diff --git a/pkgs/development/python-modules/millheater/default.nix b/pkgs/development/python-modules/millheater/default.nix
index 0ff22033f644..3968e8bf8088 100644
--- a/pkgs/development/python-modules/millheater/default.nix
+++ b/pkgs/development/python-modules/millheater/default.nix
@@ -9,14 +9,16 @@
 
 buildPythonPackage rec {
   pname = "millheater";
-  version = "0.8.1";
+  version = "0.9.0";
+  format = "setuptools";
+
   disabled = pythonOlder "3.6";
 
   src = fetchFromGitHub {
     owner = "Danielhiversen";
     repo = "pymill";
     rev = version;
-    sha256 = "0269lhb6y4c13n6krsl2b66ldvzkd26jlax7bbnkvag2iv7g6hzj";
+    sha256 = "sha256-ocPp9tRghlOb0vZrpELDkwOq8ue+JBCRf2uB0Q7CPF8=";
   };
 
   propagatedBuildInputs = [