diff --git a/poetry.lock b/poetry.lock
index 34d75b9e..8b344fce 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -390,14 +390,14 @@ files = [
 
 [[package]]
 name = "docutils"
-version = "0.18.1"
+version = "0.17.1"
 description = "Docutils -- Python Documentation Utilities"
 category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 files = [
-    {file = "docutils-0.18.1-py2.py3-none-any.whl", hash = "sha256:23010f129180089fbcd3bc08cfefccb3b890b0050e1ca00c867036e9d161b98c"},
-    {file = "docutils-0.18.1.tar.gz", hash = "sha256:679987caf361a7539d76e584cbeddc311e3aee937877c87346f31debc63e9d06"},
+    {file = "docutils-0.17.1-py2.py3-none-any.whl", hash = "sha256:cf316c8370a737a022b72b56874f6602acf974a37a9fba42ec2876387549fc61"},
+    {file = "docutils-0.17.1.tar.gz", hash = "sha256:686577d2e4c32380bb50cbb22f575ed742d58168cee37e99117a854bcd88f125"},
 ]
 
 [[package]]
@@ -1262,21 +1262,21 @@ files = [
 
 [[package]]
 name = "sphinx"
-version = "3.5.3"
+version = "4.3.2"
 description = "Python documentation generator"
 category = "main"
 optional = true
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 files = [
-    {file = "Sphinx-3.5.3-py3-none-any.whl", hash = "sha256:3f01732296465648da43dec8fb40dc451ba79eb3e2cc5c6d79005fd98197107d"},
-    {file = "Sphinx-3.5.3.tar.gz", hash = "sha256:ce9c228456131bab09a3d7d10ae58474de562a6f79abb3dc811ae401cf8c1abc"},
+    {file = "Sphinx-4.3.2-py3-none-any.whl", hash = "sha256:6a11ea5dd0bdb197f9c2abc2e0ce73e01340464feaece525e64036546d24c851"},
+    {file = "Sphinx-4.3.2.tar.gz", hash = "sha256:0a8836751a68306b3fe97ecbe44db786f8479c3bf4b80e3a7f5c838657b4698c"},
 ]
 
 [package.dependencies]
 alabaster = ">=0.7,<0.8"
 babel = ">=1.3"
 colorama = {version = ">=0.3.5", markers = "sys_platform == \"win32\""}
-docutils = ">=0.12"
+docutils = ">=0.14,<0.18"
 imagesize = "*"
 Jinja2 = ">=2.3"
 packaging = "*"
@@ -1286,41 +1286,6 @@ setuptools = "*"
 snowballstemmer = ">=1.1"
 sphinxcontrib-applehelp = "*"
 sphinxcontrib-devhelp = "*"
-sphinxcontrib-htmlhelp = "*"
-sphinxcontrib-jsmath = "*"
-sphinxcontrib-qthelp = "*"
-sphinxcontrib-serializinghtml = "*"
-
-[package.extras]
-docs = ["sphinxcontrib-websupport"]
-lint = ["docutils-stubs", "flake8 (>=3.5.0)", "isort", "mypy (>=0.800)"]
-test = ["cython", "html5lib", "pytest", "pytest-cov", "typed-ast"]
-
-[[package]]
-name = "sphinx"
-version = "6.1.3"
-description = "Python documentation generator"
-category = "main"
-optional = true
-python-versions = ">=3.8"
-files = [
-    {file = "Sphinx-6.1.3.tar.gz", hash = "sha256:0dac3b698538ffef41716cf97ba26c1c7788dba73ce6f150c1ff5b4720786dd2"},
-    {file = "sphinx-6.1.3-py3-none-any.whl", hash = "sha256:807d1cb3d6be87eb78a381c3e70ebd8d346b9a25f3753e9947e866b2786865fc"},
-]
-
-[package.dependencies]
-alabaster = ">=0.7,<0.8"
-babel = ">=2.9"
-colorama = {version = ">=0.4.5", markers = "sys_platform == \"win32\""}
-docutils = ">=0.18,<0.20"
-imagesize = ">=1.3"
-Jinja2 = ">=3.0"
-packaging = ">=21.0"
-Pygments = ">=2.13"
-requests = ">=2.25.0"
-snowballstemmer = ">=2.0"
-sphinxcontrib-applehelp = "*"
-sphinxcontrib-devhelp = "*"
 sphinxcontrib-htmlhelp = ">=2.0.0"
 sphinxcontrib-jsmath = "*"
 sphinxcontrib-qthelp = "*"
@@ -1328,8 +1293,8 @@ sphinxcontrib-serializinghtml = ">=1.1.5"
 
