diff --git a/requirements.txt b/requirements.txt
index ac4996e7b..6054364db 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ sphinx-rtd-theme==2.0.0
 sphinx-rtd-dark-mode==1.3.0
 sphinxcontrib-applehelp==2.0.0
 sphinxcontrib-devhelp==1.0.6
-sphinxcontrib-htmlhelp==2.0.5
+sphinxcontrib-htmlhelp==2.1.0
 sphinxcontrib-jquery==4.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-phpdomain==0.12.0