diff --git a/docs/requirements.txt b/docs/requirements.txt
index 8f036fe..219d997 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -14,7 +14,7 @@ sphinx-jsonschema==1.19.1
 sphinx-rtd-theme==1.3.0
 sphinxcontrib-applehelp==1.0.4
 sphinxcontrib-devhelp==1.0.2
-sphinxcontrib-htmlhelp==2.0.1
+sphinxcontrib-htmlhelp==2.0.5
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5