 [package.extras]
 docs = ["sphinxcontrib-websupport"]
-lint = ["docutils-stubs", "flake8 (>=3.5.0)", "flake8-simplify", "isort", "mypy (>=0.990)", "ruff", "sphinx-lint", "types-requests"]
-test = ["cython", "html5lib", "pytest (>=4.6)"]
+lint = ["docutils-stubs", "flake8 (>=3.5.0)", "isort", "mypy (>=0.920)", "types-pkg-resources", "types-requests", "types-typed-ast"]
+test = ["cython", "html5lib", "pytest", "pytest-cov", "typed-ast"]
 
 [[package]]
 name = "sphinx-rtd-theme"
@@ -1367,22 +1332,6 @@ files = [
 lint = ["docutils-stubs", "flake8", "mypy"]
 test = ["pytest"]
 
-[[package]]
-name = "sphinxcontrib-applehelp"
-version = "1.0.4"
-description = "sphinxcontrib-applehelp is a Sphinx extension which outputs Apple help books"
-category = "main"
-optional = true
-python-versions = ">=3.8"
-files = [
-    {file = "sphinxcontrib-applehelp-1.0.4.tar.gz", hash = "sha256:828f867945bbe39817c210a1abfd1bc4895c8b73fcaade56d45357a348a07d7e"},
-    {file = "sphinxcontrib_applehelp-1.0.4-py3-none-any.whl", hash = "sha256:29d341f67fb0f6f586b23ad80e072c8e6ad0b48417db2bde114a4c9746feb228"},
-]
-
-[package.extras]
-lint = ["docutils-stubs", "flake8", "mypy"]
-test = ["pytest"]
-
 [[package]]
 name = "sphinxcontrib-devhelp"
 version = "1.0.2"
@@ -1415,22 +1364,6 @@ files = [
 lint = ["docutils-stubs", "flake8", "mypy"]
 test = ["html5lib", "pytest"]
 
-[[package]]
-name = "sphinxcontrib-htmlhelp"
-version = "2.0.1"
-description = "sphinxcontrib-htmlhelp is a sphinx extension which renders HTML help files"
-category = "main"
-optional = true
-python-versions = ">=3.8"
-files = [
-    {file = "sphinxcontrib-htmlhelp-2.0.1.tar.gz", hash = "sha256:0cbdd302815330058422b98a113195c9249825d681e18f11e8b1f78a2f11efff"},
-    {file = "sphinxcontrib_htmlhelp-2.0.1-py3-none-any.whl", hash = "sha256:c38cb46dccf316c79de6e5515e1770414b797162b23cd3d06e67020e1d2a6903"},
-]
-
-[package.extras]
-lint = ["docutils-stubs", "flake8", "mypy"]
-test = ["html5lib", "pytest"]
-
 [[package]]
 name = "sphinxcontrib-jquery"
 version = "2.0.0"
@@ -1735,9 +1668,9 @@ docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker
 testing = ["big-O", "flake8 (<5)", "jaraco.functools", "jaraco.itertools", "more-itertools", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)"]
 
 [extras]
-docs = ["sphinx", "sphinx", "sphinx-rtd-theme"]
+docs = ["sphinx", "sphinx-rtd-theme"]
 
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.7"
-content-hash = "256e744d00f1295204ba112fe7d746327bdfc4e3bb0d4a8c415eb08eabc27f1f"
+content-hash = "8a990fa52c9ff1e046b0716bfcc8ebb77a1f80cfcab540e63cfd01bd3ee90b71"
diff --git a/pyproject.toml b/pyproject.toml
index c6fe644b..27f1c41c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,21 +45,16 @@ pyopenssl = ">=0.13"
 # For pkg_resources. >=1.0 so pip resolves it to a version cryptography
 # will tolerate; see #2599:
 setuptools = ">=1.0"
-# Our sphinx dependency is currently specified in this way to avoid making our
-# version requirement overly strict for people on older versions of Python.
-sphinx = [
-    # >=1.0 is needed for autodoc_member_order = 'bysource', autodoc_default_flags
-    {version = ">=1.0", optional = true},
-    # >=4.2.0 is needed for Python 3.10 support. See
-    # https://github.com/sphinx-doc/sphinx/issues/9816.
-    {version = ">=4.2.0", optional = true, python = ">=3.10"}
-]
+# >=4.3.0 is needed for Python 3.10 support
+sphinx = {version = ">=4.3.0", optional = true}
 sphinx-rtd-theme = {version = ">=1.0", optional = true}
 
 [tool.poetry.dev-dependencies]
 # coverage[toml] extra is required to read the coverage config from pyproject.toml
 coverage = {version = ">=4.0", extras = ["toml"]}
-flake8 = "*"
+# flake8 3.x doesn't work on Python 3.7. See
+# https://github.com/PyCQA/flake8/issues/1701.
+flake8 = ">=4.0"
 flake8-assertive = "*"
 isort = "*"
 mypy = "*"