diff --git a/poetry.lock b/poetry.lock
index e16f213..5bbde0b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -535,13 +535,14 @@ test = ["pytest", "pytest-cov", "html5lib", "typed-ast", "cython"]
 
 [[package]]
 name = "sphinx-rtd-theme"
-version = "0.5.0"
+version = "0.5.2"
 description = "Read the Docs theme for Sphinx"
 category = "dev"
 optional = true
 python-versions = "*"
 
 [package.dependencies]
+docutils = "<0.17"
 sphinx = "*"
 
 [package.extras]
@@ -703,7 +704,7 @@ travis-ci = []
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6"
-content-hash = "a18078e1b4a0363f1c0171e88d27f24b80e5a9e8d460836525b282702be6458f"
+content-hash = "401c73848158e398374d7e4988aa179a0eee614a137c0abdee9b363ca35d73e0"
 
 [metadata.files]
 alabaster = [
@@ -988,8 +989,8 @@ sphinx = [
     {file = "Sphinx-3.1.2.tar.gz", hash = "sha256:b9daeb9b39aa1ffefc2809b43604109825300300b987a24f45976c001ba1a8fd"},
 ]
 sphinx-rtd-theme = [
-    {file = "sphinx_rtd_theme-0.5.0-py2.py3-none-any.whl", hash = "sha256:373413d0f82425aaa28fb288009bf0d0964711d347763af2f1b65cafcb028c82"},
-    {file = "sphinx_rtd_theme-0.5.0.tar.gz", hash = "sha256:22c795ba2832a169ca301cd0a083f7a434e09c538c70beb42782c073651b707d"},
+    {file = "sphinx_rtd_theme-0.5.2-py2.py3-none-any.whl", hash = "sha256:4a05bdbe8b1446d77a01e20a23ebc6777c74f43237035e76be89699308987d6f"},
+    {file = "sphinx_rtd_theme-0.5.2.tar.gz", hash = "sha256:32bd3b5d13dc8186d7a42fc816a23d32e83a4827d7d9882948e7b837c232da5a"},
 ]
 sphinxcontrib-applehelp = [
     {file = "sphinxcontrib-applehelp-1.0.1.tar.gz", hash = "sha256:edaa0ab2b2bc74403149cb0209d6775c96de797dfd5b5e2a71981309efab3897"},
diff --git a/pyproject.toml b/pyproject.toml
index 7a5815f..dfa5b4d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ pytest-runner = "^5.3"
 towncrier = {version = "^19.2", optional = true}
 tox = "^3.19"
 sphinx = {version = "^3.1", optional = true}
-sphinx_rtd_theme = {version = "^0.5.0", optional = true}
+sphinx_rtd_theme = {version = "^0.5.2", optional = true}
 pre-commit = {version = "^2.1", optional = true}
 
 [tool.poetry.extras]