3 files changed, 18 insertions, 5 deletions
diff --git a/pkgs/development/python-modules/tornado/default.nix b/pkgs/development/python-modules/tornado/default.nix
index 6d86404e1925..d446d377e66f 100644
--- a/pkgs/development/python-modules/tornado/default.nix
+++ b/pkgs/development/python-modules/tornado/default.nix
@@ -8,12 +8,25 @@
 , singledispatch
 , pythonOlder
 , futures
+, version ? "5.1"
 }:
 
+let
+  versionMap = {
+    "4.5.3" = {
+      sha256 = "02jzd23l4r6fswmwxaica9ldlyc2p6q8dk6dyff7j58fmdzf853d";
+    };
+    "5.1" = {
+      sha256 = "4f66a2172cb947387193ca4c2c3e19131f1c70fa8be470ddbbd9317fd0801582";
+    };
+  };
+in
+
+with versionMap.${version};
+
 buildPythonPackage rec {
   pname = "tornado";
-  version = "5.1";
-
+  inherit version;
 
   propagatedBuildInputs = [ backports_abc  certifi singledispatch ]
     ++ lib.optional (pythonOlder "3.5") backports_ssl_match_hostname
@@ -26,8 +39,7 @@ buildPythonPackage rec {
   '';
 
   src = fetchPypi {
-    inherit pname version;
-    sha256 = "4f66a2172cb947387193ca4c2c3e19131f1c70fa8be470ddbbd9317fd0801582";
+    inherit pname sha256 version;
   };
 
   meta = {
diff --git a/pkgs/tools/admin/salt/default.nix b/pkgs/tools/admin/salt/default.nix
index 80df9148220c..6cf997cd738c 100644
--- a/pkgs/tools/admin/salt/default.nix
+++ b/pkgs/tools/admin/salt/default.nix
@@ -23,7 +23,7 @@ pythonPackages.buildPythonApplication rec {
     pyyaml
     pyzmq
     requests
-    tornado
+    tornado_4
   ] ++ stdenv.lib.optional (!pythonPackages.isPy3k) [
     futures
   ] ++ extraInputs;
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 4375ab550fde..c4e46ea8889a 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -14901,6 +14901,7 @@ EOF
   };
 
   tornado = callPackage ../development/python-modules/tornado { };
+  tornado_4 = callPackage ../development/python-modules/tornado { version = "4.5.3"; };
 
   tokenlib = buildPythonPackage rec {
     name = "tokenlib-${version}";