diff --git a/requirements.txt b/requirements.txt
index 6d1bd6b..198ca11 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ pytz==2017.2
 requests==2.17.3
 six==1.10.0
 snowballstemmer==1.2.1
-Sphinx==1.6.2
+Sphinx==1.6.4
 sphinx-rtd-theme==0.1.9
 blurb==1.0.4
 sphinxcontrib-websupport==1.0.1