diff --git a/poetry.lock b/poetry.lock
index 6775890b..e1e3ba55 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -751,7 +751,7 @@ python-versions = "*"
 
 [[package]]
 name = "sphinx"
-version = "3.3.1"
+version = "3.5.2"
 description = "Python documentation generator"
 category = "dev"
 optional = false
@@ -777,8 +777,8 @@ sphinxcontrib-serializinghtml = "*"
 
 [package.extras]
 docs = ["sphinxcontrib-websupport"]
-lint = ["flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.790)", "docutils-stubs"]
-test = ["pytest", "pytest-cov", "html5lib", "typed-ast", "cython"]
+lint = ["flake8 (>=3.5.0)", "isort", "mypy (>=0.800)", "docutils-stubs"]
+test = ["pytest", "pytest-cov", "html5lib", "cython", "typed-ast"]
 
 [[package]]
 name = "sphinx-autobuild"
@@ -1016,7 +1016,7 @@ testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6.1"
-content-hash = "5f70ac9f1a430f81f128d8107f03c869cd31df2cfcb27ce749fa2c4ea779ceff"
+content-hash = "ae92f8da94977f4c3460d6171d6e34bb19f93eb6e5b9c2abccffb2249004ae4f"
 
 [metadata.files]
 alabaster = [
@@ -1492,8 +1492,8 @@ snowballstemmer = [
     {file = "snowballstemmer-2.0.0.tar.gz", hash = "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"},
 ]
 sphinx = [
-    {file = "Sphinx-3.3.1-py3-none-any.whl", hash = "sha256:d4e59ad4ea55efbb3c05cde3bfc83bfc14f0c95aa95c3d75346fcce186a47960"},
-    {file = "Sphinx-3.3.1.tar.gz", hash = "sha256:1e8d592225447104d1172be415bc2972bd1357e3e12fdc76edf2261105db4300"},
+    {file = "Sphinx-3.5.2-py3-none-any.whl", hash = "sha256:ef64a814576f46ec7de06adf11b433a0d6049be007fefe7fd0d183d28b581fac"},
+    {file = "Sphinx-3.5.2.tar.gz", hash = "sha256:672cfcc24b6b69235c97c750cb190a44ecd72696b4452acaf75c2d9cc78ca5ff"},
 ]
 sphinx-autobuild = [
     {file = "sphinx-autobuild-2020.9.1.tar.gz", hash = "sha256:4b184a7db893f2100bbd831991ae54ca89167a2b9ce68faea71eaa9e37716aed"},
diff --git a/pyproject.toml b/pyproject.toml
index 210d63ef..1d0fac57 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ safety = "^1.10.3"
 mypy = "^0.790"
 typeguard = "^2.10.0"
 xdoctest = {extras = ["colors"], version = "^0.15.0"}
-sphinx = "^3.3.1"
+sphinx = "^3.5.2"
 sphinx-autobuild = "^2020.9.1"
 pre-commit = "^2.11.1"
 flake8 = "^3.8.4"