diff --git a/pkgs/development/python-modules/morfessor/default.nix b/pkgs/development/python-modules/morfessor/default.nix
index 969e2f347a99..0fda02a714f4 100644
--- a/pkgs/development/python-modules/morfessor/default.nix
+++ b/pkgs/development/python-modules/morfessor/default.nix
@@ -2,13 +2,14 @@
   lib,
   buildPythonPackage,
   fetchPypi,
+  setuptools_80,
+  pytestCheckHook,
 }:
 
 buildPythonPackage rec {
   pname = "morfessor";
   version = "2.0.6";
-
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchPypi {
     pname = "Morfessor";
@@ -16,7 +17,13 @@ buildPythonPackage rec {
     sha256 = "bb3beac234341724c5f640f65803071f62373a50dba854d5a398567f9aefbab2";
   };
 
-  checkPhase = "python -m unittest -v morfessor/test/*";
+  build-system = [ setuptools_80 ];
+
+  nativeCheckInputs = [ pytestCheckHook ];
+
+  enabledTestPaths = [
+    "morfessor/test/*"
+  ];
 
   pythonImportsCheck = [ "morfessor" ];