diff --git a/requirements.txt b/requirements.txt
index 8693c3c..48a08b4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ sphinx-markdown-tables==0.0.17
 sphinx-rtd-theme>=1.2.0
 sphinxcontrib-applehelp==1.0.2
 sphinxcontrib-devhelp==1.0.5
-sphinxcontrib-htmlhelp==2.0.0
+sphinxcontrib-htmlhelp==2.0.5
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml>=1.1.9