diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8ada647..3170c0f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,17 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](https://semver.org/)
 
+## [6.3.0] 2024-05-22
+
+### Changed
+
+- update ruff
+
+### Fixed
+
+- exampe test
+
+
 ## [6.2.0] 2024-05-06
 
 ### Added
@@ -14,7 +25,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 - coverage report does some advanced exclusion:
   - https://coverage.readthedocs.io/en/7.5.0/excluding.html#advanced-exclusion
-- update dependencies
+- update dependencies, esp. ruff
 
 ### Security
 
diff --git a/src/cmem_plugin_{{ project_slug }}/example_transform.py b/src/cmem_plugin_{{ project_slug }}/example_transform.py
index e561948..a4d2923 100644
--- a/src/cmem_plugin_{{ project_slug }}/example_transform.py	
+++ b/src/cmem_plugin_{{ project_slug }}/example_transform.py	
@@ -1,4 +1,5 @@
 """lifetime(age) transform plugin module"""
+
 import datetime
 from collections.abc import Sequence
 from datetime import date
diff --git a/src/cmem_plugin_{{ project_slug }}/example_workflow.py b/src/cmem_plugin_{{ project_slug }}/example_workflow.py
index 31d4058..228adf7 100644
--- a/src/cmem_plugin_{{ project_slug }}/example_workflow.py	
+++ b/src/cmem_plugin_{{ project_slug }}/example_workflow.py	
@@ -1,4 +1,5 @@
 """Random values workflow plugin module"""
+
 import uuid
 from collections.abc import Sequence
 from secrets import token_urlsafe
diff --git a/src/pyproject.toml.jinja b/src/pyproject.toml.jinja
index 3acaa16..fc8f107 100644
--- a/src/pyproject.toml.jinja
+++ b/src/pyproject.toml.jinja
@@ -32,7 +32,7 @@ pytest-cov = "^4.1.0"
 pytest-dotenv = "^0.5.2"
 pytest-html = "^4.1.1"
 pytest-memray = { version = "^1.6.0",  markers = "platform_system != 'Windows'" }
-ruff = "^0.1.15"
+ruff = "^0.4.4"
 safety = "^1.10.3"
 
 [build-system]
diff --git a/src/tests/test_example.py.jinja b/src/tests/test_example.py.jinja
index 008cfbf..cb7d2b5 100644
--- a/src/tests/test_example.py.jinja
+++ b/src/tests/test_example.py.jinja
@@ -1,4 +1,5 @@
 """Plugin tests."""
+
 import io
 
 import pytest
@@ -60,7 +61,7 @@ def test_transform_execution_with_optional_input() -> None:
     """Test Lifetime with optional input"""
     result = Lifetime(start_date="2000-05-22").transform(inputs=[])
     for item in result:
-        assert item == "23"
+        assert item == "24"
 
 
 def test_transform_execution_with_inputs() -> None:
diff --git a/src/tests/utils.py b/src/tests/utils.py
index 438fc63..f389888 100644
--- a/src/tests/utils.py
+++ b/src/tests/utils.py
@@ -1,4 +1,5 @@
 """Testing utilities."""
+
 import os
 from typing import ClassVar