diff --git a/noxfile.py b/noxfile.py
index b2b434e..d4be9fc 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -141,7 +141,7 @@ def docs(session: Session) -> None:
     session.run("rm", "-rf", output_dir, external=True)
 
     nox_poetry.install(session, nox_poetry.WHEEL)
-    nox_poetry.install(session, "sphinx", "sphinx-autobuild")
+    nox_poetry.install(session, "sphinx", "sphinx-autobuild", "sphinx-rtd-theme")
     session.cd("docs")
     sphinx_args = [
         "-b",
diff --git a/poetry.lock b/poetry.lock
index 106923e..47f117b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -798,6 +798,20 @@ test = ["pytest", "pytest-cov"]
 livereload = "*"
 sphinx = "*"
 
+[[package]]
+name = "sphinx-rtd-theme"
+version = "0.5.0"
+description = "Read the Docs theme for Sphinx"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.extras]
+dev = ["transifex-client", "sphinxcontrib-httpdomain", "bump2version"]
+
+[package.dependencies]
+sphinx = "*"
+
 [[package]]
 name = "sphinxcontrib-applehelp"
 version = "1.0.2"
@@ -972,7 +986,7 @@ testing = ["pytest (>=3.5,<3.7.3 || >3.7.3)", "pytest-checkdocs (>=1.2.3)", "pyt
 [metadata]
 lock-version = "1.0"
 python-versions = "^3.6.1"
-content-hash = "d42a9e4480b364cd2fcc929659360b991f7e69c575d6a5a1b73be71729b9c714"
+content-hash = "ab267246dee02c781accfe100d67fc3931792b537483bfa71d2aaa1f469353ad"
 
 [metadata.files]
 alabaster = [
@@ -1365,6 +1379,10 @@ sphinx-autobuild = [
     {file = "sphinx-autobuild-2020.9.1.tar.gz", hash = "sha256:4b184a7db893f2100bbd831991ae54ca89167a2b9ce68faea71eaa9e37716aed"},
     {file = "sphinx_autobuild-2020.9.1-py3-none-any.whl", hash = "sha256:df5c72cb8b8fc9b31279c4619780c4e95029be6de569ff60a8bb2e99d20f63dd"},
 ]
+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"},
+]
 sphinxcontrib-applehelp = [
     {file = "sphinxcontrib-applehelp-1.0.2.tar.gz", hash = "sha256:a072735ec80e7675e3f432fcae8610ecf509c5f1869d17e2eecff44389cdbc58"},
     {file = "sphinxcontrib_applehelp-1.0.2-py2.py3-none-any.whl", hash = "sha256:806111e5e962be97c29ec4c1e7fe277bfd19e9652fb1a4392105b43e01af885a"},
diff --git a/pyproject.toml b/pyproject.toml
index eece96b..e21c045 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,6 +42,7 @@ reorder-python-imports = "^2.3.5"
 darglint = "^1.5.5"
 sphinx = "^3.2.1"
 sphinx-autobuild = "^2020.9.1"
+sphinx-rtd-theme = "^0.5.0"
 
 [tool.coverage.paths]
 source = ["src", "*/site-packages"]