diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 51d9647b929..3d21281c598 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5394,21 +5394,57 @@ in {
     };
   };
 
+  heapdict = buildPythonPackage rec {
+    name = "HeapDict-${version}";
+    version = "1.0.0";
+
+    src = pkgs.fetchurl {
+      url = "mirror://pypi/H/HeapDict/${name}.tar.gz";
+      sha256 = "0nhvxyjq6fp6zd7jzmk5x4fg6xhakqx9lhkp5yadzkqn0rlf7ja0";
+    };
+    doCheck = !isPy3k;
+    meta = {
+      description = "a heap with decrease-key and increase-key operations.";
+      homepage = http://stutzbachenterprises.com;
+      license = licenses.bsd3;
+      maintainers = with maintainers; [ teh ];
+    };
+  };
+
+  zict = buildPythonPackage rec {
+
+    name = "zict-${version}";
+    version = "0.0.3";
+
+    src = pkgs.fetchurl {
+      url = "mirror://pypi/z/zict/${name}.tar.gz";
+      sha256 = "1xsrlzrih0qmxvxqhk2c5vhzxirf509fppzdfyardl50jpsllni6";
+    };
+
+    propagatedBuildInputs = with self; [ heapdict ];
+
+    meta = {
+      description = "Mutable mapping tools.";
+      homepage = https://github.com/dask/zict;
+      license = licenses.bsd3;
+      maintainers = with maintainers; [ teh ];
+    };
+  };
 
   distributed = buildPythonPackage rec {
 
     name = "distributed-${version}";
-    version = "1.10.0";
+    version = "1.13.3";
 
     src = pkgs.fetchurl {
       url = "mirror://pypi/d/distributed/${name}.tar.gz";
-      sha256 = "11bp2rs52fhcqlgyrlh3cf31ck07mys38mrkf98vjl380lyjj357";
+      sha256 = "0nka6hqz986j1fhvfmxffgvmnxh66giq9a3ml58jsaf0riq9mjrc";
     };
 
     buildInputs = with self; [ pytest docutils ];
     propagatedBuildInputs = with self; [
       dask six boto3 s3fs tblib locket msgpack click cloudpickle tornado
-      psutil botocore
+      psutil botocore zict lz4
     ] ++ (if !isPy3k then [ singledispatch ] else []);
 
     # py.test not picking up local config file, even when running