diff --git a/docs/requirements.txt b/docs/requirements.txt
index dfd9bd52..50430ba9 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,7 +4,7 @@ sphinx-autodoc-typehints==1.23.0
 sphinx-rtd-theme==2.0.0
 sphinxcontrib-applehelp==1.0.8
 sphinxcontrib-devhelp==1.0.6
-sphinxcontrib-htmlhelp==2.0.4
+sphinxcontrib-htmlhelp==2.1.0
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-programoutput==0.17
 sphinxcontrib-qthelp==1.0.7