diff --git a/pkgs/games/nethack/default.nix b/pkgs/games/nethack/default.nix
index 9a60abdc1500..280ca090d60e 100644
--- a/pkgs/games/nethack/default.nix
+++ b/pkgs/games/nethack/default.nix
@@ -19,14 +19,14 @@ let
   binPath = lib.makeBinPath [ coreutils less ];
 
 in stdenv.mkDerivation rec {
-  version = "3.6.5";
+  version = "3.6.6";
   name = if x11Mode then "nethack-x11-${version}"
          else if qtMode then "nethack-qt-${version}"
          else "nethack-${version}";
 
   src = fetchurl {
-    url = "https://nethack.org/download/3.6.5/nethack-365-src.tgz";
-    sha256 = "0xifs8pqfffnmkbpmrcd1xf14yakcj06nl2bbhy4dyacg8myysmv";
+    url = "https://nethack.org/download/${version}/nethack-${lib.replaceStrings ["."] [""] version}-src.tgz";
+    sha256 = "1liyckjp34j354qnxc1zn9730lh1p2dabrg1hap24z6xnqx0rpng";
   };
 
   buildInputs = [ ncurses ]