diff --git a/poetry.lock b/poetry.lock
index af1e6c1..7b5299b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -2,7 +2,7 @@
 name = "bcrypt"
 version = "3.2.0"
 description = "Modern password hashing for your software and your servers"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -18,7 +18,7 @@ typecheck = ["mypy"]
 name = "certifi"
 version = "2020.12.5"
 description = "Python package for providing Mozilla's CA Bundle."
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -26,7 +26,7 @@ python-versions = "*"
 name = "cffi"
 version = "1.14.5"
 description = "Foreign Function Interface for Python calling C code."
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -37,7 +37,7 @@ pycparser = "*"
 name = "chardet"
 version = "4.0.0"
 description = "Universal encoding detector for Python 2 and 3"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -45,7 +45,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 name = "cryptography"
 version = "3.4.6"
 description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -64,7 +64,7 @@ test = ["pytest (>=6.0)", "pytest-cov", "pytest-subtests", "pytest-xdist", "pret
 name = "defusedxml"
 version = "0.7.1"
 description = "XML bomb protection for Python stdlib modules"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -72,7 +72,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 name = "elementpath"
 version = "2.2.0"
 description = "XPath 1.0/2.0 parsers and selectors for ElementTree and lxml"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -83,7 +83,7 @@ dev = ["tox", "coverage", "lxml", "xmlschema (>=1.2.3,<1.3.0)", "sphinx"]
 name = "gevent"
 version = "21.1.2"
 description = "Coroutine-based network library"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
 
@@ -104,7 +104,7 @@ test = ["dnspython (>=1.16.0,<2.0)", "idna", "requests", "objgraph", "cffi (>=1.
 name = "gevent-websocket"
 version = "0.10.1"
 description = "Websocket handler for the gevent pywsgi server, a Python network library"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -115,7 +115,7 @@ gevent = "*"
 name = "greenlet"
 version = "1.0.0"
 description = "Lightweight in-process concurrent programming"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
 
@@ -126,7 +126,7 @@ docs = ["sphinx"]
 name = "http-ece"
 version = "1.1.0"
 description = "Encrypted Content Encoding for HTTP"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -137,7 +137,7 @@ cryptography = ">=2.5"
 name = "idna"
 version = "2.10"
 description = "Internationalized Domain Names in Applications (IDNA)"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
@@ -145,7 +145,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 name = "importlib-metadata"
 version = "3.7.2"
 description = "Read metadata from Python packages"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -161,7 +161,7 @@ testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake
 name = "importlib-resources"
 version = "5.1.2"
 description = "Read resources from Python packages"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -176,7 +176,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pyt
 name = "jinja-markdown"
 version = "1.200630"
 description = "A jinja2 markdown tag powered with PyMdown Extensions."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6,<4.0"
 
@@ -193,7 +193,7 @@ testing = ["pytest"]
 name = "jinja2"
 version = "2.11.3"
 description = "A very fast and expressive template engine."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -207,7 +207,7 @@ i18n = ["Babel (>=0.8)"]
 name = "markdown"
 version = "3.3.4"
 description = "Python implementation of Markdown."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -221,15 +221,15 @@ testing = ["coverage", "pyyaml"]
 name = "markupsafe"
 version = "1.1.1"
 description = "Safely add untrusted strings to HTML/XML markup."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 
 [[package]]
 name = "mitama"
-version = "4.5.20"
+version = "4.5.21"
 description = ""
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6,<4.0"
 
@@ -255,7 +255,7 @@ watchdog = ">=2.0.1,<3.0.0"
 name = "pillow"
 version = "8.1.2"
 description = "Python Imaging Library (Fork)"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -263,7 +263,7 @@ python-versions = ">=3.6"
 name = "py-vapid"
 version = "1.7.1"
 description = "Simple VAPID header generation library"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -274,7 +274,7 @@ cryptography = ">=2.5"
 name = "pycparser"
 version = "2.20"
 description = "C parser in Python"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
@@ -282,7 +282,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 name = "pycryptodome"
 version = "3.10.1"
 description = "Cryptographic library for Python"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -290,7 +290,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 name = "pygments"
 version = "2.6.1"
 description = "Pygments is a syntax highlighting package written in Python."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.5"
 
@@ -298,7 +298,7 @@ python-versions = ">=3.5"
 name = "pyjwt"
 version = "2.0.1"
 description = "JSON Web Token implementation in Python"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -312,7 +312,7 @@ tests = ["pytest (>=6.0.0,<7.0.0)", "coverage[toml] (==5.0.4)"]
 name = "pymdown-extensions"
 version = "7.1"
 description = "Extension pack for Python Markdown."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
 
