diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 2384084a7ec3..12d233ad332d 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2992,11 +2992,14 @@ let
   };
 
   pew = buildPythonPackage rec {
-    name = "pew-0.1.9";
+    name = "pew-0.1.14";
+    namePrefix = "";
+
+    disabled = isPy26 || isPy27 || isPy33; # old versions require backported libraries
 
     src = pkgs.fetchurl {
       url = "https://pypi.python.org/packages/source/p/pew/${name}.tar.gz";
-      md5 = "90a82400074b50a9e73c3045ed9ac217";
+      md5 = "0a06ab0885b39f1ef3890893942f3225";
     };
 
     propagatedBuildInputs = with self; [ virtualenv virtualenv-clone ];
@@ -3005,6 +3008,7 @@ let
       description = "Tools to manage multiple virtualenvs written in pure python, a virtualenvwrapper rewrite";
       license = licenses.mit;
       platforms = platforms.all;
+      maintainers = [ maintainers.berdario ];
     };
   };
 
@@ -10871,11 +10875,11 @@ let
   };
 
   virtualenv-clone = buildPythonPackage rec {
-    name = "virtualenv-clone-0.2.4";
+    name = "virtualenv-clone-0.2.5";
 
     src = pkgs.fetchurl {
       url = "https://pypi.python.org/packages/source/v/virtualenv-clone/${name}.tar.gz";
-      md5 = "71168b975eaaa91e65559bcc79290b3b";
+      md5 = "23e71d255058b2543d839af7f4ce3208";
     };
 
     buildInputs = with self; [pytest];