diff --git a/CHANGES.rst b/CHANGES.rst
index 6932cda..f2727d0 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,18 +4,32 @@ Changes
 Unreleased
 ----------
 
+Version 1.5.5
+-------------
+
+Released 2022-06-18
+
+- Update dependencies.
+    - Bump cryptography to 37.0.2 `#228 <https://github.com/dajiaji/python-cwt/pull/228>`__.
+- Update dev dependencies.
+    - Bump sphinx to 5.0.2. `#233 <https://github.com/dajiaji/python-cwt/pull/233>`__.
+    - Bump pre-commit/mirrors-mypy to 0.961. `#232 <https://github.com/dajiaji/python-cwt/pull/232>`__.
+    - Bump pre-commit/pre-commit-hooks to 4.3.0. `#232 <https://github.com/dajiaji/python-cwt/pull/232>`__.
+    - Bump tox to 3.25.0. `#224 <https://github.com/dajiaji/python-cwt/pull/224>`__.
+
 Version 1.5.4
 -------------
 
 Released 2022-04-03
 
 - Update dependencies.
-    - Bump pre-commit from 0.930 to 0.942. `#221 <https://github.com/dajiaji/python-cwt/pull/221>`__.
-    - Bump sphinx from 4.3.2 to 4.5.0. `#220 <https://github.com/dajiaji/python-cwt/pull/220>`__.
     - Bump asn1crypto from 1.4.0 to 1.5.1. `#218 <https://github.com/dajiaji/python-cwt/pull/218>`__.
-    - Bump cryptography from 36.0.1 to 36.0. `#217 <https://github.com/dajiaji/python-cwt/pull/217>`__.
-    - Bump pytest from 6.2.5 to 7.0.1. `#213 <https://github.com/dajiaji/python-cwt/pull/213>`__.
+    - Bump cryptography from 36.0.1 to 36.0.2. `#217 <https://github.com/dajiaji/python-cwt/pull/217>`__.
     - Bump cbor2 from 5.4.2 to 5.4.2.post1. `#211 <https://github.com/dajiaji/python-cwt/pull/211>`__.
+- Update dev dependencies.
+    - Bump pre-commit/mirrors-mypy from 0.930 to 0.942. `#221 <https://github.com/dajiaji/python-cwt/pull/221>`__.
+    - Bump sphinx from 4.3.2 to 4.5.0. `#220 <https://github.com/dajiaji/python-cwt/pull/220>`__.
+    - Bump pytest from 6.2.5 to 7.0.1. `#213 <https://github.com/dajiaji/python-cwt/pull/213>`__.
 - Add pre-commit hooks for checking json, toml and yaml files. `#207 <https://github.com/dajiaji/python-cwt/pull/208>`__
 - Migrate mypy to pre-commit. `#206 <https://github.com/dajiaji/python-cwt/pull/206>`__
 
diff --git a/cwt/__init__.py b/cwt/__init__.py
index d4dd95c..67dbf2b 100644
--- a/cwt/__init__.py
+++ b/cwt/__init__.py
@@ -16,7 +16,7 @@
 from .recipient import Recipient
 from .signer import Signer
 
-__version__ = "1.5.4"
+__version__ = "1.5.5"
 __title__ = "cwt"
 __description__ = "A Python implementation of CWT/COSE"
 __url__ = "https://python-cwt.readthedocs.io"
diff --git a/pyproject.toml b/pyproject.toml
index d1bd6e6..d1b5135 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "cwt"
-version = "1.5.4"
+version = "1.5.5"
 description = "A Python implementation of CWT/COSE."
 authors = ["Ajitomi Daisuke <dajiaji@gmail.com>"]
 license = "MIT"