diff --git a/CHANGES.rst b/CHANGES.rst
index 5987c72..f28eb00 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,6 +4,17 @@ Changes
 Unreleased
 ----------
 
+Version 2.1.0
+-------------
+
+Released 2022-11-29
+
+- Add encode() to COSE. `#294 <https://github.com/dajiaji/python-cwt/pull/294>`__
+- Update dev dependencies.
+    - Bump pre-commit/flake8 to 6.0.0. `#288 <https://github.com/dajiaji/python-cwt/pull/288>`__
+    - Bump pre-commit/mirrors-mypy to 0.991. `#288 <https://github.com/dajiaji/python-cwt/pull/288>`__
+    - Bump pre-commit/pre-commit-hooks to 4.4.0. `#288 <https://github.com/dajiaji/python-cwt/pull/288>`__
+
 Version 2.0.0
 -------------
 
diff --git a/cwt/__init__.py b/cwt/__init__.py
index 999d9b2..5d8bf16 100644
--- a/cwt/__init__.py
+++ b/cwt/__init__.py
@@ -16,7 +16,7 @@
 from .recipient import Recipient
 from .signer import Signer
 
-__version__ = "2.0.0"
+__version__ = "2.1.0"
 __title__ = "cwt"
 __description__ = "A Python implementation of CWT/COSE"
 __url__ = "https://python-cwt.readthedocs.io"
diff --git a/pyproject.toml b/pyproject.toml
index d75bd5c..2314b3f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "cwt"
-version = "2.0.0"
+version = "2.1.0"
 description = "A Python implementation of CWT/COSE."
 authors = ["Ajitomi Daisuke <dajiaji@gmail.com>"]
 license = "MIT"