diff --git a/pkgs/development/tools/glslviewer/default.nix b/pkgs/development/tools/glslviewer/default.nix
index b9e46ca41e176..84b3d2a6b1ee0 100644
--- a/pkgs/development/tools/glslviewer/default.nix
+++ b/pkgs/development/tools/glslviewer/default.nix
@@ -1,28 +1,28 @@
 { stdenv, fetchFromGitHub, glfw, pkgconfig, libXrandr, libXdamage
 , libXext, libXrender, libXinerama, libXcursor, libXxf86vm, libXi
-, libX11, libGLU, python2Packages, ensureNewerSourcesForZipFilesHook
+, libX11, libGLU, python3Packages, ensureNewerSourcesForZipFilesHook
 , Cocoa
 }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "glslviewer";
-  version = "2019-04-22";
+  version = "1.6.8";
 
   src = fetchFromGitHub {
     owner = "patriciogonzalezvivo";
     repo = "glslViewer";
-    rev = "fa3e2ed4810927d189e480b704366cca22f281f3";
-    sha256 = "1888jxi84f2nnc0kpzqrn2cada1z4zqyq8ss4ppb5y3wy7d87qjn";
+    rev = version;
+    sha256 = "0v7x93b61ama0gmzlx1zc56jgi7bvzsfvbkfl82xzwf2h5g1zni7";
   };
 
-  nativeBuildInputs = [ pkgconfig ensureNewerSourcesForZipFilesHook ];
+  nativeBuildInputs = [ pkgconfig ensureNewerSourcesForZipFilesHook python3Packages.six ];
   buildInputs = [
     glfw libGLU glfw libXrandr libXdamage
     libXext libXrender libXinerama libXcursor libXxf86vm
     libXi libX11
-  ] ++ (with python2Packages; [ python setuptools wrapPython ])
+  ] ++ (with python3Packages; [ python setuptools wrapPython ])
     ++ stdenv.lib.optional stdenv.isDarwin Cocoa;
-  pythonPath = with python2Packages; [ requests ];
+  pythonPath = with python3Packages; [ pyyaml requests ];
 
   # Makefile has /usr/local/bin hard-coded for 'make install'
   preConfigure = ''
@@ -31,6 +31,7 @@ stdenv.mkDerivation {
         --replace '/usr/bin/clang++' 'clang++'
     substituteInPlace Makefile \
         --replace 'python setup.py install' "python setup.py install --prefix=$out"
+    2to3 -w bin/*
   '';
 
   preInstall = ''