diff --git a/user_guide_src/requirements.txt b/user_guide_src/requirements.txt
index c1b52845bab9..c5545dd700a7 100644
--- a/user_guide_src/requirements.txt
+++ b/user_guide_src/requirements.txt
@@ -1,5 +1,6 @@
 sphinx>=4.5.0,<5
 sphinxcontrib-phpdomain>=0.8.0
+sphinxcontrib-applehelp>=1.0.4,<1.0.8
 docutils>=0.16
 sphinx-rtd-theme>=0.5.0
 jinja2<3.1