diff --git a/poetry.lock b/poetry.lock
index 129c95fc..d19f7831 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -426,7 +426,7 @@ restructuredtext_lint = "*"
 
 [[package]]
 name = "furo"
-version = "2020.12.30b24"
+version = "2021.2.28b28"
 description = "A clean customisable Sphinx documentation theme."
 category = "dev"
 optional = false
@@ -1114,7 +1114,7 @@ python-versions = ">=3.5"
 
 [[package]]
 name = "sphinx"
-version = "3.4.3"
+version = "3.5.2"
 description = "Python documentation generator"
 category = "dev"
 optional = false
@@ -1140,7 +1140,7 @@ sphinxcontrib-serializinghtml = "*"
 
 [package.extras]
 docs = ["sphinxcontrib-websupport"]
-lint = ["flake8 (>=3.5.0)", "isort", "mypy (>=0.790)", "docutils-stubs"]
+lint = ["flake8 (>=3.5.0)", "isort", "mypy (>=0.800)", "docutils-stubs"]
 test = ["pytest", "pytest-cov", "html5lib", "cython", "typed-ast"]
 
 [[package]]
@@ -1368,7 +1368,7 @@ 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 = "f505d64321c419e123dd6a55c760c5c2adeef72c39266283f4b7aced47190c66"
+content-hash = "b9974e339d962128ad27b81d9b24b74588e529936779817d31c4b8726e4aab98"
 
 [metadata.files]
 alabaster = [
@@ -1613,8 +1613,8 @@ flake8-rst-docstrings = [
     {file = "flake8-rst-docstrings-0.0.14.tar.gz", hash = "sha256:8f8bcb18f1408b506dd8ba2c99af3eac6128f6911d4bf6ff874b94caa70182a2"},
 ]
 furo = [
-    {file = "furo-2020.12.30b24-py3-none-any.whl", hash = "sha256:251dadee4dee96dddf2dc9b5243b88212e16923f53397bf12bc98574918bda41"},
-    {file = "furo-2020.12.30b24.tar.gz", hash = "sha256:30171899c9c06d692a778e6daf6cb2e5cbb05efc6006e1692e5e776007dc8a8c"},
+    {file = "furo-2021.2.28b28-py3-none-any.whl", hash = "sha256:f847b691aded3e5e27950d26c9fd1b72249902b6a3b9aabd29b7ee3701c8f9f8"},
+    {file = "furo-2021.2.28b28.tar.gz", hash = "sha256:8bd588f0e04a00c25de0206d989980b8348d9d329f2795c686a3fe25e769cbb5"},
 ]
 gitdb = [
     {file = "gitdb-4.0.5-py3-none-any.whl", hash = "sha256:91f36bfb1ab7949b3b40e23736db18231bf7593edada2ba5c3a174a7b23657ac"},
@@ -2028,8 +2028,8 @@ soupsieve = [
     {file = "soupsieve-2.0.1.tar.gz", hash = "sha256:a59dc181727e95d25f781f0eb4fd1825ff45590ec8ff49eadfd7f1a537cc0232"},
 ]
 sphinx = [
-    {file = "Sphinx-3.4.3-py3-none-any.whl", hash = "sha256:c314c857e7cd47c856d2c5adff514ac2e6495f8b8e0f886a8a37e9305dfea0d8"},
-    {file = "Sphinx-3.4.3.tar.gz", hash = "sha256:41cad293f954f7d37f803d97eb184158cfd90f51195131e94875bc07cd08b93c"},
+    {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 40e7f0fb..e0d8fa1a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,7 +31,7 @@ safety = "^1.10.3"
 mypy = "^0.812"
 typeguard = "^2.11.1"
 xdoctest = {extras = ["colors"], version = "^0.15.4"}
-sphinx = "^3.4.3"
+sphinx = "^3.5.2"
 sphinx-autobuild = "^2020.9.1"
 pre-commit = "^2.10.0"
 flake8 = "^3.8.4"
@@ -44,7 +44,7 @@ pep8-naming = "^0.11.1"
 darglint = "^1.6.0"
 reorder-python-imports = "^2.4.0"
 pre-commit-hooks = "^3.4.0"
-furo = "^2020.12.30b24"
+furo = "^2021.2.28b28"
 Pygments = "^2.7.4"
 poetry = "^1.1.5"
 pytest-datadir = "^1.3.1"