diff --git a/poetry.lock b/poetry.lock
index 1884039..88d1a35 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -239,17 +239,17 @@ python-versions = "*"
 
 [[package]]
 name = "flake8"
-version = "3.8.4"
+version = "3.9.2"
 description = "the modular source code checker: pep8 pyflakes and co"
 category = "dev"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 
 [package.dependencies]
 importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 mccabe = ">=0.6.0,<0.7.0"
-pycodestyle = ">=2.6.0a1,<2.7.0"
-pyflakes = ">=2.2.0,<2.3.0"
+pycodestyle = ">=2.7.0,<2.8.0"
+pyflakes = ">=2.3.0,<2.4.0"
 
 [[package]]
 name = "future"
@@ -483,7 +483,7 @@ pyasn1 = ">=0.4.6,<0.5.0"
 
 [[package]]
 name = "pycodestyle"
-version = "2.6.0"
+version = "2.7.0"
 description = "Python style guide checker"
 category = "dev"
 optional = false
@@ -499,7 +499,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pyflakes"
-version = "2.2.0"
+version = "2.3.1"
 description = "passive checker of Python programs"
 category = "dev"
 optional = false
@@ -919,7 +919,7 @@ testing = ["coverage", "nose", "zope.event"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6, <3.8"
-content-hash = "0ba537766ba019ceef02618f701c9d4c60ef2b2c6c5e56780be846597f1f9fdb"
+content-hash = "ca04f101c72bcf0eee95969000b9a09130450dad8c505c04b80693649d11c9cd"
 
 [metadata.files]
 altgraph = [
@@ -1078,8 +1078,8 @@ filelock = [
     {file = "filelock-3.0.12.tar.gz", hash = "sha256:18d82244ee114f543149c66a6e0c14e9c4f8a1044b5cdaadd0f82159d6a6ff59"},
 ]
 flake8 = [
-    {file = "flake8-3.8.4-py2.py3-none-any.whl", hash = "sha256:749dbbd6bfd0cf1318af27bf97a14e28e5ff548ef8e5b1566ccfb25a11e7c839"},
-    {file = "flake8-3.8.4.tar.gz", hash = "sha256:aadae8761ec651813c24be05c6f7b4680857ef6afaae4651a4eccaef97ce6c3b"},
+    {file = "flake8-3.9.2-py2.py3-none-any.whl", hash = "sha256:bf8fd333346d844f616e8d47905ef3a3384edae6b4e9beb0c5101e25e3110907"},
+    {file = "flake8-3.9.2.tar.gz", hash = "sha256:07528381786f2a6237b061f6e96610a4167b226cb926e2aa2b6b1d78057c576b"},
 ]
 future = [
     {file = "future-0.18.2.tar.gz", hash = "sha256:b1bead90b70cf6ec3f0710ae53a525360fa360d306a86583adc6bf83a4db537d"},
@@ -1207,15 +1207,15 @@ pyasn1-modules = [
     {file = "pyasn1_modules-0.2.8-py3.7.egg", hash = "sha256:c29a5e5cc7a3f05926aff34e097e84f8589cd790ce0ed41b67aed6857b26aafd"},
 ]
 pycodestyle = [
-    {file = "pycodestyle-2.6.0-py2.py3-none-any.whl", hash = "sha256:2295e7b2f6b5bd100585ebcb1f616591b652db8a741695b3d8f5d28bdc934367"},
-    {file = "pycodestyle-2.6.0.tar.gz", hash = "sha256:c58a7d2815e0e8d7972bf1803331fb0152f867bd89adf8a01dfd55085434192e"},
+    {file = "pycodestyle-2.7.0-py2.py3-none-any.whl", hash = "sha256:514f76d918fcc0b55c6680472f0a37970994e07bbb80725808c17089be302068"},
+    {file = "pycodestyle-2.7.0.tar.gz", hash = "sha256:c389c1d06bf7904078ca03399a4816f974a1d590090fecea0c63ec26ebaf1cef"},
 ]
 pycparser = [
     {file = "pycparser-2.19.tar.gz", hash = "sha256:a988718abfad80b6b157acce7bf130a30876d27603738ac39f140993246b25b3"},
 ]
 pyflakes = [
-    {file = "pyflakes-2.2.0-py2.py3-none-any.whl", hash = "sha256:0d94e0e05a19e57a99444b6ddcf9a6eb2e5c68d3ca1e98e90707af8152c90a92"},
-    {file = "pyflakes-2.2.0.tar.gz", hash = "sha256:35b2d75ee967ea93b55750aa9edbbf72813e06a66ba54438df2cfac9e3c27fc8"},
+    {file = "pyflakes-2.3.1-py2.py3-none-any.whl", hash = "sha256:7893783d01b8a89811dd72d7dfd4d84ff098e5eed95cfa8905b22bbffe52efc3"},
+    {file = "pyflakes-2.3.1.tar.gz", hash = "sha256:f5bc8ecabc05bb9d291eb5203d6810b49040f6ff446a756326104746cc00c1db"},
 ]
 pyhamcrest = [
     {file = "PyHamcrest-2.0.0-py3-none-any.whl", hash = "sha256:36cda5e849e3ee9ce54628667471e5e769f596259bb3c13c3596f6059a615ef8"},
diff --git a/pyproject.toml b/pyproject.toml
index 017cf4e..2a7d939 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ macholib = { version = "^1.13", platform = "darwin" }
 dmgbuild = { version = "^1.3.3", platform = "darwin" }
 
 black = { version = "^20.8b1", python = "^3.6" }
-flake8 = "^3.8.4"
+flake8 = "^3.9.2"
 tox = "^3.20.1"
 
 [build-system]