diff --git a/poetry.lock b/poetry.lock
index 1a3c521..2d29219 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -779,7 +779,7 @@ description = "The strictest and most opinionated python linter ever"
 name = "wemake-python-styleguide"
 optional = false
 python-versions = ">=3.6,<4.0"
-version = "0.9.0"
+version = "0.9.1"
 
 [package.dependencies]
 astor = ">=0.7.1,<0.9.0"
@@ -803,6 +803,7 @@ flake8-print = ">=3.1,<4.0"
 flake8-quotes = ">=1,<3"
 flake8-string-format = ">=0.2,<0.3"
 pep8-naming = ">=0.7,<0.9"
+pydocstyle = "<4"
 typing_extensions = ">=3.6,<4.0"
 
 [[package]]
@@ -893,5 +894,5 @@ typing-extensions = ["07b2c978670896022a43c4b915df8958bec4a6b84add7f2c87b2b728bd
 urllib3 = ["4c291ca23bbb55c76518905869ef34bdd5f0e46af7afe6861e8375643ffee1a0", "9a247273df709c4fedb38c711e44292304f73f39ab01beda9f6b9fc375669ac3"]
 validators = ["ea9bf8bf22aa692c205e12830d90b3b93950e5122d22bed9eb2f2fece0bba298"]
 wcwidth = ["3df37372226d6e63e1b1e1eda15c594bca98a22d33a23832a90998faa96bc65e", "f4ebe71925af7b40a864553f761ed559b43544f8f71746c2d756c7fe788ade7c"]
-wemake-python-styleguide = ["6c9920a9894b03778e157afac871f2088a91f79c9d57d9e90bc98ad2cfd0e0b0", "e2ae8e5c54bc50889088dc71c6ad60960f540bd45b8c8318db7a50c1c22d695e"]
+wemake-python-styleguide = ["042503a2c656a58f04d6b356c690dcfc38ee7fb5fe6366d8504725ea7a2f8a0a", "b13d1b8298985c0fd2814ee687a70276efdd7b74a0db107c12d262db25c22e23"]
 zipp = ["8c1019c6aad13642199fbe458275ad6a84907634cc9f0989877ccc4a2840139d", "ca943a7e809cc12257001ccfb99e3563da9af99d52f261725e96dfe0f9275bc3"]