diff --git a/pyproject.toml b/pyproject.toml
index 53f4ebf..80a199d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ flake8 = ">=3.6.0"
 mock = "^3.0.5"
 bumpversion = "^0.5.0"
 sphinx = ">=1.8.4"
-sphinx-rtd-theme = "^0.4.0"
+sphinx-rtd-theme = "^0.5.0"
 
 [build-system]
 requires = ["poetry-core>=1.0.0a6"]