diff --git a/pyproject.toml b/pyproject.toml
index bce1708f..8c076f73 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,6 @@ pytest-cov = "2.6.1"
 pytest-mock = "1.10.0"
 sphinx = "1.8.3"
 sphinx-autobuild = "0.7.1"
-sphinx-rtd-theme = "0.4.2"
+sphinx-rtd-theme = "0.4.3"
 sphinxcontrib-httpdomain = "1.6.1"
 sphinxcontrib-websupport = "1.1.0"