diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f2855b..3a08826 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,39 +4,55 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.20.0](https://github.com/fabiocaccamo/django-treenode/releases/tag/0.20.0) - 2023-05-29
+-   Add `pyupgrade` (`Python >= 3.8`) to `pre-commit` config.
+-   Add `Django 4.2` support and drop `Django 2.2` support.
+-   Add `django-upgrade` (`Django >= 3.2`) to `pre-commit` hooks.
+-   Add `metadata` module.
+-   Add locales support.
+-   Add string primary key support. #81
+-   Fix XSS vulnerability in `get_display_text` method.
+-   Replace `str.format` with `f-string`.
+-   Replace `flake8` with `Ruff`.
+-   Replace `setup.py` in favor of `pyproject.toml`.
+-   Run `pre-commit` also with `tox`.
+-   Pin test requirements.
+-   Bump requirements and `pre-commit` hooks.
+-   Rename default branch from `master` to `main`.
+
 ## [0.19.0](https://github.com/fabiocaccamo/django-treenode/releases/tag/0.19.0) - 2022-12-14
--  Add `Python 3.11` and `django 4.1` support.
--  Drop `Python < 3.8` and `Django < 2.2` support. #67
--  Add `pre-commit`.
--  Bump requirements and actions.
--  Replace `str.format` with `f-strings`.
--  Replace `setup.py test` in favor of `runtests.py`.
+-   Add `Python 3.11` and `django 4.1` support.
+-   Drop `Python < 3.8` and `Django < 2.2` support. #67
+-   Add `pre-commit`.
+-   Bump requirements and actions.
+-   Replace `str.format` with `f-strings`.
+-   Replace `setup.py test` in favor of `runtests.py`.
 
 ## [0.18.2](https://github.com/fabiocaccamo/django-treenode/releases/tag/0.18.2) - 2022-07-19
--  Improved `get_breadcrumbs` performance.
+-   Improved `get_breadcrumbs` performance.
 
 ## [0.18.1](https://github.com/fabiocaccamo/django-treenode/releases/tag/0.18.1) - 2021-12-22
--  Fixed positive integer fields for big trees. #51
+-   Fixed positive integer fields for big trees. #51
 
 ## [0.18.0](https://github.com/fabiocaccamo/django-treenode/releases/tag/0.18.0) - 2021-12-08
--  Added django 4.0 compatibility.
--  Added `cascade` option to `delete` method. #40
--  Added documentation for bulk operations. #41 #42 #45
--  Removed console verbose logging. #36
--  Removed display fallback to str method due to recursion error.
--  Fixed order field too small for big trees. #44
--  Fixed tests auto-field warning.
+-   Added django 4.0 compatibility.
+-   Added `cascade` option to `delete` method. #40
+-   Added documentation for bulk operations. #41 #42 #45
+-   Removed console verbose logging. #36
+-   Removed display fallback to str method due to recursion error.
+-   Fixed order field too small for big trees. #44
+-   Fixed tests auto-field warning.
 
 ## [0.17.1](https://github.com/fabiocaccamo/django-treenode/releases/tag/0.17.1) - 2021-12-07
--  Replaced travis CI with GitHub workflow.
--  Added python 3.10 support.
--  Added feature: use `__str__` as default fallback for `treenode_display_field`.
--  Fixed backward compatibility.
+-   Replaced travis CI with GitHub workflow.
+-   Added python 3.10 support.
+-   Added feature: use `__str__` as default fallback for `treenode_display_field`.
+-   Fixed backward compatibility.
 
 ## [0.17.0](https://github.com/fabiocaccamo/django-treenode/releases/tag/0.17.0) - 2021-06-11
--  Added handling for `UUID` primary keys (thanks to @cperrin88). #31
--  Reduced admin changelist queries.
--  Added `TreeNodeModel` utility methods and properties to retrieve only pk(s):
+-   Added handling for `UUID` primary keys (thanks to @cperrin88). #31
+-   Reduced admin changelist queries.
+-   Added `TreeNodeModel` utility methods and properties to retrieve only pk(s):
     - method `get_ancestors_pks()` / property `ancestors_pks`
     - method `get_children_pks()` / property `children_pks`
     - method `get_descendants_pks()` / property `descendants_pks`
@@ -45,14 +61,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
     - method `get_siblings_pks()` / property `siblings_pks`
 
 ## [0.16.0](https://github.com/fabiocaccamo/django-treenode/releases/tag/0.16.0) - 2021-04-21
--  Added `python 3.9` and `django 3.2` to `tox` and `travis`.
--  Added `get_display_text` method. #27
--  Fixed `TreeNodeModelAdmin` duplicated query.
--  Updated `debug_performance` decorator to work only if `settings.DEBUG = True`.
+-   Added `python 3.9` and `django 3.2` to `tox` and `travis`.
+-   Added `get_display_text` method. #27
+-   Fixed `TreeNodeModelAdmin` duplicated query.
+-   Updated `debug_performance` decorator to work only if `settings.DEBUG = True`.
 
 ## [0.15.0](https://github.com/fabiocaccamo/django-treenode/releases/tag/0.15.0) - 2020-09-16
--  Added custom `cache` back-end support. #19 #24
--  Fixed tests warning (admin.W411).
+-   Added custom `cache` back-end support. #19 #24
+-   Fixed tests warning (admin.W411).
 
 ## [0.14.2](https://github.com/fabiocaccamo/django-treenode/releases/tag/0.14.2) - 2020-03-07
 ## [0.14.1](https://github.com/fabiocaccamo/django-treenode/releases/tag/0.14.1) - 2020-03-04
diff --git a/treenode/metadata.py b/treenode/metadata.py
index 64e0ef5..691a802 100644
--- a/treenode/metadata.py
+++ b/treenode/metadata.py
@@ -4,4 +4,4 @@
 __email__ = "fabio.caccamo@gmail.com"
 __license__ = "MIT"
 __title__ = "django-treenode"
-__version__ = "0.19.0"
+__version__ = "0.20.0"