diff --git a/pkgs/development/python-modules/icalendar/default.nix b/pkgs/development/python-modules/icalendar/default.nix
index 28b5d1b81abb..e848cb79cf48 100644
--- a/pkgs/development/python-modules/icalendar/default.nix
+++ b/pkgs/development/python-modules/icalendar/default.nix
@@ -2,6 +2,7 @@
 , buildPythonPackage
 , fetchFromGitHub
 , pythonOlder
+, setuptools
 , backports-zoneinfo
 , python-dateutil
 , pytz
@@ -10,18 +11,22 @@
 }:
 
 buildPythonPackage rec {
-  version = "5.0.10";
+  version = "5.0.12";
   pname = "icalendar";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "collective";
     repo = "icalendar";
     rev = "refs/tags/v${version}";
-    hash = "sha256-sRsUjNClJ58kmCRiwSe7oq20eamj95Vwy/o0xPU8qPw=";
+    hash = "sha256-313NcknY2zad4lI+/P0szDVjEQ8VatnSiBiaG/Ta1Bw=";
   };
 
-  propagatedBuildInputs = [
+  build-system = [
+    setuptools
+  ];
+
+  dependencies = [
     python-dateutil
     pytz
   ] ++ lib.optionals (pythonOlder "3.9") [