diff --git a/pkgs/development/python-modules/demjson3/default.nix b/pkgs/development/python-modules/demjson3/default.nix
index 03d4373143f2..50668ec38834 100644
--- a/pkgs/development/python-modules/demjson3/default.nix
+++ b/pkgs/development/python-modules/demjson3/default.nix
@@ -1,26 +1,29 @@
 { lib
-, python
 , buildPythonPackage
 , fetchPypi
 , pythonOlder
+, python
 }:
 
 buildPythonPackage rec {
   pname = "demjson3";
   version = "3.0.6";
+  format = "setuptools";
 
-  disabled = pythonOlder "3.6";
+  disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-N8g7DG6wjSXe/IjfCipIddWKeAmpZQvW7uev2AU826w=";
+    hash = "sha256-N8g7DG6wjSXe/IjfCipIddWKeAmpZQvW7uev2AU826w=";
   };
 
   checkPhase = ''
     ${python.interpreter} test/test_demjson3.py
   '';
 
-  pythonImportsCheck = [ "demjson3" ];
+  pythonImportsCheck = [
+    "demjson3"
+  ];
 
   meta = with lib; {
     description = "Encoder/decoder and lint/validator for JSON (JavaScript Object Notation)";