diff --git a/doc/requirements.txt b/doc/requirements.txt
index 1668b007..051c01d0 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,2 +1,2 @@
-Sphinx==1.8.4
+Sphinx==1.8.5
 sphinx-autoapi==0.7.1