diff --git a/pkgs/development/python-modules/recurring-ical-events/default.nix b/pkgs/development/python-modules/recurring-ical-events/default.nix
index 6f6df628d0fb..04d83dff0966 100644
--- a/pkgs/development/python-modules/recurring-ical-events/default.nix
+++ b/pkgs/development/python-modules/recurring-ical-events/default.nix
@@ -1,9 +1,10 @@
 {
   lib,
   buildPythonPackage,
-  pythonOlder,
   fetchFromGitHub,
-  setuptools,
+  git,
+  hatch-vcs,
+  hatchling,
   icalendar,
   python-dateutil,
   tzdata,
@@ -16,20 +17,25 @@
 
 buildPythonPackage rec {
   pname = "recurring-ical-events";
-  version = "3.4.1";
-
-  disabled = pythonOlder "3.8";
-
+  version = "3.6.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "niccokunzmann";
     repo = "python-recurring-ical-events";
     tag = "v${version}";
-    hash = "sha256-JhGKowFtRJwLj/5J1lNpgMTl1d+oWsmV4wI3hfOW5io=";
+    hash = "sha256-wfp/ubFZv54z2d44hvG56xcCjGedYqW/zeNvaoPPJYE=";
   };
 
-  build-system = [ setuptools ];
+  postPatch = ''
+    substituteInPlace pyproject.toml \
+      --replace 'dynamic = ["urls", "version"]' 'version = "${version}"'
+  '';
+
+  build-system = [
+    hatch-vcs
+    hatchling
+  ];
 
   dependencies = [
     icalendar
diff --git a/pkgs/development/python-modules/x-wr-timezone/default.nix b/pkgs/development/python-modules/x-wr-timezone/default.nix
index 497ab9d2cd2a..32c7b83adef6 100644
--- a/pkgs/development/python-modules/x-wr-timezone/default.nix
+++ b/pkgs/development/python-modules/x-wr-timezone/default.nix
@@ -15,14 +15,14 @@
 
 buildPythonPackage rec {
   pname = "x-wr-timezone";
-  version = "2.0.0";
+  version = "2.0.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "niccokunzmann";
     repo = "x-wr-timezone";
     tag = "v${version}";
-    hash = "sha256-F/bNETgscbhEkpG/D1eSJaBNdpi0+xEYuNL4RURGST0=";
+    hash = "sha256-Llpe3Z0Yfd0vRgx95D4YVrnNJk0g/VqPuNvtUrUpFk0=";
   };
 
   build-system = [ setuptools ];
@@ -48,7 +48,7 @@ buildPythonPackage rec {
   pythonImportsCheck = [ "x_wr_timezone" ];
 
   meta = {
-    changelog = "https://github.com/niccokunzmann/x-wr-timezone/blob/${src.rev}/README.rst#changelog";
+    changelog = "https://github.com/niccokunzmann/x-wr-timezone/blob/${src.tag}/README.rst#changelog";
     description = "Convert calendars using X-WR-TIMEZONE to standard ones";
     homepage = "https://github.com/niccokunzmann/x-wr-timezone";
     license = lib.licenses.lgpl3Plus;