diff --git a/README.md b/README.md
index f00e4a56..b72c0f1d 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 `skbase` provides base classes for creating scikit-learn-like parametric objects,
 along with tools to make it easier to build your own packages that follow these design patterns.
 
-:rocket: Version 0.8.3 is now available. Check out our
+:rocket: Version 0.9.0 is now available. Check out our
 [release notes](https://skbase.readthedocs.io/en/latest/changelog.html).
 
 | Overview | |
diff --git a/docs/source/_static/switcher.json b/docs/source/_static/switcher.json
index 6d2261c4..7c321a5b 100644
--- a/docs/source/_static/switcher.json
+++ b/docs/source/_static/switcher.json
@@ -5,7 +5,12 @@
     "url": "https://skbase.readthedocs.io/en/latest/"
   },
   {
-    "name": "0.8.3 (stable)",
+    "name": "0.9.0 (stable)",
+    "version": "stable",
+    "url": "https://skbase.readthedocs.io/en/v0.9.0/"
+  },
+  {
+    "name": "0.8.3",
     "version": "stable",
     "url": "https://skbase.readthedocs.io/en/v0.8.3/"
   },
diff --git a/docs/source/user_documentation/changelog.rst b/docs/source/user_documentation/changelog.rst
index d47cff16..886b6c2c 100644
--- a/docs/source/user_documentation/changelog.rst
+++ b/docs/source/user_documentation/changelog.rst
@@ -14,6 +14,36 @@ You can also subscribe to ``skbase``'s
 
 For planned changes and upcoming releases, see our :ref:`roadmap`.
 
+
+[0.9.0] - 2024-08-23
+====================
+
+Maintenance release with scheduled changes and deprecations.
+
+Deprecations and removals
+-------------------------
+
+* In ``all_objects``, the meaning of ``filter_tags`` arguments ot type ``str``,
+  and iterable of ``str``, has changed as scheduled.
+  Prior to 0.9.0, ``str`` or iterable of ``str`` arguments
+  selected objects that possess the
+  tag(s) with the specified name, of any value.
+  From 0.9.0 onwards, ``str`` or iterable of ``str``
+  will select objects that possess the tag with the specified name,
+  with the value ``True`` (boolean). See ``scikit-base`` issue #326 for the rationale
+  behind this change.
+  To retain previous behaviour, that is,
+  to select objects that possess the tag with the specified name, of any value,
+  use a ``dict`` with the tag name as key, and ``re.Pattern('*?')`` as value.
+  That is, ``from re import Pattern``, and pass ``{tag_name: Pattern('*?')}``
+  as ``filter_tags``, and similarly with multiple tag names.
+
+Contents
+--------
+
+* [MNT] 0.9.0 deprecations and change actions (:pr:`355`) :user:`fkiraly`
+
+
 [0.8.3] - 2024-08-23
 ====================
 
diff --git a/pyproject.toml b/pyproject.toml
index d00ccdf4..47d3beab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "scikit-base"
-version = "0.8.3"
+version = "0.9.0"
 description = "Base classes for sklearn-like parametric objects"
 authors = [
     {name = "sktime developers", email = "sktime.toolbox@gmail.com"},
diff --git a/skbase/__init__.py b/skbase/__init__.py
index 6c169a10..9d1b3c2c 100644
--- a/skbase/__init__.py
+++ b/skbase/__init__.py
@@ -6,4 +6,4 @@
 The included functionality makes it easy to reuse scikit-learn and
 sktime design principles in your project.
 """
-__version__: str = "0.8.3"
+__version__: str = "0.9.0"