diff --git a/lower-constraints.txt b/lower-constraints.txt
index 3ce8c19b3b..db1bfc0b9e 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -89,7 +89,7 @@ simplejson==3.13.2
 six==1.10.0
 smmap2==2.0.3
 snowballstemmer==1.2.1
-Sphinx==1.6.2
+Sphinx==1.8.0
 sphinxcontrib-websupport==1.0.1
 sphinxcontrib-svg2pdfconverter==0.1.0
 stevedore==1.28.0