwmnsnyf";
   };
 
   configureFlags = [ "--sysconfdir=/etc" ] # Look for ‘sysless’ in /etc.