@@ -323,7 +323,7 @@ Markdown = ">=3.2"
 name = "pyopenssl"
 version = "20.0.1"
 description = "Python wrapper module around the OpenSSL library"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
 
@@ -339,7 +339,7 @@ test = ["flaky", "pretend", "pytest (>=3.0.1)"]
 name = "pysaml2"
 version = "6.5.1"
 description = "Python implementation of SAML Version 2 Standard"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "<4,>=3.6"
 
@@ -361,7 +361,7 @@ s2repoze = ["paste", "zope.interface", "repoze.who"]
 name = "python-dateutil"
 version = "2.8.1"
 description = "Extensions to the standard Python datetime module"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
 
@@ -372,7 +372,7 @@ six = ">=1.5"
 name = "python-magic"
 version = "0.4.22"
 description = "File type identification using libmagic"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -380,7 +380,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 name = "pytz"
 version = "2021.1"
 description = "World timezone definitions, modern and historical"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -388,7 +388,7 @@ python-versions = "*"
 name = "pywebpush"
 version = "1.11.0"
 description = "WebPush publication library"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -402,7 +402,7 @@ requests = ">=2.21.0"
 name = "requests"
 version = "2.25.1"
 description = "Python HTTP for Humans."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -420,7 +420,7 @@ socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
 name = "six"
 version = "1.15.0"
 description = "Python 2 and 3 compatibility utilities"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 
@@ -428,7 +428,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 name = "sqlalchemy"
 version = "1.3.23"
 description = "Database Abstraction Library"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
@@ -448,7 +448,7 @@ pymysql = ["pymysql (<1)", "pymysql"]
 name = "typing-extensions"
 version = "3.7.4.3"
 description = "Backported and Experimental Type Hints for Python 3.5+"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -456,7 +456,7 @@ python-versions = "*"
 name = "tzlocal"
 version = "2.1"
 description = "tzinfo object for the local timezone"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -475,7 +475,7 @@ python-versions = "*"
 name = "urllib3"
 version = "1.26.3"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
@@ -488,7 +488,7 @@ socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 name = "uwsgi"
 version = "2.0.19.1"
 description = "The uWSGI server"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -496,7 +496,7 @@ python-versions = "*"
 name = "watchdog"
 version = "2.0.2"
 description = "Filesystem events monitoring"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -507,7 +507,7 @@ watchmedo = ["PyYAML (>=3.10)", "argh (>=0.24.1)"]
 name = "xmlschema"
 version = "1.5.2"
 description = "An XML Schema validator and decoder"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -523,7 +523,7 @@ docs = ["elementpath (>=2.1.2,<3.0.0)", "sphinx", "sphinx-rtd-theme", "jinja2"]
 name = "zipp"
 version = "3.4.1"
 description = "Backport of pathlib-compatible object wrapper for zip files"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -535,7 +535,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pyt
 name = "zope.event"
 version = "4.5.0"
 description = "Very basic event publishing system"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -547,7 +547,7 @@ test = ["zope.testrunner"]
 name = "zope.interface"
 version = "5.2.0"
 description = "Interfaces for Python"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -559,7 +559,7 @@ testing = ["coverage (>=5.0.3)", "zope.event", "zope.testing"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6"
-content-hash = "ee755ed6cdddb37be43871d04776174db59421898346168e09f2bd47851525d0"
+content-hash = "11483f60bc8649dae0e9175c3045697e7b17fb708a2812c6e5c6ec1aad6ab97f"
 
 [metadata.files]
 bcrypt = [
@@ -796,7 +796,7 @@ markupsafe = [
     {file = "MarkupSafe-1.1.1.tar.gz", hash = "sha256:29872e92839765e546828bb7754a68c418d927cd064fd4708fab9fe9c8bb116b"},
 ]
 mitama = [
-    {file = "mitama-4.5.20-py3-none-any.whl", hash = "sha256:297e74e7fe7daf747b69fc8bae6962f13e518effd086cdbf1319bc2735ff00f3"},
+    {file = "mitama-4.5.21-py3-none-any.whl", hash = "sha256:ed99452526d756e14574f1bbe67d15fd88f013bf2ac3a61a2ce3fd63781e525e"},
 ]
 pillow = [
     {file = "Pillow-8.1.2-cp36-cp36m-macosx_10_10_x86_64.whl", hash = "sha256:5cf03b9534aca63b192856aa601c68d0764810857786ea5da652581f3a44c2b0"},
diff --git a/pyproject.toml b/pyproject.toml
index eec60c2..b6d7843 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,10 +14,10 @@ include = [
 
 [tool.poetry.dependencies]
 python = "^3.6"
-mitama = "^4.5.20"
 
 [tool.poetry.dev-dependencies]
 unittest = "^0.0"
+mitama = "^4.5.20"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]