diff --git a/poetry.lock b/poetry.lock
index 7b19ed9..acfed9d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -766,17 +766,17 @@ python-versions = "*"
 
 [[package]]
 name = "sphinx"
-version = "3.5.4"
+version = "4.0.2"
 description = "Python documentation generator"
 category = "dev"
 optional = false
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 
 [package.dependencies]
 alabaster = ">=0.7,<0.8"
 babel = ">=1.3"
 colorama = {version = ">=0.3.5", markers = "sys_platform == \"win32\""}
-docutils = ">=0.12,<0.17"
+docutils = ">=0.14,<0.18"
 imagesize = "*"
 Jinja2 = ">=2.3"
 packaging = "*"
@@ -1025,7 +1025,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pyt
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "2caff1e8dc4192c10c6958e7b56fb03a2b2674e0c1eed51c1138cd00d1161fb2"
+content-hash = "00e336da7f18c845e65ebf6d2e971feedfda65c59e3b3b0a636ae4a26dddc37c"
 
 [metadata.files]
 alabaster = [
@@ -1490,8 +1490,8 @@ snowballstemmer = [
     {file = "snowballstemmer-2.1.0.tar.gz", hash = "sha256:e997baa4f2e9139951b6f4c631bad912dfd3c792467e2f03d7239464af90e914"},
 ]
 sphinx = [
-    {file = "Sphinx-3.5.4-py3-none-any.whl", hash = "sha256:2320d4e994a191f4b4be27da514e46b3d6b420f2ff895d064f52415d342461e8"},
-    {file = "Sphinx-3.5.4.tar.gz", hash = "sha256:19010b7b9fa0dc7756a6e105b2aacd3a80f798af3c25c273be64d7beeb482cb1"},
+    {file = "Sphinx-4.0.2-py3-none-any.whl", hash = "sha256:d1cb10bee9c4231f1700ec2e24a91be3f3a3aba066ea4ca9f3bbe47e59d5a1d4"},
+    {file = "Sphinx-4.0.2.tar.gz", hash = "sha256:b5c2ae4120bf00c799ba9b3699bc895816d272d120080fbc967292f29b52b48c"},
 ]
 sphinx-autobuild = [
     {file = "sphinx-autobuild-2020.9.1.tar.gz", hash = "sha256:4b184a7db893f2100bbd831991ae54ca89167a2b9ce68faea71eaa9e37716aed"},
diff --git a/pyproject.toml b/pyproject.toml
index 75625be..7f2060f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,7 +45,7 @@ coverage = {extras = ["toml"], version = "^5.3"}
 pytest-django = "^4.1.0"
 pygments = "^2.7.4"
 xdoctest = "^0.15.0"
-sphinx = "^3.4.3"
+sphinx = "^4.0.2"
 sphinx-autobuild = "^2020.9.1"
 darglint = "^1.5.8"
 flake8-docstrings = "^1.5.0"