diff --git a/poetry.lock b/poetry.lock
index 2ebd9897b..3c7a0ee9e 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1072,13 +1072,13 @@ description = "Python documentation generator"
 name = "sphinx"
 optional = false
 python-versions = ">=3.5"
-version = "2.4.4"
+version = "3.0.0"
 
 [package.dependencies]
 Jinja2 = ">=2.3"
 Pygments = ">=2.0"
 alabaster = ">=0.7,<0.8"
-babel = ">=1.3,<2.0 || >2.0"
+babel = ">=1.3"
 colorama = ">=0.3.5"
 docutils = ">=0.12"
 imagesize = "*"
@@ -1095,7 +1095,8 @@ sphinxcontrib-serializinghtml = "*"
 
 [package.extras]
 docs = ["sphinxcontrib-websupport"]
-test = ["pytest (<5.3.3)", "pytest-cov", "html5lib", "flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.761)", "docutils-stubs"]
+lint = ["flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.770)", "docutils-stubs"]
+test = ["pytest", "pytest-cov", "html5lib", "typed-ast", "cython"]
 
 [[package]]
 category = "dev"
@@ -1335,7 +1336,7 @@ docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["jaraco.itertools"]
 
 [metadata]
-content-hash = "8bab9987b5b9ba4b5fd214f3dc1f391d1634fd29b59041bd44ec5290354a19ed"
+content-hash = "fb2325ac07239e3a13a26993ca312362ae13d16d1f5cc06cae4e39ca26215712"
 python-versions = "^3.6"
 
 [metadata.files]
@@ -1796,8 +1797,8 @@ sortedcontainers = [
     {file = "sortedcontainers-2.1.0.tar.gz", hash = "sha256:974e9a32f56b17c1bac2aebd9dcf197f3eb9cd30553c5852a3187ad162e1a03a"},
 ]
 sphinx = [
-    {file = "Sphinx-2.4.4-py3-none-any.whl", hash = "sha256:fc312670b56cb54920d6cc2ced455a22a547910de10b3142276495ced49231cb"},
-    {file = "Sphinx-2.4.4.tar.gz", hash = "sha256:b4c750d546ab6d7e05bdff6ac24db8ae3e8b8253a3569b754e445110a0a12b66"},
+    {file = "Sphinx-3.0.0-py3-none-any.whl", hash = "sha256:b63a0c879c4ff9a4dffcb05217fa55672ce07abdeb81e33c73303a563f8d8901"},
+    {file = "Sphinx-3.0.0.tar.gz", hash = "sha256:6a099e6faffdc3ceba99ca8c2d09982d43022245e409249375edf111caf79ed3"},
 ]
 sphinx-autodoc-typehints = [
     {file = "sphinx-autodoc-typehints-1.10.3.tar.gz", hash = "sha256:a6b3180167479aca2c4d1ed3b5cb044a70a76cccd6b38662d39288ebd9f0dff0"},
diff --git a/pyproject.toml b/pyproject.toml
index 5164d80ab..e619263da 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,7 +62,7 @@ pytest-randomly = "^3.2"
 pytest-asyncio = "^0.10.0"
 pytest-mypy-plugins = "^1.2"
 
-sphinx = "^2.4"
+sphinx = "^3.0"
 sphinx-autodoc-typehints = "^1.10"
 sphinxcontrib-mermaid = "^0.3.1"
 sphinx-typlog-theme = "^0.8.0"