diff --git a/docs/requirements.txt b/docs/requirements.txt
index 51c14f0a..ca284467 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -16,7 +16,7 @@ sphinxcontrib-applehelp==2.0.0
 sphinx_design==0.6.1
 sphinxcontrib-details-directive==0.1.0
 sphinxcontrib-devhelp==2.0.0
-sphinxcontrib-htmlhelp==2.0.5
+sphinxcontrib-htmlhelp==2.1.0
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.8
 sphinxext-opengraph==0.9.1