diff --git a/Changelog.md b/Changelog.md
index d43ae78..8ad24a7 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,6 +1,6 @@
 # CHANGELOG
 
-## master (unreleased)
+## v9.0.0 (2020-04-24)
 
 - **BREAKING CHANGE**: the ``IsoRegistry.items()`` method has been removed from the API. You must use the ``get_calendars()`` to perform the same registry queries (#375, #491).
 - *Deprecation notice*: The usage of ``IsoRegistry.get_calendar_class()`` is strongly discouraged, in favor of ``get()``. The ``get_calendar_class`` method will be dropped in a further release. In the meantime, they'll be both equivalent (#375, #418).
diff --git a/setup.py b/setup.py
index b36220b..ee268d9 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,7 @@ REQUIREMENTS = [
     'pyluach',
     'setuptools>=1.0',
 ]
-version = '8.5.0.dev0'
+version = '9.0.0'
 __VERSION__ = version
 
 params = dict(