diff --git a/pkgs/development/python-modules/unidiff/default.nix b/pkgs/development/python-modules/unidiff/default.nix
index f7586231e2dc..f3babe48eb5c 100644
--- a/pkgs/development/python-modules/unidiff/default.nix
+++ b/pkgs/development/python-modules/unidiff/default.nix
@@ -3,18 +3,21 @@
   buildPythonPackage,
   fetchPypi,
   unittestCheckHook,
+  setuptools,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "unidiff";
   version = "0.7.5";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchPypi {
-    inherit pname version;
+    inherit (finalAttrs) pname version;
     sha256 = "2e5f0162052248946b9f0970a40e9e124236bf86c82b70821143a6fc1dea2574";
   };
 
+  build-system = [ setuptools ];
+
   nativeCheckInputs = [ unittestCheckHook ];
 
   unittestFlagsArray = [
@@ -28,8 +31,8 @@ buildPythonPackage rec {
     description = "Unified diff python parsing/metadata extraction library";
     mainProgram = "unidiff";
     homepage = "https://github.com/matiasb/python-unidiff";
-    changelog = "https://github.com/matiasb/python-unidiff/raw/v${version}/HISTORY";
+    changelog = "https://github.com/matiasb/python-unidiff/raw/v${finalAttrs.version}/HISTORY";
     license = lib.licenses.mit;
     maintainers = [ lib.maintainers.pbsds ];
   };
-}
+})