diff --git a/CHANGES.rst b/CHANGES.rst
index 2016cca9..e5617e02 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,6 +4,28 @@ Changes
 Unreleased
 ----------
 
+Version 2.7.0
+-------------
+
+Released 2023-10-20
+
+- Fix to_cis to convert protected from Dict[str, Any] to Dict[int, Any]. `#452 <https://github.com/dajiaji/python-cwt/pull/452>`__
+- Add detached_payload parameter to sign/verify funcs. `#451 <https://github.com/dajiaji/python-cwt/pull/451>`__
+- Fix detach&attach not to create new COSEMessage instance. `#447 <https://github.com/dajiaji/python-cwt/pull/447>`__
+- Remove Self from COSEMessage. `#446 <https://github.com/dajiaji/python-cwt/pull/446>`__
+- Update test for COSE-HPKE. `#445 <https://github.com/dajiaji/python-cwt/pull/445>`__
+- Add detached content converter. `#444 <https://github.com/dajiaji/python-cwt/pull/444>`__
+- Add ECDH-ES+AES-KW test. `#443 <https://github.com/dajiaji/python-cwt/pull/443>`__
+- Parametrize test for AES-KW/HPKE and CTR/CBC. `#442 <https://github.com/dajiaji/python-cwt/pull/442>`__
+- Add AES-CTR and AES-CBC support. `#441 <https://github.com/dajiaji/python-cwt/pull/441>`__
+- Allow AES-KW algorithm in context. `#439 <https://github.com/dajiaji/python-cwt/pull/439>`__
+- Update dev dependencies.
+    - Bump urllib3 to 2.0.6. `#450 <https://github.com/dajiaji/python-cwt/pull/450>`__
+    - Bump pre-commit/mirrors-mypy to 1.5.1. `#449 <https://github.com/dajiaji/python-cwt/pull/449>`__
+    - Bump pre-commit to 3.5.0. `#448 <https://github.com/dajiaji/python-cwt/pull/448>`__
+    - Bump pre-commit/black to 23.9.1. `#438 <https://github.com/dajiaji/python-cwt/pull/438>`__
+    - Bump pre-commit/pre-commit-hooks to 4.5.0. `#438 <https://github.com/dajiaji/python-cwt/pull/438>`__
+
 Version 2.6.0
 -------------
 
@@ -16,6 +38,7 @@ Released 2023-10-09
 - Fix typo of private attribute. `#435 <https://github.com/dajiaji/python-cwt/pull/435>`__
 - Update dev dependencies.
     - Bump urllib3 to 2.0.6. `#436 <https://github.com/dajiaji/python-cwt/pull/436>`__
+    - Bump pre-commit/mirrors-mypy to 1.5.1. `#434 <https://github.com/dajiaji/python-cwt/pull/434>`__
 
 Version 2.5.1
 -------------
diff --git a/SECURITY.md b/SECURITY.md
index 7203fe4b..3a22a82c 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -4,8 +4,8 @@
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 2.6.x   | :white_check_mark: |
-| < 2.6  | :x:                |
+| 2.7.x   | :white_check_mark: |
+| < 2.7  | :x:                |
 
 ## Reporting a Vulnerability
 
diff --git a/cwt/__init__.py b/cwt/__init__.py
index edddb03f..4b0c8e19 100644
--- a/cwt/__init__.py
+++ b/cwt/__init__.py
@@ -27,7 +27,7 @@
 from .recipient import Recipient
 from .signer import Signer
 
-__version__ = "2.6.0"
+__version__ = "2.7.0"
 __title__ = "cwt"
 __description__ = "A Python implementation of CWT/COSE"
 __url__ = "https://python-cwt.readthedocs.io"
diff --git a/pyproject.toml b/pyproject.toml
index 5963e8b7..fa802abe 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "cwt"
-version = "2.6.0"
+version = "2.7.0"
 description = "A Python implementation of CWT/COSE."
 authors = ["Ajitomi Daisuke <dajiaji@gmail.com>"]
 license = "MIT"