diff --git a/requirements.txt b/requirements.txt
index f07575ac1..ea6596f7b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ sphinxcontrib-devhelp==1.0.4
 sphinxcontrib-htmlhelp==2.0.3
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
-sphinxcontrib-serializinghtml==1.1.7
+sphinxcontrib-serializinghtml==1.1.9
 tqdm==4.66.1
 translate-toolkit==3.10.0
 urllib3==1.26.16