diff --git a/pkgs/development/python-modules/cccolutils/default.nix b/pkgs/development/python-modules/cccolutils/default.nix
index ee5895c411dc..569016231253 100644
--- a/pkgs/development/python-modules/cccolutils/default.nix
+++ b/pkgs/development/python-modules/cccolutils/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchPypi,
+  setuptools,
   git,
   gitpython,
   krb5-c, # C krb5 library, not PyPI krb5
@@ -9,20 +10,24 @@
   pytestCheckHook,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "cccolutils";
   version = "1.5";
-  format = "setuptools";
+  pyproject = true;
+
+  __structuredAttrs = true;
 
   src = fetchPypi {
     pname = "CCColUtils";
-    inherit version;
+    inherit (finalAttrs) version;
     hash = "sha256-YzKjG43biRbTZKtzSUHHhtzOfcZfzISHDFolqzrBjL8=";
   };
 
+  build-system = [ setuptools ];
+
   buildInputs = [ krb5-c ];
 
-  propagatedBuildInputs = [
+  dependencies = [
     git
     gitpython
     mock
@@ -37,4 +42,4 @@ buildPythonPackage rec {
     homepage = "https://pagure.io/cccolutils";
     license = lib.licenses.gpl2Plus;
   };
-}
+})