diff --git a/doc/requirements.txt b/doc/requirements.txt
index b4ca730..5545408 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,5 +1,5 @@
 sphinx-rtd-theme==2.0.0
-sphinxcontrib-applehelp==1.0.4
+sphinxcontrib-applehelp==1.0.7
 sphinxcontrib-devhelp==1.0.5
 sphinxcontrib-htmlhelp==2.0.4
 sphinxcontrib-jquery==4.1