diff --git a/README.md b/README.md
index bdd714fb..34002727 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 0.13.2 is now available. Check out our
+:rocket: Version 1.0.0 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 e5ff249b..5c8a0420 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": "0.13.2 (stable)",
+    "name": "1.0.0 (stable)",
+    "version": "stable",
+    "url": "https://skbase.readthedocs.io/en/v1.0.0/"
+  },
+  {
+    "name": "0.13.2",
     "version": "stable",
     "url": "https://skbase.readthedocs.io/en/v0.13.2/"
   },
diff --git a/docs/source/user_documentation/changelog.rst b/docs/source/user_documentation/changelog.rst
index e3b9e5d0..3d23e237 100644
--- a/docs/source/user_documentation/changelog.rst
+++ b/docs/source/user_documentation/changelog.rst
@@ -14,6 +14,58 @@ You can also subscribe to ``skbase``'s
 
 For planned changes and upcoming releases, see our :ref:`roadmap`.
 
+[1.0.0] - 2026-04-19
+====================
+
+Increment version to 1.0.0 to mark long-term API stable releases of ``skbase``.
+
+Minor feature release.
+
+Tag inheritance resolution have changed to encompass diamond inheritance
+and mixed base class situations, see below for details.
+
+Core interface changes
+----------------------
+
+Tag inheritance resolution in ``get_tags`` and ``get_class_tags`` now uses all parent
+classes in MRO, and resolves diamond inheritance the same way as Python proper.
+
+``scikit-base`` no longer expects ``BaseObject`` to be the top level base class for
+all objects in the ecosystem, allowing mixin and other base classes to be used without
+API non-compliance.
+
+Enhancements
+------------
+
+* [ENH] change ``_MetaObjectMixin._check_objects`` default
+  for ``attr_name`` to auto-detect (:pr:`466`) :user:`SimonBlanke`
+* [ENH] change tag resolution in ``_get_class_flags`` to use all parent classes in MRO,
+  and check for tag in class dict
+  instead of using ``getattr`` (:pr:`540`) :user:`vedant21-oss`
+
+Fixes
+-----
+
+* [BUG] normalize package names in ``_check_soft_dependencies``
+  following PEP 503 (:pr:`544`) :user:`fkiraly`
+* [BUG] Fix incorrect tag resolution in ``_get_class_flags`` with diamond inheritance
+  (:pr:`511`) :user:`WHOIM1205`
+
+Maintenance
+-----------
+
+* [MNT] downwards compatibility testing for ``deep_equals``
+  (:pr:`537`) :user:`sid200727`
+
+Contributors
+------------
+
+:user:`fkiraly`,
+:user:`sid200727`,
+:user:`SimonBlanke`,
+:user:`WHOIM1205`,
+:user:`vedant21-oss`
+
 [0.13.2] - 2026-04-12
 =====================
 
diff --git a/pyproject.toml b/pyproject.toml
index ebfff208..5b8c2780 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "scikit-base"
-version = "0.13.2"
+version = "1.0.0"
 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 e895e766..0e07b7b5 100644
--- a/skbase/__init__.py
+++ b/skbase/__init__.py
@@ -7,4 +7,4 @@
 sktime design principles in your project.
 """
 
-__version__: str = "0.13.2"
+__version__: str = "1.0.0"