diff --git a/pkgs/development/python-modules/pyprof2calltree/default.nix b/pkgs/development/python-modules/pyprof2calltree/default.nix
index db979ae4297e..deab3b909290 100644
--- a/pkgs/development/python-modules/pyprof2calltree/default.nix
+++ b/pkgs/development/python-modules/pyprof2calltree/default.nix
@@ -1,19 +1,27 @@
-{ lib, buildPythonPackage, fetchFromGitHub }:
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, setuptools
+}:
 
 buildPythonPackage rec {
   pname = "pyprof2calltree";
   version = "1.4.5";
-  format = "setuptools";
+  pyproject = true;
 
   # Fetch from GitHub because the PyPi packaged version does not
   # include all test files.
   src = fetchFromGitHub {
     owner = "pwaller";
     repo = "pyprof2calltree";
-    rev = "v" + version;
-    sha256 = "0akighssiswfhi5285rrj37am6flg3ip17c34bayq3r8yyk1iciy";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-PrIYpvcoD+zVIoOdcON41JmqzpA5FyRKhI7rqDV8cSo=";
   };
 
+  build-system = [
+    setuptools
+  ];
+
   meta = with lib; {
     description = "Help visualize profiling data from cProfile with kcachegrind and qcachegrind";
     mainProgram = "pyprof2calltree";