diff --git a/requirements_dev.txt b/requirements_dev.txt
index c7d5a5c..2396dc9 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,5 +3,5 @@ watchdog==0.8.3
 flake8==3.3.0
 tox==2.7.0
 coverage==4.3.4
-Sphinx==1.5.5
+Sphinx==1.6.6
 pytest==3.0.7