diff --git a/docs/requirements.txt b/docs/requirements.txt
index b21ffd01..2a6fa9fb 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -84,7 +84,7 @@ sphinxcontrib-applehelp==1.0.7
     # via sphinx
 sphinxcontrib-devhelp==1.0.5
     # via sphinx
-sphinxcontrib-htmlhelp==2.0.4
+sphinxcontrib-htmlhelp==2.0.6
     # via sphinx
 sphinxcontrib-jquery==4.1
     # via sphinx-rtd-theme