diff --git a/poetry.lock b/poetry.lock
index caa01f38..64f6ce45 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -80,16 +80,16 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "flake8"
-version = "3.9.2"
+version = "4.0.0"
 description = "the modular source code checker: pep8 pyflakes and co"
 category = "dev"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+python-versions = ">=3.6"
 
 [package.dependencies]
 mccabe = ">=0.6.0,<0.7.0"
-pycodestyle = ">=2.7.0,<2.8.0"
-pyflakes = ">=2.3.0,<2.4.0"
+pycodestyle = ">=2.8.0,<2.9.0"
+pyflakes = ">=2.4.0,<2.5.0"
 
 [[package]]
 name = "flake8-polyfill"
@@ -114,7 +114,7 @@ python-versions = "*"
 python-dateutil = ">=2.8.1"
 
 [package.extras]
-dev = ["twine", "markdown", "flake8"]
+dev = ["twine", "markdown", "flake8", "wheel"]
 
 [[package]]
 name = "gitdb"
@@ -370,15 +370,15 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pycodestyle"
-version = "2.7.0"
+version = "2.8.0"
 description = "Python style guide checker"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "pyflakes"
-version = "2.3.1"
+version = "2.4.0"
 description = "passive checker of Python programs"
 category = "dev"
 optional = false
@@ -555,7 +555,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytes
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.9"
-content-hash = "3a91ce1ade88e7c35478f4c1359e5494f959f91877f8ae437b2bdbc941866e04"
+content-hash = "47596a8707bb3c76bcc7589c92d90d0312ec717fc773d77b00ff8257a4c06a41"
 
 [metadata.files]
 atomicwrites = [
@@ -583,8 +583,8 @@ colorama = [
     {file = "colorama-0.4.4.tar.gz", hash = "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b"},
 ]
 flake8 = [
-    {file = "flake8-3.9.2-py2.py3-none-any.whl", hash = "sha256:bf8fd333346d844f616e8d47905ef3a3384edae6b4e9beb0c5101e25e3110907"},
-    {file = "flake8-3.9.2.tar.gz", hash = "sha256:07528381786f2a6237b061f6e96610a4167b226cb926e2aa2b6b1d78057c576b"},
+    {file = "flake8-4.0.0-py2.py3-none-any.whl", hash = "sha256:124554bfd067e04d891258c0208a764b512ca3a94c8a3c06bea56af539dd74db"},
+    {file = "flake8-4.0.0.tar.gz", hash = "sha256:b52d27e627676b015340c3b1c72bc9259a6cacc9341712fb8f01ddfaaa2c651a"},
 ]
 flake8-polyfill = [
     {file = "flake8-polyfill-1.0.2.tar.gz", hash = "sha256:e44b087597f6da52ec6393a709e7108b2905317d0c0b744cdca6208e670d8eda"},
@@ -592,6 +592,7 @@ flake8-polyfill = [
 ]
 ghp-import = [
     {file = "ghp-import-2.0.1.tar.gz", hash = "sha256:753de2eace6e0f7d4edfb3cce5e3c3b98cd52aadb80163303d1d036bda7b4483"},
+    {file = "ghp_import-2.0.1-py3-none-any.whl", hash = "sha256:8241a8e9f8dd3c1fafe9696e6e081b57a208ef907e9939c44e7415e407ab40ea"},
 ]
 gitdb = [
     {file = "gitdb-4.0.5-py3-none-any.whl", hash = "sha256:91f36bfb1ab7949b3b40e23736db18231bf7593edada2ba5c3a174a7b23657ac"},
@@ -733,12 +734,12 @@ py = [
     {file = "py-1.10.0.tar.gz", hash = "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3"},
 ]
 pycodestyle = [
-    {file = "pycodestyle-2.7.0-py2.py3-none-any.whl", hash = "sha256:514f76d918fcc0b55c6680472f0a37970994e07bbb80725808c17089be302068"},
-    {file = "pycodestyle-2.7.0.tar.gz", hash = "sha256:c389c1d06bf7904078ca03399a4816f974a1d590090fecea0c63ec26ebaf1cef"},
+    {file = "pycodestyle-2.8.0-py2.py3-none-any.whl", hash = "sha256:720f8b39dde8b293825e7ff02c475f3077124006db4f440dcbc9a20b76548a20"},
+    {file = "pycodestyle-2.8.0.tar.gz", hash = "sha256:eddd5847ef438ea1c7870ca7eb78a9d47ce0cdb4851a5523949f2601d0cbbe7f"},
 ]
 pyflakes = [
-    {file = "pyflakes-2.3.1-py2.py3-none-any.whl", hash = "sha256:7893783d01b8a89811dd72d7dfd4d84ff098e5eed95cfa8905b22bbffe52efc3"},
-    {file = "pyflakes-2.3.1.tar.gz", hash = "sha256:f5bc8ecabc05bb9d291eb5203d6810b49040f6ff446a756326104746cc00c1db"},
+    {file = "pyflakes-2.4.0-py2.py3-none-any.whl", hash = "sha256:3bb3a3f256f4b7968c9c788781e4ff07dce46bdf12339dcda61053375426ee2e"},
+    {file = "pyflakes-2.4.0.tar.gz", hash = "sha256:05a85c2872edf37a4ed30b0cce2f6093e1d0581f8c19d7393122da7e25b2b24c"},
 ]
 pygments = [
     {file = "Pygments-2.7.3-py3-none-any.whl", hash = "sha256:f275b6c0909e5dafd2d6269a656aa90fa58ebf4a74f8fcf9053195d226b24a08"},
diff --git a/pyproject.toml b/pyproject.toml
index 8a4f804c..4314870e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ mkdocs-material = "^7.2.8"
 [tool.poetry.dev-dependencies]
 black = "^21.9b0"
 codespell = "^2.1.0"
-flake8 = "^3.9.2"
+flake8 = "^4.0.0"
 pep8-naming = "^0.12.1"
 
 [tool.black]