diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 9e15a2f29524..45afdf766ef6 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2541,16 +2541,17 @@ pythonPackages = python.modules // rec {
 
   mrbob = buildPythonPackage rec {
     name = "mrbob-${version}";
-    version = "0.1a6";
+    version = "0.1a9";
 
     src = fetchurl {
       url = "http://pypi.python.org/packages/source/m/mr.bob/mr.bob-${version}.zip";
-      md5 = "361c8ac7a31953ab94a95cf34d9a0b2b";
+      md5 = "2d27d9bd1fc6269a3ecfd1a1ae47cd8a";
     };
 
-    buildInputs = [ pkgs.unzip six ] ++ (optionals isPy26 [ importlib ordereddict ]);
+    buildInputs = [ pkgs.unzip ];
 
-    propagatedBuildInputs = [ argparse jinja2 ];
+    propagatedBuildInputs = [ argparse jinja2 six python.modules.readline ] ++
+                            (optionals isPy26 [ importlib ordereddict ]);
 
     meta = {
       homepage = https://github.com/iElectric/mr.bob.git;